Recent advances in solar photovoltaic systems for emerging trends and advanced applications

Abstract

This communication presents a comprehensive review on the solar photovoltaic (SPV) systems for recent advances and their emerging applications in the present and future scenario. Besides, the performance study of off grid and grid connected SPV power plant has been discussed and presented in detail. From the literature, it is found that the efficiency of photovoltaic (PV) systems varies from 10% to 23%. Thus, the efficiency is the important factor which needs to be explored further for the best implementation and utilization of this emerging and useful technology around the globe. However, among all the applications discussed here, Building integrated photovoltaics (BIPV), Concentrated photovoltaics (CPV) and photo-voltaic thermal (PV/T) are found to be the most technically sound and exhibit that SPV may be a feasible solution for the future energy challenges. Again, the building integrated PV system not only reduces the area requirement, but also cuts the material and infrastructure costs of the building and hence, fulfills the technical thrust for smart building requirements. Recently developed CPV cells are found to be feasible, most promising and cost effective technology having higher efficiency and lesser material requirements than those of the other solar cells. On the other hand, as the PV/T systems produce not only the electricity but also the heat energy are found to be more useful, suitable, and promising for most of the real life applications especially, where both forms of energy are required simultaneously.

Full text

Recent advances in solar photovoltaic systems for emerging trends
and advanced applications
A.K. Pandey
a,
n
, V.V. Tyagi
b
, Jeyraj A/L Selvaraj
a
, N.A. Rahim
a,c
, S.K. Tyagi
d
a
UM Power Energy Dedicated Advanced Centre, University of Malaya, Kuala Lumpur 59990, Malaysia
b
School of Energy Management, Shri Mata Vaishno Devi University, Katra 182320, J&K, India
c
Faculty of Engineering, King Abdulaziz University, Jeddah 21589, Saudi Arabia
d
Sardar Swaran Singh National Institute of Renewable Energy, Kapurthala 144601, Punjab, India
article info
Article history:
Received 15 October 2014
Received in revised form
6 June 2015
Accepted 18 September 2015
Keywords:
Solar energy
Solar PV
Concentrated PV
Building integrated PV
Photovoltaic thermal (PV/T)
abstract
This communication presents a comprehensive review on the solar photovoltaic (SPV) systems for recent
advances and their emerging applications in the present and future scenario. Besides, the performance
study of off grid and grid connected SPV power plant has been discussed and presented in detail. From
the literature, it is found that the efficiency of photovoltaic (PV) systems varies from 10% to 23%. Thus, the
efficiency is the important factor which needs to be explored further for the best implementation and
utilization of this emerging and useful technology around the globe. However, among all the applications
discussed here, Building integrated photovoltaics (BIPV), Concentrated photovoltaics (CPV) and photo-
voltaic thermal (PV/T) are found to be the most technically sound and exhibit that SPV may be a feasible
solution for the future energy challenges. Again, the building integrated PV system not only reduces the
area requirement, but also cuts the material and infrastructure costs of the building and hence, fulfills the
technical thrust for smart building requirements. Recently developed CPV cells are found to be feasible,
most promising and cost effective technology having higher efficiency and lesser material requirements
than those of the other solar cells. On the other hand, as the PV/Tsystems produce not only the electricity
but also the heat energy are found to be more useful, suitable, and promising for most of the real life
applications especially, where both forms of energy are required simultaneously.
&2015 Elsevier Ltd. All rights reserved.
Contents
1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 860
1.1. Background of solar PV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 860
1.2. Recent advances in solar PV systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 861
2. Classification of solar photovoltaic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 861
2.1. Crystalline materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 862
2.2. Thin film solar cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 862
2.3. Concentrated solar PV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 863
2.4. Organic and polymer cells. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 864
2.5. Hybrid solar cells. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 864
2.6. Dye-sensitized solar cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 866
2.7. Other technologies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 866
3. Emerging applications of solar PV technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 866
3.1. Solar water pumping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 866
3.2. Solar home lighting systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 868
3.3. Solar PV desalination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 870
3.4. Solar photovoltaic thermal (PV/T). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 872
Contents lists available at ScienceDirect
journal homepage: www.elsevier.com/locate/rser
Renewable and Sustainable Energy Reviews
http://dx.doi.org/10.1016/j.rser.2015.09.043
1364-0321/&2015 Elsevier Ltd. All rights reserved.
n
Corresponding author.
E-mail addresses: adarsh.889@gmail.com (A.K. Pandey), sudhirtyagi@yahoo.com (S.K. Tyagi).
Renewable and Sustainable Energy Reviews 53 (2016) 859–884

3.5. Space technologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 874
3.6. Building integrated photovoltaic system (BIPV). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 875
4. Advances in performance study of solar PV systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 876
5. Conclusions and recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 881
5.1. Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 881
5.2. Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 881
Acknowledgments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 881
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 881
1. Introduction
The demand for energy has been increasing for the last several
decades, due to the enhanced industrialization, growing popula-
tion and improvement in the living standard of the people, glob-
ally. The International Energy Agency (IEA) estimated that the
developing countries are increasing their energy consumption at
the faster pace than that of developed ones and will require to
almost the double of their present installed generation capacity by
the year 2020 for meeting their demand of energy [1]. It is also
projected that the total energy consumption of the world to
increase by 44% from 2006 to 2030 [1–3] which is very likely as
can be seen from Fig. 1. The IEA has also reported that more than
1.3 billion people in the developing countries are living in the
scarce or without any access to electricity due to unavailability of
grid in these areas and other constraints [3,4].
In the developing countries, more than 80% population lives in
the rural areas and continuously harnessing the traditional source
of energy to meet their day to day requirements of energy. For
example, wood for cooking and home heating, kerosene for home
lighting, animals for agricultural activities, solar and wind energy
for crop drying, harvesting and separation purposes, while diesel
engine, canal, ponds, rivers, etc. for irrigation purposes when and
where a respective resource is available to meet their energy needs.
However, the use of wood for cooking, home heating, food pro-
cessing, etc. consumes a huge amount of energy and creates the
deforestation and pollution in the environment. In the current
scenario, the reserved energy sources or fossil fuels such as coal, oil
and gas are the major driver of economy for the whole world and
also the main contributor of environmental pollution [5]. Thus, for
the growing industrialization with the increasing population, there
is an urgent need of more and more energy for healthy and com-
petitive economic growth, while keeping the environmental fact in
the mind. It means the time has comewhen there is an urgent need
to explore the renewable energy resources which not only meet the
increasing energy requirements of the world but are also environ-
mental friendly. Therefore, the time has come when the world
community requires the energy sources which are technologically,
economically, environmentally, and socially compatible is the need
of time, for the sustainable development [6,7].
Also the renewable energy sources such as, solar, Bioenergy,
wind, small hydro, geothermal and tidal, etc. are the promising
sources of energy with all the qualities required to meet the pre-
sent and future energy need. The renewable energy sources are
free and abundantly available in the environment, however, facing
some serious challenges regarding the low efficiency, higher
capital cost and unequal availability over the time and location
around the globe. The capital cost of these systems is much higher
than that of the fossil fuel based systems while, the efficiency is
quite low and hence, are not much economical at this point of
time. The scientists and engineers around the globe are con-
tinuously making numerous efforts to overcome these issues and
make this world a livable place for the common population [8].
1.1. Background of solar PV
There has been a continuous growth in the utilization of
renewable energy in general and solar energy in particular for
useful applications, especially, after the oil crisis during the late
1970s. This has compelled the scientists and policy makers around
the globe to emphasize on different ways to harness solar energy
more effectively and efficiently, especially, in the area of thrust. In
the terrestrial regions, solar energy can be utilized in two different
ways; one through solar thermal route using solar collectors, hea-
ters, dryers, etc. and the other is solar electricity using solar pho-
tovoltaic (SPV) as can be seen in Fig. 2 [9]. The photovoltaic is the
direct conversion of sunlight into electricity without using any
interface. Solar PV systems are rugged and simple in design, mod-
ular in the nature, requires a little maintenance and stand alone can
generate the power from microwatts to megawatts. The standalone
PV system has played a very important and critical role in the
electrification of the rural areas, especially, in the developing world
[10–13]. A solar PV module along with the charge controller and
battery as per the requirement is sufficient for electrifying the rural
home and known as the solar home lighting system. This increases
Fig. 1. World marketed energy[1].
Solar energy PassiveActive
Photovoltaic
CPV Crystalline
silicon
Thin film
Solar thermal
Solar thermal
non-electric
Solar thermal
electric /
concentrated solar
power
Solar Dish
Collector
Power
Tower
Parabolic
Trough
Fresnel
Mirror
Fig. 2. Assorted types of solar energy based on global market availability [9].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884860

the demand for solar PV for a variety of applications. The cost per
watt of the solar PV has been declined 3.50 $/Wp for first genera-
tion solar cells to 1.0 $/Wp for second generation solar cells and
expected to decrease further up to 0.50 $/Wp in the near future
[14,15]. The Government policies for providing the feed in tariff in
many developing countries have helped in the popularization and
installation of PV systems. For the countries participating in the IEA-
PVPS program, the total installation capacity has been found to be
increased from 103 MW in 1992 to 63,611 MW in the year 2011 [16].
1.2. Recent advances in solar PV systems
Many solar energy systems, including but not limited to solar
water heaters, solar air heater/dryer, solar desalination, solar home
lighting, concentrated PV, Building integrated PV (BIPV) has been
implemented and studied using energetic and exergetic approaches
for different purposes [10–12]. The different types of PV materials
for solar cells are available in the market nowadays, but due to high
efficiency and matured technology, Silicon based solar cells are
leading the market from the beginning. However, researchers
around the world are exploring the other options to produce elec-
tricity more efficiently by means of solar cells and hence, R&D for
developing new material is going on. Many authors have reviewed
the recent studies and developments on solar PV systems and their
possible applications in different areas [17–24]. However, low cost
and flexibility in nature makes the thin film technology to be the
potential technology for the solar cells [25]. First Solar reduced its
price down to $0.75 per watt, 50% less than crystalline solar cells.
But its conversion efficiency is still a cause of concern among the
scientific community. Therefore, the experimental work on different
materials such as, amorphous silicon, CdS/CdTe and CIS is going on
for efficiency enhancement of the thin film solar PV technology
[26]. Also options in selection of materials such as, material polymer
or organic material as a solar cell are the other competent options in
the thin film technology which not only enhanced the conversion
efficiency but also suitable to meet the concern over the environ-
mental problems [27]. Advancement in the research and develop-
ment related to different types of solar cell materials is going on.
The latest developments in the solar cell efficiency is given in the
Fig. 3 [28] while, the detailed developments is given in the next
section of this article.
The objective of the present paper is to reflect the recent
advances in the solar PV systems and its emerging applications and
to find out the thrust area of the research in PV technology in the
current scenario. Section 1 of the paper presents the introduction
part, which includes current energy scenarios in general and for solar
PV in particular. Section 2 presents the classification of solar PV and
deals with the different types of solar PV cells available for the use.
Section 3 describes the advances in the solar PV based systems and
their emerging applications. Section 4 covers the recent advances in
the performance evaluation of solar PV systems, both the grid con-
nected and the stand alone systems. Finally, the results from the
study have been concluded in the last section along with recom-
mendations for future scope of the work and the utilization of this
fast growing technology for a wide range of applications globally.
2. Classification of solar photovoltaic
The types of PV materials on which solar cells are available in the
market is given in Fig. 4 [29].However,duetohighefficiency and
matured technology, the Silicon based solar cells are leading the
market till now as can be seen in the Fig. 5 [30].World'soverallPV
cell/module production is increasing day by day. Fig. 6 shows the
world wide PV cell/module production for the years 2005 to 2013. As
can be seen from the figure, China is the leader as far as PV pro-
duction is concerned followed by Taiwan and Japan in the year 2013
[31]. Crystalline semiconductors viz. Si and GaAs have the highest
performance as compared the other options available in the market.
While, the solar cells based on the less pure materials viz. poly-
crystalline or amorphous inorganic or organic materials, or combi-
nation of these having less performance but cost is low [32].There-
fore, researchers all over the world are exploring other options with
higher performance to produce electricity by the means of solar cells.
Also due to low cost and light weight as compared to the mono and
poly crystalline solar cells, the thin film technology has been seen as a
potential technology but its low efficiency is still a cause of concern
among the scientificcommunity[25].Forefficiency enhancement of
Fig. 3. Best research cell efficiencies [28].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884 861

the thin film technology, the experimental work on three different
materials such as, the amorphous silicon, CdS/CdTe and CIS is going
on worldwide [26]. However, due to the environmental related pro-
blems associated to these materials, the polymer and organic mate-
rials based thin film technology are the other competent options [27].
The advancement in the research related to different types of solar
cell materials are given as below:
2.1. Crystalline materials
The crystalline silicon solar cells have many advantages such as,
high efficiency than that of other solar cells and easy availability which
forced the manufacturers to use them as a potential material for solar
cells [33]. In most of the cases, the monocrystalline type solar cells are
used as they have high efficiency but due to higher cost of the
material, it is still a cause of concern for both the manufacturers and
the end users. Therefore, the industries are looking for alternatives and
polycrystalline type of solar cell may be another option which has
lower cost as compared to the mono crystalline cell [34]. The scientific
community also looking for GaAs based solar cell as an alternative,
which is a compound semiconductor, form by gallium (Ga) and arsenic
(As) having the similar structure as silicon. The GaAs material is having
high efficiency and low weight, but higher cost as compared to the
mono- and polycrystalline silicon solar cells. However, the GaAs based
solar cell exhibits to have high heat resistance and found to be suitable
for concentrated PV module for power generation, hybrid use and
space applications [35].
2.2. Thin film solar cells
The thin film technology based solar cells are cheaper as com-
pared to silicon based solar cells due to the fact that the require-
ment of material is lesser in the manufacturing process of the
former [26]. The amorphous silicon being non-crystalline and
disordered structure form of silicon is having 40 times higher
absorptivity rate of light as compared to the monocrystalline silicon.
Thus the amorphous silicon based solar cells are very famous as
compared to other materials such as, CIS/CIGS and CdS/cdTe due to
the higher efficiency of the former. Williams et al. [36] presented
the challenges and prospects in developing the CdS/CdTe substrate
solar cells on Mo foil. By combining the close-space sublimation and
RF sputtering, ITO/ZnO/CdS/CdTe/Mo solar cells have been grown in
the substrate configuration. CdCl
2
annealing process was developed
using the two stage process, CdTe doping was done in the first stage
while second stage contributes to the CdTe/CdS interdiffusion by
secondary ion mass spectrometry analysis. The efficiency had been
found to be increased from 6% to 8% by the inclusion of a ZnO layer
between CdS and ITO layers and increasing the shunt resistance
from 563 Ωcm
2
to 881 Ωcm
2
. However, for improving the CdTe
solar cell characteristics, an experiment study has been conducted
by Soliman et al. [37] which revealed that the chemical heat
treatment is needed to produce better cells. On the other hand, the
copper indium gallium selenide (CIGS) based polycrystalline semi-
conductor is found to be one of the most popular choice for
materials in the recent years due to its higher laboratory scale
efficiency of about 20.3% [38,39].Jun-fengetal.[40] investigated
the selenization and annealing in CIGS films and found that after
selenization at 450 °C, two separated phases as CIS and CGS at the
top and bottom of the film as were formed. Kumar and Rao [41]
presented the review on fundamentals and critical aspect of CdTe/
CdS thin film heterojunction photovoltaic devices from the both
physics and chemistry point of view. Efficiency enhancement,
reliability and life time of this device were the prime target among
the researchers around the globe, but the target achieved till date is
far from the theoretical limits. They found that lack of under-
standing of some points such as junction activation treatment, the
formation of stable back contacts, interfacial and grain boundary
properties and impurities diffusion within the device are respon-
sible for the slow progress towards the achievement. The champion
PV
material
Crystalline
Silicon
Mono -
crystalline
Poly -
crystalline
GaAs
Thin film
Amorphou
s silicon
Single
junction
Double
junction
Triple
junction
CdS/ CdTe CIS/CIGS
Organic/
Polymer
Hybrid PV
cell
Dye -
sensitized
Fig. 4. PV material chart [29].
Fig. 5. Annual PV production capacities of thin-film and crystalline silicon based
solar modules [30].
Fig. 6. World PV cell/module production from 2005 to 2013 [31].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884862

cell and module efficiency by 2010 as published by Wolden et al.
[42] is given in Figs. 7 and 8.
However, recently published external quantum efficiency (EQE)
of the different types of solar cells are given in Fig. 9(a) and
(b) while, the terrestrial cell and submodule efficiencies and the
terrestrial module efficiencies at STC is given in Tables 1 and 2
respectively as confirmed by Green et al. [43].
2.3. Concentrated solar PV
When the solar energy concentrated and made fall onto the
photovoltaic cells thereby, enhancing the irradiance for improving
the conversion efficiency by replacing the highly expensive solar cell
material by less expensive concentrating mirrors or lenses is termed
as the concentrated solar photovoltaic (CPV) system. The con-
centrated solar irradiance has been classified by Looser et al. [44] in
different forms as shown in the schematic diagram of Fig. 10.Inthis
arrangement, the low cost solar concentrating collector with a con-
centration ratio of 3–5 along with a laboratory scale PV cell which is
quite expensive may be used. Therefore, the cost of using higher
number of low efficiency PV cells may be compensated by using
smaller size and lesser number of PV modules with the availability of
higher intensity radiation and hence, can make the system more
efficient, economical and reliable. High efficiency is one of the key
factor which is necessary to make CPV a cost effective technology.
Therefore, most of the research is going on enhancing the efficiency
at cell or module level. The developments in the efficiency impro-
vements of CPV from the year 2000 onwards and future prediction
for the improvements is shown in Fig. 11 [45]. However, the dur-
ability and life cycle of such systems needs further R&D in this
direction because high intensity radiation may cause deformation
and damage to some parts of the PV panel. As a fact, only a fraction of
the incident solar radiation striking the cell is being converted into
electrical energy. While, the remaining gets absorbed and converted
into thermal energy in the cell and may cause the junction tem-
perature to rise unless the heat is efficiently dissipated to the
environment. As the temperature of the solar cell increases, the
photovoltaic cell efficiency decreases and also the cells exhibit long-
term degradation with increment in the temperature. Thus the use of
the extracted thermal energy from the CPV system through a suitable
cooling medium can also lead to a significant increase in the overall
conversion efficiency of the combined system [46].Themajorchal-
lenges and promise of concentrators is presented by Swanson [47].
Several researchers around the globe have made attempts to ana-
lyze the performance of the CPV systems for long term applications in
different sectors leading to the sustainable development, globally. The
performance of various concentrated (1x to 950x) solar cells was
investigated by Cotal and Sherif [48] between the temperature of 25 °C
to 85 °C. The experimental results show that dV
oc
/dTdecreases less
and reaches a constant value by increasing concentration level. The
finite element (FEM) or finite difference (FDM) based software was
used to efficiently predict the thermal characteristics of the electronic
packaging of the high concentration photovoltaic system (HCPV). Kuo
et al. [49] worked on the design and development of the 100 kW high
concentration photovoltaic (HCPV) with passive cooling system at
Institute of Nuclear Research in Taiwan. The system module efficiency
with a concentration ratio of 476x was found to be 26.1% at solar
radiation of 850 W/m
2
.Minetal.[49] also designed a thermal model
for concentrator solar cells using energy conservation principles. They
studied the temperature dependence of the cell on the area of the heat
sink for different concentration ratios. Zahedi [50] presented the
review of modeling details for low concentrating photovoltaic (LCPV)
system and analyzed the effect of increased irradiance and tempera-
ture on solar photovoltaic.
A procedure for the assessment of the reliability functions of
concentrated solar photovoltaic (CPV) systems subject to real
working conditions i.e. outdoor degradation has been described by
Fig. 7. Champion efficiencies reported for cells and commercial modules for the
established PV manufacturing technologies. (For interpretation of the references to
color in this figure legend, the reader is referred to the web version of this article.)
Fig. 8. The evolution of champion cell efficiencies since 1995 for various PV tech-
nologies. (For interpretation of the references to color in this figure legend, the
reader is referred to the web version of this article.)
Fig. 9. (a) External quantum efficiency (EQE) for the new silicon, CdTe, CIGS and
concentrator cell results in this issue; (b) external quantum efficiency (EQE) for the
new amorphous (a-Si) and nanocrystalline (nc-Si) silicon results in this issue (*
asterisk denotes normalized values; others are absolute values) [43].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884 863

Fucci et al. [51]. An experimental set-up of two-axis sun tracker
CPV system in the outdoor conditions installed at ENEA labs in
Portici (Italy), is shown in Fig. 12.
The experimental set-up of CPV has been modified by inserting the
by-pass diodes and connecting the solar cells in series configuration.
Different parameters such as open circuit voltage (V
oc
), short circuit
current (I
sc
), shunt resistance (R
s
) and Fill factor (FF) was evaluated to
get the real performance of the system in outdoor conditions.
2.4. Organic and polymer cells
In recent years, the organic solar cells are becoming favorable
choice as the alternative material for solar cells because of their
suitable prosperities such as, mechanical flexibility, low fabrication
cost, semi transparency and light weight. However, the efficiency
of these types of solar cells is still very low as compared other
types of solar cells and has been reported around 8% in the lit-
erature [52]. The high performance solar cells using poly (3-hex-
ylthiophene) (P3HT) as the donor, and [6, 6]-phenyl C60 butyric
acid methyl ester (PCBM) as the acceptor and/or bulk hetero-
junction (BHJ) structures has been developed by many laboratories
around the world [53,54]. Gilot et al. [55] found that under the
applied optical and electrical bias, the external quantum efficiency
of two terminal tandem solar cell changed by 16%. Lizin et al. [56]
presented the review on life cycle analyses (LCA) of organic solar
photovoltaics (OPV) and found that OPVs are the one of the best
performing cells as far as environmental point of view is con-
cerned. Pei et al. [57] investigated the metal–organic interfaces of
a P3HT:PCBM bulk-heterojunction (BHJ) organic solar cell using
X-ray photoelectron spectroscopy (XPS) under high electrical field.
They reported that power conversion efficiency of a polymer solar
cell enhanced by more than 8% using the above arrangement in
solar cells. For improving the performance of polymer solar cell a
controlled layer of multi-wall carbon nanotubes (MWCNT) was
grown directly on top of fluorine-doped tin oxide (FTO) glass
electrodes as a surface modifier by Capasso et al. [58]. The power
conversion efficiency of polymer solar cells with FTO/CNT elec-
trode was found to be higher than 2%, which may further improve
the overall performance of polymer based solar cells.
2.5. Hybrid solar cells
Conventional solar cells are being made by using the inorganic
materials such as Silicon. The efficiency of these solar cells is
comparatively high but, the materials and processing techniques
are costly. On the other and, organic materials and their processing
Table 1
Confirmed terrestrial cell and submodule efficiencies measured under the global AM1.5 spectrum (1000 W/m
2
)at25°C (IEC 60904-3: 2008, ASTM G-173-03 global) [43].
Classification
a
Efficiency Area
b
V
oc
J
sc
Fill factor Test center
c
(%) (cm
2
) (V) (mA/cm
2
) (%) (date) Description
Silicon
Si (crystalline) 25.670.5 143.7 (da) 0.740 41.8
d
82.7 AIST (2/14) Panasonic HIT, rear junction
Si (multicrystalline) 20.870.6 243.9 (ap) 0.6626 39.03 80.3 FhG-ISE (11/14)
e
Trina Solar
Si (thin transfer submodule) 21.270.4 239.7 (ap) 0.687
f
38.50
e,f
80.3 NREL (4/14) Solexel (35 μm thick)
Si (thin film minimodule) 10.570.3 94.0 (ap) 0.492
f
29.7
f
72.1 FhG-ISE (8/07)
g
CSG Solar (o2μm on glass; 20 cells)
III–V cells
GaAs (thin film) 28.870.9 0.9927 (ap) 1.122 29.68
h
86.5 NREL (5/12) Alta Devices
GaAs (multicrystalline) 18.470.5 4.011 (t) 0.994 23.2 79.7 NREL (11/95)
g
RTI, Ge substrate
InP (crystalline) 22.170.7 4.02 (t) 0.878 29.5 85.4 NREL (4/90)
g
Spire, epitaxial
Thin film chalcogenide
CIGS (cell) 20.570.6 0.9882 (ap) 0.752 35.3
d
77.2 NREL (3/14) Solibro, on glass
CIGS (minimodule) 18.770.6 15.892 (da) 0.701
f
35.29
f,i
75.6 FhG-ISE (9/13) Solibro, 4 serial cells
CdTe (cell) 21.070.4 1.0623 (ap) 0.8759 30.25
e
79.4 Newport (8/14) First Solar, on glass
Amorphous/microcrystalline Si
Si (amorphous) 10.270.3
k
1.001 (da) 0.896 16.36
e
69.8 AIST (7/14) AIST
Si (microcrystalline) 11.470.3
l
1.046 (da) 0.535 29.07
e
73.1 AIST (7/14) AIST
Dye sensitized
Dye 11.9 70.4
m
1.005 (da) 0.744 22.47
n
71.2 AIST (9/12) Sharp
Dye (minimodule) 10.070.4
m
24.19 (da) 0.718 20.46
e
67.7 AIST (6/14) Fujikura/Tokyo U.Science
Dye (submodule) 8.870.3
m
398.8 (da) 0.697
f
18.42
f
68.7 AIST (9/12) Sharp, 26 serial cells
Organic
Organic thin-film 11.070.3
o
0.993 (da) 0.793 19.40
e
71.4 AIST (9/14) Toshiba
Organic (minimodule) Multijunction devices 9.570.3
o
25.05 (da) 0.789
f
17.01
e,f
70.9 AIST (8/14) Toshiba (4 series cells)
InGaP/GaAs/InGaAs 37.971.2 1.047 (ap) 3.065 14.27
j
86.7 AIST (2/13) Sharp
a-Si/nc-Si/nc-Si (thin-film) 13.470.4
p
1.006 (ap) 1.963 9.52
n
71.9 NREL (7/12) LG Electronics
a-Si/nc-Si (thin-film cell) 12.77.4%
k
1.000 (da) 1.342 13.45
e
70.2 AIST (10/14) AIST
a
CIGS¼CuInGaSe
2
; a-Si¼amorphous silicon/hydrogen alloy; nc-Si¼nanocrystalline or microcrystalline silicon.
b
(ap)¼aperture area; (t) ¼total area; (da)¼designated illumination area.
c
FhG-ISE¼Fraunhofer Institut für Solare Energiesysteme; AIST ¼Japanese National Institute of Advanced Industrial Science and Technology.
d
Spectral response and current–voltage curve reported in Version 44 of these tables.
e
Spectral response and current voltage curve reported in the present version of these tables.
f
Reported on a “per cell”basis.
g
Recalibrated from original measurement.
h
Spectral response and current–voltage curve reported in Version 40 of these tables.
i
Spectral response and current–voltage curve reported in Version 43 of these tables.
j
Spectral response and/or current–voltage curve reported in Version 42 of these tables.
k
Stabilised by 1000-h exposure to 1 sun light at 50 C.
l
Not measured at an external laboratory.
m
Initial performance (not stabilised). References [12] and [13] review the stability of similar devices.
n
Spectral response and current–voltage curve reported in Version 41 of these tables.
o
Initial performance (not stabilised). References [14] and [15] review the stability of similar devices.
p
Light soaked under 100 mW/cm
2
white light at 50 °C for over 1000 h.
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884864

techniques are cheap and their functionality can be tailored by
molecular design and chemical synthesis. Therefore, the combi-
nation of both the inorganic and organic materils leads to the best
and cheap alternative for the solar cells and combination of these
two is known a the hybrid solar cells [59] and a schematic diagram
of hybrid structure is shown in Fig. 13 [60]. Due to combination of
high charge-carrier mobility of inorganic semiconductors along
with the strong optical absorption of the organic semiconductors,
the hybrid organic-inorganic solar cells got much attention in the
recent era. Zhang et al. [61] fabricated and investigated the
amorphous undoped intrinsic silicon, B-doped silicon and P-doped
silicon hybrid bilayer structures with poly (3-hexylthiophene). The
open-circuit voltages (V
oc
) and fill factors (FF) of the devices are
found to be moderate while these are found to be strongly
dependent on the doping type of a-Si:H films.
Table 2
Confirmed terrestrial module efficiencies measured under the global AM1.5 spectrum (1000 W/m
2
) at a cell temperature of 25 °C (IEC 60904-3: 20 08, ASTM G-173-03 global)
[43].
Classification
a
Effic.
b
(%) Area
c
(cm
2
)V
oc
(V) I
sc
(A) FF
d
(%) Test center (date) Description
Si (crystalline) 22.970.6 778 (da) 5.60 3.97 80.3 Sandia (9/96)
e
UNSW/Gochermann
Si (large crystalline) 22.4 70.6 15,775 (ap) 69.57 6.341
f
80.1 NREL (8/12) SunPower
Si (multicrystalline) 18.570.4 14,661 (ap) 38.97 9.149
g
76.2 FhG-ISE (1/12) Q-Cells (60 serial cells)
GaAs (thin film) 24.171.0 858.5 (ap) 10.89 2.255
h
84.2 NREL (11/12) Alta Devices
CdTe (thin-film) 17.570.7 7021 (ap) 103.1 1.553
i
76.6 NREL (2/14) First Solar, monolithic
CIGS (Cd free) 17.570.5 808 (da) 47.6 0.408
j
72.8 AIST (6/14) Solar Frontier (70 cells)
CIGS (thin-film) 15.770.5 9703 (ap) 28.24 7.254
k
72.5 NREL (11/10) Miasole
a-Si/nc-Si (tandem) 12.2 70.3
l
14,322 (t) 202.1 1.261
j
68.8 ESTI (6/14) TEL Solar, Trubbach Labs
Organic 8.770.3
m
802 (da) 17.47 0.569
j
70.4 AIST (5/14) Toshiba
a
CIGSS¼CuInGaSSe; a-Si ¼amorphous silicon/hydrogen alloy; a-SiGe¼amorphous silicon/germanium/hydrogen alloy; nc-Si¼nanocrystalline or microcrystalline sili-
con.
b
Effic.¼efficiency.
c
(t)¼total area; (ap) ¼aperture area; (da)¼designated illumination area.
d
FF¼fill factor.
e
Recalibrated from original measurement.
f
Spectral response and current–voltage curve reported in Version 42 of these tables.
g
Spectral response and/or current–voltage curve reported in Version 40 of these tables.
h
Spectral response and current–voltage curve reported in Version 41 of these tables.
i
Current–voltage curve reported in the Version 44 of these tables.
j
Spectral response and/or current–voltage curve reported in the present version of these tables.
k
Spectral response reported in Version 37 of these tables.
l
Stabilised at the manufacturer for 149 h to the 2% IEC criteria.
m
Initial performance (not stabilised).
Fig. 10. Classification of common technologies and system set-up for concentrated solar irradiance conversion [44].
Fig. 11. Development of record efficiencies of III–V multi-junction solar cells
and CPV modules (cells: x*AM1.5d; modules: outdoor measurements) [45].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884 865

2.6. Dye-sensitized solar cell
The dye-sensitized (DS) solar cells exhibit certain qualities
including lower cost and simple manufacturing process as compared
to silicon based which make them suitable and potential alternative
for the future application as solar cells. O'Regan and Gratzel [62]
developed the dye-sensitized solar cells (DSSCs) in the early 1991, the
operating principal of dye-sensitized solar cell is shown in Fig.14.
Generally, this type of material comprises of five working principles
such as, a mechanical support coated with Transparent Conductive
Oxides; the semiconductor film, usually TiO
2
; a sensitizer adsorbed
ontothesurfaceofthesemiconductor;anelectrolytecontaininga
redox mediator; a counter electrode capable of regenerating the
redox mediator like platine [63].Ahmadetal.[64] reported a new
cost effective platinum-free counter electrodes (CEs) for dye sensi-
tized solar cells (DSSCs). The power conversion efficiency of these
electrodes was found to be around 4%, which is slightly higher than
that of the DS solar cells with a standard Pt based CE.
2.7. Other technologies
As discussed above, many new materials have been invented so
far, however, more invention is underway for solar cells, with the
objectives to improve the performance of solar cells, while a few
advanced technology has been ascertained in the processing of PV
solar cells. The band gap can be controlled by nanoscale compo-
nents to increase the power conversion efficiency of solar cell
using nanotechnology or sometimes referred as “third-generation
PV”. Three different devices are used in nanotechnology for the
production of PV cell such as, carbon nanotubes (CNT), quantum
dots (QDs) and “hot carrier”(HC) based solar cell, respectively [65].
3. Emerging applications of solar PV technology
There has been an enormous effort from the scientific community
to look for alternative and clean energy resources to fulfill the pre-
sent and future needs. Also, due to limitation of conventional energy
resources, there is an urgent need to explore renewable energy
resources for healthy, competitive and sustainable economic growth
worldwide, while keeping the environment neat and clean for the
coming generation. The recent advances of PV technologies have
filled up certain gaps between demand and supply of energy in a
wide range of new and emerging applications in general and in some
areas of technical thrust in particular, globally. Nowadays, there are
different technologies available in PV sector to meet the increasing
demand of energy with certain limitations. Among the available PV
technologies, there is certain advancement in some specificareas,
such as, solar PV based water pumping, solar PV home lighting
systems, solar PV powered desalination plant, solar PV thermal, space
technology, building integrated solar PV systems and concentrated
solar PV systems and few of which are performing well in the field of
real life applications. Thus, some of the recent advances in the solar
PV systems and their emerging applications in the area of thrust
within the current and future scenario are given as below:
3.1. Solar water pumping
One of the most important applications of solar photovoltaic
technology is the is pumping of water for both irrigation and
drinking purposes, especially in remote and rural areas [66–69].
From the last few decades, PV water pumping system has become a
very popular technology and shows the good potential for provid-
ing good quality water at the desired site [70]. As per the World
Bank report, more than ten thousand solar PV water pumping
systems were installed by the year 1993, which has increased to
over sixty thousand by the year 1998 worldwide [71,72].Usefulness
of solar PV water pumping systems becomes more visible when it
comes to the rural and remote areas, especially, where the con-
nectivity through the grid is not a feasible option. A solar photo-
voltaic water pumping system is the combination of a PV array, a
DC/AC surface mounted/ submersible/floating motor pump set,
some electronics parts “On–Off”switch and interconnecting cables.
The solar PV panels are mounted on a suitable structure and the
electronics parts could also include Inverter for DC to AC conversion
of current and the maximum power point tracker (MPPT). In gen-
eral, the batteries are not the part of the solar PV water pumping
system as water pumping for irrigation purposes can be done
during the daytime while for drinking purpose a suitable storage
facility may be installed at the nearby suitable place[73].
Kaldellis et al. [74] carried out the detailed study on solar PV
water pumping system (SPVPS) to calculate the overall efficiency
and the total quantity of water that such a system can deliver on
daily basis. A total of 12 PV panels (50 Wp, 6 series and 2 parallel)
were used in the study as can be seen in the schematic diagram of
Fig. 15. The electrical losses in the systems were found to be very
low because the energy efficiency was mainly concerned about the
two factors, one is the PV generator and the other is the efficiency of
the pumping set. The overall energy efficiency of the proposed
Fig. 12. ENEA's outdoor facility [51].
Fig. 13. Schematic diagram of the hybrid structure [61].
Fig. 14. Operating principle of dye-sensitized solar cell [62].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884866

systemwas found to be around 5%, which isrelatively good enough,
because the efficiency of PV panel used in this study was merely 8%.
Therefore, by using the proposed solar PV water pumping system
(610 Wp PV), more than 200 remote consumers can be benefitted
by meeting their daily water need. The hybrid water pumping
system which is a combination of wind turbine and solar PV array
and an individual water pumping system using wind turbine and
solar PV array was also studied by Vick and Neal [75]. For perfor-
mance analysis, three different PV arrays (320, 480, and 640 W) and
a 900 W wind turbine was selected and the hybrid water pumping
system was also analyzed using the three different configurations.
Based on the experimental observations, they [75] found that the
hybrid system has pumped around 28% more water than those of
the WT and PV systems individually in the month of greatest water
demand (August). The performance of the hybrid water pumping
system with the configuration of 900 W WT/320 W PV array was
found to be the best among the other two configurations, men-
tioned above, due to the lowest voltage mismatch.
Al-Smairan [76] presented the case study of a solar PV water
pumping system as an alternative to the diesel engine based
pumping systems at Tall Hassan station, Badia in Jordan. The com-
parison is made for a various variable values such as, the tank
capacity, total head, pumping requirements and PV array peak
power between the two different energy sources viz. the DG set and
the solar PV array for the same supply of water as per the details
given Table 3. The PV water pumping system was found to be more
cost effective than that of the diesel engine based water pumping
system forthe typical climatic condition of Jordan. Benghanem et al.
[77] carried out the performance analysis of a solar photovoltaic
water pumping system under composite climate of Madinah in
Saudi Arabia for a typical specification having the head of 80 m. In
this study, they configured the four different designs to get the
optimum power from the PV water pumping system to get the best
possible performance such as, 6SX3P, 8SX3P, 12SX2P and 6SX4P
where S stands for series rows and P stands for parallel rows as can
be seen in experimental set-up shown in Fig. 16. A helical type of
water pump was connected to the PV panel for the fixed head of
80 m for carrying out the outdoor tests during the months of May to
July and all the four configurations were tested ten times during the
sunny days. All the important parameters for the performance
analysis such as, instantaneous output power, current, voltage,
hourly flow rate and the solar radiation were recorded with the
help of a data logger Agilent 34970A. Finally, based on the
performance evaluation and observations, they concluded that the
8SX3P configuration is the most suitable for the supply of 22 cubic
meters of water requirements per day.
Gao et al. [78] presented the feasibility study and performance
evaluation of a field scale solar photovoltaic pumping system for
irrigation purposes at a typical climatic condition of the southern
part of Qinghai province in Tibet. To find out the feasibility and
performance of solar PV system for irrigation purposes, first of all
they analyzed the water demand of pasture for different hydro-
logical level years i.e. normal year, wet year and dry year, then based
on the artificial neutral network modeling, the change of ground-
water table of the pumping well was analyzed. Finally, based on the
end cost benefit analysis, a set of optimized parameters were pro-
posed for the designing of SPV based water pumping system. Based
on their study, they concluded that solar PV based water pumping
for irrigation has better an ecological and economic performance as
compared to the diesel engine based water pumping system for
Fig. 15. Experimental PV-pumping unit [74].
Table 3
Comparison among photovoltaic and diesel engine pumping systems [76].
US Photovoltaic Diesel engine
Initial investment 20,790 4500
Operational cost 416 7342.5
Present value cost (PVC) 24,566 71,148
Annual equivalent cost (AEC) 2706.4 7826.3
US$/m
3
. 0.200 58
Fig. 16. Control and data acquisition for PV water pumping system [77].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884 867

irrigation and other necessary related purposes. Campana et al. [79]
developed a dynamic simulation tools for the designing and vali-
dation of solar PV based water pumping system by combining the
demand of water and requirement of power from solar PV for dif-
ferent pumping systems.
In the study the technical and economic analysis were pre-
sented for AC and DC pumps having both fixed type and two-axis
type sun tracking systems. The schematic diagram of the solar PV
based water pumping system and the flow chart of the designing
process along with the dynamic simulation tools used in the study
are shown in Figs. 17 and 18, respectively. From the study, it was
found that the AC pumping set having fixed type sun tracking
system is the best and cost effective solution among all the other
solutions presented in the study.
Mekhilef et al. [80] presented the studies on application of solar
energy in agriculture sector including solar water pumping systems,
solar crop dryer, solar green houses and solar refrigeration. They
found that solar energy systems are the most suitable options for
agricultural and other domestic applications, as they have no impact
on environment and require a very less maintenance as compared to
the conventional energy systems. However, the investment cost of
these systems is still a cause of concern because both the initial
investment and per unit generation cost is higher in the case of solar
energy systems as compared to those of the conventional energy
systems. Benghanem et al. [81] carried out the effect of pumping head
for selecting four different pumping heads such as 50 m, 60 m, 70 m
and 80 m on photovoltaic water pumping system in outdoor condi-
tions of Madinah, Saudi Arabia and selected and tested for the opti-
mumdesign.Thesystemefficiency was found to be strongly depe-
ndent on the solar radiation and pumping head. The efficiency was
found to be increasing in nature with increase in solar radiation and
decrease in pumping head. The system efficiency was found to be
increasing with decreasing pumping head for low solar radiation.
However, the efficiency of the system was found to be best at 80 m
head at high solar radiation conditions. For the particular case, this
pumping head should be considered as the optimum pumping head
profilehowever,thismayvaryfordifferentPVarraysizeasflow rate
and system efficiency varies with the PV array size. Dursun and
Özden [82] presented the case study of PV powered irrigation system
with modeling of soil moisture distribution for a typical climate in
Turkey. Authors used soil moisture distribution map obtained via the
artificial neural networks method fordetermining the area needed for
the irrigation in an orchard. By using the system and software the soil
moisture distribution was determined by them. They claimed that
using the model developed by them may reduce the daily water and
energy consumption by 38% of the given orchard and hence, it is also
possible to manage the power of pump as per the water requirement
for the irrigation thereby, reducing the overall cost of the system.
3.2. Solar home lighting systems
The home lighting is one the key factors for the development
process and in most of the developing especially in the rural and
remote areas, people still use traditional and conventional sources
such as, kerosene for home lighting. The kerosene based home lighting
is not only inefficient source of lighting but also having lack of visibility
and causing health related problems among the users. According to
the world energy outlook report [83] for the 2013, it was revealed that
approximately 1.3 billion people are in the scarce of electricity around
the globe and kerosene is the only source being usedfor home lighting
especially, in Asia and Africa. It is found that the lamp powered by
conventional sources like kerosene not only produces very poor
quality of light but also emits toxic gases and the children using ker-
osene based lighting cannot read properly and also inhale toxic gases.
Also use of kerosene for home lighting provides only 0.03 lumens/
Watt in comparison of the compact fluorescent with 30–70 lumens/
Watt and white light emitting diode with 50–100 lumens/Watt of
light. According to the World Bank estimation, more than 780 million
women and children are breathing harmful particulate matter due to
the use of kerosene lamps from home lighting only. The kerosene
based lighting is dangerous, unhealthy and insufficient and causes
serious health hazards such as, respiratory and eye problems, espe-
cially, in the developing countries. This affects overall development in
thecountryasthechildrenusingthekerosenelampsareexposedto
the toxic gases and hence, are living in unhealthy environment which
ultimately creates barrier in the education [84].
Therefore, the clean energy sources like solar PV are des-
perately needed for the lighting purposes which can not only
Fig. 17. Schematic diagram of a photovoltaic water pumping system [79].
Fig. 18. Designing and dynamic modeling procedure [79].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884868

produce the sufficient and good quality light but also environ-
mental friendly energy source. In this context, solar photovoltaic
based CFLs and WLEDs provide an option for clean, safe and good
quality home lighting systems. The home lighting systems based
on SPV for individual households is hard to reach in areas where
there grid connectivity is more popular and easy to reach. The use
of SPV systems for lighting purposes by replacing the kerosene and
paraffin can reduce not only the running costs on a daily basis, but
also the reduces the health risks among the end users, besides, it
may contribute in terms of utility as the children will get the more
time to study [85–88].
The detailed study on the home lighting pattern in the rural
areas of mostly Asia and Africa was carried out by Pode [89] where
he suggested the use of LED based solar home lighting systems to
enhance the popularity and utility of these systems with better
visibility (lumens/Watt) for home lighting solutions. He also dis-
cussed different aspects and case studies of conventional home
lighting systems being used by the poor people around the globe
including health issues, fire danger and green house gas emissions
by using kerosene oil besides, the economics of solar powered CFL
and LED in detail. The schematic view of off grid AC and DC pow-
ered solar home lighting system and photographic view of LED
bulbs are shown in Figs. 19 and 20, respectively. The quality of light
was found to be improved by replacing the kerosene with the LED
lights with number of co-benefits such as, the increased in study
time with lower air pollution, while reducing the monthly elec-
tricity bill significantly, i.e. almost 70% by the use of later lighting
systems. Sastry et al. [90] developed high performance white light
emitting diode (WLED) based solar home lighting systems under
the joint project between Solar Energy Centre (Gurgaon) and
Agency for Non-Conventional Energy and Rural Technology
(ANERT), India. In this project, a 100 lm/W WLED, 6W at 16.4V PV
module with 20 V of open circuit voltage and 0.4A current and 12 V
and 7AH capacity of sealed maintenance free (SMF) valve regulated
lead acid (VRLA) battery was selected for the performance analysis.
The schematic of the experimental set-up for the electronic mea-
surement is shown in Fig. 21. From this study, they concluded that
thesaidhomelightingsystemisbetterchoicethanthatofCFL
based system in terms of output and cost for solar PV applications.
Komatsu et al. [91] determined the characteristics of households
installing solar home systems (SHS) in Bangladesh and the factors
affecting SHS user satisfaction were determined for making this
technology popular in rural areas. It was found that the users who
found the SHS system as a replacement of kerosene were more
satisfied and the users whose children got the extra time for study
were highly satisfied. While from the econometrics analysis, it was
found that SHS battery replacement has the negative impact on user
satisfaction. Therefore, the reduction in frequency of battery repla-
cement can improve the user satisfaction. Hong and Abe [92] pre-
sented the detailed mathematical modeling and optimizing techni-
que for a sub-centralize LED lanterns for actual rural island case
(Pangan-an Island, Philippines), the sub-centralized rental system is
shownintheFig. 22. The study throws a light into many key aspects
including, planning, policy selection, operations and management for
LED lamps rental systems. However, the dynamically optimized lamp
(s) purchase policy was found to be better than that of statically
optimized policy in terms of financial returns. They also proposed
that sub-centralized lantern rental approach can serve as an option
for providing clean energy especially, for the hard to reach areas in
the country. The outcome of the study was found to be very useful
with new opportunities for the stakeholders including investors,
manufacturers and project developers who are working in the area of
solar photovoltaic based home lighting systems.
Raman et al. [93] presented the opportunities and challenges
regarding the use of solar PV based systems such as solar home
systems, mini grids, etc. in the rural areas of India having the eco-
nomic feasibility of various components of micro grid PV systems
viz. battery, inverter etc. has been explained in detail. They [93]
found that main reason behind the discouraged use of SPV systems
is low efficiency and high investment cost and suggested for more
R&D efforts should be made by the scientific community to come
out with a higher efficiency and improved technology to make
these products useful and cost effective for the end users. They also
suggested that law must be made for the different organizations
such as, industries, shopping malls, schools and colleges to meet at
least there 30% of their energy demand by the means of solar PV
system. Bond et al. [94] discussed the development impact of three
different sizes of solar home lighting systems such as, 10, 40 and
80 Wp for rural East Timor by combining the participatory and
quantitative tools for studying the solar home system for 77 small
groups. In total, 24 rural communities and supplemented with a
household survey of 195 solar home lighting systems users. They
found that increase in the size of solar home lighting systems not
provided the proportionate increases in development impact or we
can say that small SHS has much development impact than that of
larger one. They suggested three fold significant implications of
solar home lighting systems for the East Timor viz. prefer small
systems rather than larger ones, PV lighting in the kitchen in every
possible ways and matching of solar home lighting systems oper-
ating cost with the user's income.
Komatsu et al. [95] again discussed the factors affecting the users
satisfaction using the solar home lighting systems in the rural areas of
Bangladesh. The study revealed very important facts which may be
useful for the satisfactory installations of solar home lighting systems
in the rural areas in the long run. He emphasized that frequent battery
repair, maintenance and replacement play a negative role on the
satisfaction of the end user and suggested that there is a need for more
research about the life cycle analysis of batteries used in the SHS as
confirmed by econometric analysis. However, the higher level of
satisfaction was found to be for among those users who get benefitted
duetoincreaseinthestudytimeofthechildren.Theimpactof
switching from CFL to LED lights for solar home lighting systems in
India on government policy, reduction in price and other factors has
been presented by Harish et al. [96]. Around seven different compa-
nies working in the area of developing solar products has been chosen
for the study of operations, distribution network and current products
out of which four companies are exclusively making the LED based
solar lanterns and SHSs, while, rest three are in the process to switch
from CFL based product to LED based. Many factor such as, luminosity,
price, service and maintenance and product configuration were found
Fig. 19. (a) Off-grid AC solar power systems to provide power for normal AC
appliances. (b) Off-grid DC solar power systems to provide power for only DC
appliances [89].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884 869

which can be considered before the transition from CFL to LED based
products. However, the price reduction which is about 20% was found
to be the significant driving factor in the adopting of the LED based
products than that of the CFL based products. McHenry et al. [97]
designed the 1000 lumens (lm) of light based on solar PV LED system
with battery for the use of artisanal light fishers for 8 h per night on
Lake Victoria and other lakes in the region. They also developed the
simulation and economic model for the performance analysis of the
designed system and suggested that the designed system is sufficient
for providing additional lighting for fishers for the day and night use.
3.3. Solar PV desalination
Many countries especially, the developing, less developing,
under developing and poor are facing scarcity of fresh drinking
water which is one of the basic needs after air, as contaminated
water causes many diseases. According to the World Health Orga-
nization (WHO) estimation, more than 20% of the world population
has scarcity of potable drinking water and the majority of people
are from the developing world. There are many traditional and
modern techniques to purify the contaminated water from canal,
river, pond, lake, sea, etc. and to make it suitable for drinking and
related purposes. The desalination of sea/brackish water is a tech-
nique by which water can be purified for drinking and other related
purposes. The desalination of water can be accomplished basically
by using three common processes, thermal processes, membrane
processes and hybrid process. In thermal process, the phase change
occurs such as Multi Stage Flash (MSF) and Multi-Effect Distillation
(MED) however, in Membrane processes, phase change don't occurs
such as Electro dialysis (ED), Reverse Osmosis (RO) and hybrid
process is the combination of both i.e. thermal and membrane such
a membrane distillation (MD). Some work has been reported in the
literature [98,99] to use solar energy for desalination which can be
done in two ways; firstly, the thermal process in which the phase
change of water occurs and secondly, by producing the electricity to
support the membrane process using solar PV modules. However,
depending on the requirement of electrical energy for the process,
the size of the PV array along with other sub systems such as,
battery for storage of power, charge controller and Inverter for DC to
AC conversion of current can be modeled. But due to the due to
involvement of batteries and other components, the economics of
the entire system is not yet popular however, these technologies
(PV-RO and PV-ED) are growing rapidly globally. Therefore, it is the
need of the time to develop suitable and applicable technology
Fig. 20. LED lamp sources for lighting [89].
Fig. 21. Schematic of the experimental set-up for electronics measurement [90].
Fig. 22. Lamp rental system and cycle [92].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884870

which can provide economical and acceptable solution for water
purification to reduce the scarcity of fresh water to the people
around the globe especially, in the ruraland remote areas. However,
it is evident from the literature that the scientificcommunityis
making continuous effort to get the economical solution for water
purification and to meet the needs of the people globally [100–105]
and the work in this direction has been summarized here.
The technical and economical aspects of PV based solar desa-
lination system were discussed by Al-Karaghouli et al. [106] and
suggested that for small scale PV powered distillation systems are
successful and even economically viable for rural and remote
areas, especially, where both grid electricity and fresh water
availability is a problem, a schematic diagram of typical PV-ED
system is also shown in Fig. 23. However, the large scale imple-
mentation of such systems is still a cause of concern due to many
technological barriers including large initial investment. Also for
the rapid development and deployment of this technology at the
ground root level, the collaborations between industry and R&D
institutions were suggested through on-site experiments with
more installations. Koutroulis and Kolokotsa [107] proposed a
methodology for optimal sizing of photovoltaic system and wind
powered desalination systems. The developed methodology for
the designing of desalination system tested for the design of two
different types of desalination systems, covering the potable water
demands of a small community and of a residential household in
order to prove its on-site effectiveness. It was found that the
capital cost of these systems play the major role and affect the
overall configuration cost which reaches to 72% and 84% of the
total cost for the household and the community, respectively.
However, the operational cost which is affected by solar radiation
availability and wind energy potential being intermittent in nature
are found to be cost effective. Finally it was concluded that using
the PV-WG hybrid system is more cost effective than that of using
PV and wind alone systems, separately and individually.
Qiblawey et al. [108] worked on the design and performance
evaluation of the PV powered water desalination RO pilot plant under
the climatic condition of Jordan. The system is composed of a softener,
PV modules of 433 Wp and RO unit with 500 L capacity of pure water
production per day. The effect of different performance parameters
such as, the ambient temperature, solar radiation, operating pressure,
etc. on the RO-PV system was also studied in detail and it was
found to be better when softener was used and produced water at
13.82 kWh/m
3
and 1.9 kWh/m
3
without using the softener [what does
these results exhibit]. Karellas et al. [109] investigated the case study of
an autonomous hybrid solar thermal ORC-PV RO desalination system
in Chalki Island. They found that the designed system delivers potable
water in the anhydrous areas at a cost of 10.17 V/m
3
which can be
reduced to 9.33 V/m
3
. According to them, the selected case study can
be described as a mid capital project and can deliver about 83,000 m
3
capacity of water annually but ultimately depends on the meteor-
ological conditions and other parameters of the specified area. How-
ever, they also suggested that the project is cost effective, if a subsidy
of 40% for the capital cost is given, which may ensure the production
of potable water at a cost of 6.52 V/m
3
.
Ghaffour et al. [110] presented the technological development of
solar desalination system and the contribution of the Middle East
Desalination Research Center (MEDRC), Oman. They also reported
that for the promotion of solar desalination systems, MEDRC has
sponsored 17 different R&D projects on solar desalination and other
renewable energy technologies for remote areas. As it is evident that
it is beneficial technologically by coupling the conventional desali-
nation processes like Electrodialysis (ED), Multi Effect Distillation
(MED), Reverse Osmosis (RO) and Multi Stage Flash (MSF) with solar
photovoltaic. However, from economic point of view the coupling of
conventional desalination processes with solar photovoltaic is still a
cause of concern. Keeping this in mind the fact that the coupling of
the conventional desalination processes with the solar PV systems
are not economical and unviable for rural areas hence, MERD has
sponsored a project on “small solar multi effect desalination plant”
for rural applications and is shown in Fig. 24. After analyzing the
different sponsored R&D projects, they found that solar desalination
technology is beneficial at small/medium scale applications in
remote areas where there is unavailability of grid. However, more
R&D efforts on the coupling of solar desalination with other renew-
able energy technologies has been suggested for enhancing the
performance and reducing the cost of the fresh water obtained. The
state of the art solar PV based membrane distillation processes was
given by Abraham and Luthra [111] for social-economic development
in India. The comparative study of reverse osmosis and electro-
dialysis membrane desalination processes powered by solar PV was
Fig. 23. A schematic diagram of a PV-ED system [106].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884 871

presented. Also the economic analysis of pure water obtained
through PV-RO and PV-ED processes was carried out and compared
with that of the diesel powered RO and ED processes, respectively for
acapacityof50m
3
of water per day for a life span of 20 years. As per
the study, the desalination capacity is expected to increase to
1,449,942 m
3
/day by 2015 and 291,820 m
3
/day in 2008 due to
growing demand and more focus on desalination by the states spe-
cially Gujarat, Tamil Nadu and Andhra Pradesh. For sea water and
brackish ground water, the membrane desalination processes of PV-
RO and PV-ED were found to be the most suitable processes due to
less energy intensive than that of the thermal processes.
The environmental impact assessment of three different types of
desalination systems including the passive solar still, solar PV powered
RO module and truck delivery from a conventional RO plant using life
cycle analysis (LCA) approach has been studied by Jijakli et al. [112].
The schematic of the PV powered solar desalination system is given in
Fig. 25. In order to get the deeper insight into the model, the basic
system components and processes were modeled and varied. The PV
powered RO system was found to be having the least environmental
impact among the three cases studied. Qtaishat and Banat [113]
reviewed the literature on solar energy based membrane distillation
(MD) unit, while discussing the principle, types, advantages and dis-
advantaged, economic feasibility and mathematical model of the solar
energy based MD systems. The MD system is a hybrid technology of
both the thermal energy and distillation and membrane processes and
relatively a new process for distillation of water. The principle of MD is
shown in Fig. 26,whileFig. 17 shows the vacuum membrane
distillation (VMD) system for the production of potable distilled water.
Based on the results from these systems, they concluded that the
system is still costly and has not been commercialized so far however,
exhibits the potential for future use not only for remote areas but also
for urban areas, if the cost of the MD systems can be lowered further
by means technological advancement through more R&D activities in
this direction. (Fig. 27).
3.4. Solar photovoltaic thermal (PV/T)
The solar radiation incident on the surface of the PV panel not
only being converted into electricity, but is also being converted
into heat, partly and ultimately increases the temperature of the PV
cells thereby, reducing the overall electrical efficiency of the solar
cell [114–116]. Therefore, integrating both the concepts of PV for
electricity generation and the produced heat energy for other
thermal application can be more efficient and economical leading to
a new technical term as the photovoltaic-thermal (PV/T) system.
The PV/T collector system is a concept in which a solar PV panel is
utilized for electricity generation by using electromagnetic radia-
tions from the Sun, while the part of radiation absorbed by the
panel raises the temperature and may be used as the thermal
energy for other useful purposes and hence, both power and heat
can be produced by the single systems simultaneously. The PV
material plays a very important role in the PVT technology, as the
temperature of the PV material increases, the electrical conversion
efficiency decreases due to drop in the open circuit voltage [116].
Therefore, the choice of PV material to be used for the PV/T collector
is a key factor in the design of the PV/T system which ultimately
depends on the type of application. The PV material is selected
based on the operating temperature, in general, the crystalline
Silicon cells (c-Si) having temperature coefficient is 0.45%/K are
used for low temperature, while, the triple-junction PV materials
are typically used for higher operating temperatures [117].Onthe
other hand, the amorphous Silicon cells (a-Si) with temperature
coefficient of about 0.2%/K may be an option as these are more
economical than that of c-Si and triple-junction PV materials.
The heat and electricity are often supplementary to each other
on most of the cases; therefore, it is a good idea to develop a
device that can fulfill both the needs at the same time thereby,
reducing the overall cost of the system [117]. Although the basic
concept of combining the two technologies came into existence
about 40 years ago, but still it is not a matured commercialized
technology due to various constraints. However, due to the use-
fulness of the PV/T technology, the research on decreasing the
temperature of PV panel and hence, to increase the cell efficiency
Fig. 24. Small solar MED desalination unit [110].
Fig. 25. Schematic of a solar still desalination system used in the study [112].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884872

and finally to maximize the use of incident solar energy on the PV
panel is going on worldwide [118]. Work on methods to evaluate
and optimize the efficiency and performance of PV/T systems have
been carried out [119,120], also a few studies were investigating
for possible commercial applications [121,122]. During the last few
decades, several authors have developed and designed different
types of innovative PV/T collectors such as, PVT/air, PVT/water and
concentrated PV/T (CPVT) collector [123–125].
The performance evaluation of PV/T double passes facade sys-
tem for space heating applications were presented by Kamthania
et al. [126] including the detailed thermal modeling, energy analysis
of the proposed system. From the above study, the electrical effi-
ciency of the semi transparent PV module was higher than that of
the opaque PV module due to the retention of heat inthe later type,
while, the annual electrical and thermal energy was found to be
469.87 kWh and 480.81 kWh, respectively. The system was found
to be fit for space heating application as the temperature inside the
room was 5–6°C higher than that of ambient temperature during
the winter season, which exhibits a significance rise of room tem-
perature and a good indication for the real life applications. Kumar
and Rosen [127] presented the advancement in the different types
of PV/T air collector, research and development and commercial
development of the systems through a critical review on hybrid
PV/T collector especially, for solar air heating applications. They also
point out that till now most of the research concentrates on
simulation work rather than the development and commercializa-
tion of technology for long term benefits and the enhancement
techniques for the performance of these systems is also missing.
However, they projected that the PV/T technology to be a future
technology for fulfilling the thermal and electrical energy needs
simultaneously for all the sectors in the coming time.
Li et al. [128] carried out the theoretical and experimental study to
analyze the performance of the parabolic trough type concentrating
PV/T system using four different types of solar cells such as, single and
poly crystalline silicon cell, the super cells and triple junction GaAs
cells as shown in the schematic and photographic view of Fig. 28.
For the super cell array and single crystalline silicon solar cell
array, the optimum concentration ratio was found to be 8.46 and
4.23, respectively. However, for the polycrystalline solar cell array,
the performance was found to be poor at higher concentration ratio,
while, the performance of the GaAs cells was found to be better at
higher concentration ratios. The short circuit current of the single
and polycrystalline, super cell and GaAs was found to be decreased
by 0.11818A, 0.05364A, 0.0138 A and 0.00215A respectively, by each
degree increment in the temperature of the solar cell.
Calise et al. [129] worked on the energetic and exergetic analyses
of a finite-volume model of concentrating PV/T (CPV/T) system con-
sisting of parabolic trough concentrator and a linear triangular
receiver (Fig. 29) and found that the performance of the CPV/T system
is strongly dependent on the operating flow rate and the intensity of
the solar radiation. The exergy efficiency was found to be increasing
function of the mass flow rate of water increased from .03 kg/s to
0.30 kg/s and the highest efficiency was recorded at 0.300.30 kg/s of
water. However, they pointed out that such a system is very expensive
due to the fact that it consists of a triple-junction PV cell, which is
economically unfit in the present time more R&D is required to fur-
ther study it to explore the new area for such applications.
Amori and Al-Najjar [130] presented the electrical and thermal
performance evaluation of a hybrid PV/T system under the climatic
condition of Iraq taking into consideration the five different perfor-
mance parameters including maximum power point of PV, cell and
ambient temperatures, thermal gain and fill factor using Matlab
computer simulation program. The model was applied for summer
and winter days for two different cities i.e. Fallujah and Baghdad of
Iraq, respectively. The electrical, thermal and overall collector effi-
ciencies respectively, were found to be about 9%, 22.8% and 47.8% for
the summer days while, they were found to be about 12.3%, 19.4%
and 53.6% of winter days. Tyagi et al. [131] gave an overview of the
advancement in the hybrid PV/T systems, while summarizing and
emphasizing the work done on different types of PV/T collectors,
including PV/T liquid collector, PV/T air collector and PV/T con-
centrator, respectively. So far, the PV/T systems had been evaluated
for many real life applications such as, water desalination, solar still,
building integrated photovoltaic/thermal (BIPVT) solar collector, solar
cooling, etc. Although the system was found to be very useful for
both electricity and thermal energy production, but it was found that
no major steps have been taken so far for the commercialization of
this important and futuristic technology in real life applications.
Al-Alili et al. [132] had carried out the performance analysis of
high efficiency solar air conditioner driven by concentrating PV/T
system using the TRNSYS simulation program as shown in Fig. 30.
The CPV/T system is composed of a conventional vapor compression
cycle (VCC) driven by electric energy and solid desiccant wheel
Fig. 26. Principle of membrane distillation [113].
Fig. 27. Schematic drawing of the compact system (one loop desalination system
[113].
Fig. 28. The sketch and photograph of Trough Concentrating PV/T system [128],1.
Trough Concentrator, 2. Receiver, 3. Storage tank, 4. Pipe, 5. Pump, 6. Connecting
rod, 7. Supporter, 8. Push rod.
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884 873

cycle (DWC) driven by thermal energy. The better results were
found by combining the conventional VCC with DWC, although the
COP of the CPV/T powered solar air conditioner (COP¼0.68) had
been found to be better than that of the solar absorption cycle
(COP¼0.29) and VCC powered by PV panels alone (COP¼0.34).
The design and simulation model of a high temperature con-
centrating photovoltaic thermal (CPV/T) collector up to 180 °Cwas
presented by Buonomano et al. [133]. The designed system was a
combination of high efficiency triple junction solar photovoltaic cell
and a parabolic dish type solar thermal collector with dual axis
tracking arrangement which obviously can produce electrical and
thermal energy at a time. The thermal and electrical efficiencies were
found to be higher as compared to other systems, the electrical
efficiency was found to be in the range of 19–25% while, the thermal
efficiency was found to be around 60% and are applicable for the
wide range of real life applications. Yin et al. [134] designed and
evaluated the performance of a building integrated solar photovoltaic
thermal (BIPV/T) system for efficient applications in the buildings.
They presented a novel design and holistic approach to PV/T system
integrated with, a building which also have phase change material
(PCM) for energy storage (Fig. 31)andcanbeusedwhentheirra-
diance is not available or in the night time. The efficiency of the
system was found to be increased due to reduction in the tempera-
ture of PV module. Hence, the energy demand was found to be less
due to building envelops and finally the total cost and material for
the construction of the building was found to be less.
The enviroeconomic analysis and energy matrices such as, elec-
tricity production factor (EPF), energy payback time (EPBT), inflation
and life cycle conversion efficiency (LCCE) for hybrid PV/T air col-
lector was studied by Agrawal and Tiwari [135] using the overall
yearly thermal energy and exergy gain. The energy payback time had
been found to be 7.8 and 1.8 years, respectively, while the annualized
cost/kWh was found to be 15.7 Rs./kWh and 3.6 Rs./kWh respectively
for exergy and thermal energy. However, the efficiency/payback
period was found to be varying after including the cost of manu-
facturing of the components of the proposed PV/T system. Two dif-
ferent types of hybrid PVT system under four different climatic
conditions of India have been studied by Rajoria et al. [136] using
exergy and enviroeconomic approach. Out of the two designs, in the
first case, two columns each with 18 PVT modules in series are
connected in parallel while, in the second case, two columns of 18
modules each with 36 PVT tiles in the module is connected in series.
Second case had been found to be better than that of first case in all
the aspects i.e. having higher electrical efficiency (6.5%), higher
average outlet air temperature (18.1%) and lower cell temperature
(19.0%) than that of first case. The annual overall thermal energy and
exergy gain for the city Banglore was found to be higher than that of
other cities viz. Delhi, Jodhpur and Srinagar as presented in the study.
Also, the overall thermal energy and exergy gain for the month of
May was found to be better than that of other months for both the
cases. Helmers and Kramer [136] presented the linear performance
model for both concentrating and non-concentrating hybrid PV/T
system. The linear parameterizations of electrical and thermal power
outputs were derived similar to quasi dynamic model for thermal
collectors and for validating the model, the real measured data of a
CPV/T collector was used in the analysis.
Othman et al. [137] carried out the work based on air and water
as a heat carrier at Solar Energy Research Institute (SERI), Uni-
versiti Kebangsaan Malaysia on hybrid PV/T system. They carried
out the work on different types of PV/T collectors such as, double
pass PV/T collector with fins, double pass PV/T collector with fin
and CPC (Fig. 32), single pass PV/T collector with V-groove absor-
ber as shown in Fig. 33. The results showed that PV/T collector
with CPC and fins are better than that of without fins.
Recently the theoretical and experimental study on the differ-
ent configurations such as, tube and sheet based hybrid PV/T
collector has been studied by Touafek et al. [138] and showed
better heat absorption and lower cost production. Theoratical
thermal and electrical efficiency and overall effectiveness of the
PVT system had been calculated and the same was found to be
better as compared to PV alone system.
3.5. Space technologies
The Sun has unlimited power supply but the terrestrial col-
lection of solar energy has many constraints including the atmo-
spheric attenuation and weather conditions, which act as hin-
drance in the collection. However, the collection of solar energy in
space via satellite coupled with its wireless transmission to the
ground overcomes these problems but it has some serious issues
regarding technical and economical aspects. Initially the power in
space was only provided by Si based solar cells but recently the
Fig. 29. CPV/T layout [129].
Fig. 30. The solar sub-system [132].
Fig. 31. Cross section of residential system [134].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884874

high-efficiency multi-junction solar cells have been emerged as an
alternative for the space solar power [139,140]. The multi-junction
solar cells have an advantage of high energy conversion efficiency
while these are having more density and thickness and relatively
costly as compared to Si-solar cells. Therefore, the multi-junction
solar cells or the hybrid of Si-solar cells and are used when a high
amount of power with compact size solar array are needed in the
spacecraft because the larger size creates few problems for the
attitude control systems onboard a satellite.
The performance analysis, weight, area and economics of different
solar cell technologies have been studied by several authors [141–143].
Solar powered space satellite concepts have been reported in many
studies [144] including the number of recent developments in the
recent years [145,146]. Three different parameters viz. radiation
resistance, cost and energy conversion efficiency have been optimized
for the development of both types of solar cells for space applications.
The efficiency of rad-hard Si-solar cells have been found to be 17%
under the single Sun and zero air mass however, the efficiency of dual-
and triple-junction InGaP/GaAs/Ge solar cells have been reported to be
as high as 23% and 26%, respectively under the same test conditions
i.e. zero air mass and one Sun [147]. The implementation status and
testing results in developing photovoltaic arrays, microwave conver-
sion electronics, power electronics and antennas for microwave-based
“sandwich”module prototypes was presented by Jaffe et al. [148].The
modular symmetrical concentrator (MSC) architecture, solar power
satellite via arbitrarily large phased array (SPS–ALPHA) offers the
varietyofadvantagessuchasincreasedefficiency, low cost besides,
some disadvantages like thermal challenges. The schematic view of
the proposed MSC Space solar power (SSP) satellite is shown in Fig. 34.
Sandwich module as originally investigated in collaboration with
NASA/DOE in the late 1970s is the key element in the modular SSP, a
sandwich type module is shown in Fig. 35. Upper and lower radiator
surfaces are added to provide additional heat rejection in the step
module design. The benefit of additional radiator surface is strongly
dependent on the distance from the heat source, as distance increases
the benefit decreases. Fig. 36 represents the schematic view of the
photovoltaics and transmit antenna comprised of step modules.
3.6. Building integrated photovoltaic system (BIPV)
The solar PV system which is integrated as an on-site building
envelope,typically a roof and/or a facade, are known asthe building
integrated photovoltaic (BIPV) system. In other words, the photo-
voltaic cells installed either on rooftops or other parts of buildings
such as, walls, balconyor window glasses are known asthe building
integrated photovoltaic [149]. The building applied photovoltaic
(BAPV) is another term used for solar PV systems which are inte-
grated into buildings for useful application after finishing the con-
struction works. Since, more than 40% of energy and 24% of green
gases emission is contributed by buildings only [150], therefore, the
R&D on BIPV systems are going on around the world due to its dual
advantages such as, regulating the indoor environment and gen-
eration of electricity. Also, due to the ability of space in buildings,
the BIPV systems are gaining huge popularity for energyproduction
because these systems reduce the requirement of land for off-site
solar PV installations, besides, the transmission and distribution
losses [151]. So far, the most research has been focused on the
building attached/applied photovoltaic (BAPV) and the true BIPV
systems are yet to be investigated thoroughly.
The clear concept of two types of solar photovoltaic systems in
buildings such as, BAPV and BIPV was given by Peng et al. [152].
According to them, if the integration is made by installing the solar
PV modules on top of the existing structures (retrofitting) then the
system is known as building applied photovoltaic (BAPV) while, it is
BIPV if the solar PV panel is part of the building material/ element. As
of now, a few researchers have investigated the BIPV systems based
on their performance while, in most of the cases only the simulation
studies were performed. However, the existing simulation models
are still in the developing mode and further validation is required for
their applicability. Santos and Rüther [153] quantified the potential of
BIPV and BAPV generators on detached residential buildings in
Florianopolis (Brazil). They compared the performance of thin-film
amorphous silicon, and the traditional crystalline silicon solar PV
technologies annually. The typical single-family, detached home roof
covers can easily accommodate the proposed PV kits, with 87% of
these generators yielding at least 95% of the maximum theoretical
generation output of an ideally oriented and tilted PV system.
Aaditya et al. [154] carried out the real time performance assess-
ment of 5.25 kWp building integrated photovoltaic (BIPV) system
installed at Center for Sustainable Technologies, Indian Institute of
Science, Bangalore (India). The data on different parameters such as,
solar radiation, ambient temperature etc. were collected to find out
the efficiency and performance ratio of the BIPV system as shown in
photographic and schematic views in Figs. 37 and 38,respectively.The
overall average efficiency of the system, performance ratio and average
inverter efficiency was found to be, respectively, found to be 6%, 0.5
and 91% for the period May 2011 to April 2012. However, the perfor-
mance of the BIPV system does not find coinciding with the output
and efficiency of the system because for lower output and the higher
average efficiency and vice-versa. The comparative studies on long
term surface temperature characteristics of amorphous silicon based
Fig. 32. Schematic diagram of double pass PV/T [137].
Fig. 33. Schematic diagram of the PV/T collector with V groove absorber collector [137].
Fig. 34. Modular Symmetrical Concentrator architecture [148].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884 875

BIPV windows and normal clear windows using mock-up test facility
were studied by Yoon et al. [155]. The year round data were collected
for clear double windows and BIPV double windows at an inclination
angle of 0°,30°,and90°sky day and was analyzed using various
statistical tools. The temperature of the window was found to be
increased for vertical plane in winter season while, for summer season
it was found to be enhanced for horizontal and inclined plane. The
surface temperature of BIPV window was found to be lower by 1.0 °C
in the summer season while, it was found to be higher by 2.0 °Cinthe
winter season as compared to that of the normal window, respectively
and hence, reveals a very important result about the advantage of PV
systems being used in the buildings and its role in maintaining the
thermal comfort.
Koyunbaba et al. [156] presented the comparative study on
simulation and experimental results of energy modeling of BIPV
trombe wall system in Izmir (Turkey). In this case they applied
computational fluid dynamics (CFD) to study the temperature and
velocity distribution in the test room model. The results between the
simulation and experimental values for surface temperatures of PV
module, thermal wall; indoor, inter-space, inlet and outlet air were
found to be in a good agreement which exhibits the authentication of
the results. The daily average electrical and thermal efficiency of this
experimental system was found to be 4.52% and 27.2%, respectively.
Ng and Mithraratne [157] examined the six commercially available
semi-transparent BIPV modules for window application under the
climatic conditions of Singapore on the basis of life cycle environ-
mental and economic performance. They suggested that for urban
areas where buildings have very less area but large façade, semi-
transparent BIPV windows are good option for BIPV applications.
4. Advances in performance study of solar PV systems
The growthrate of the photovoltaic industry has been increasing
annually due to the government support, installation of the grid
connected plants and residential rooftop program globally. The
public, private and government sectors around the world are pro-
moting the solar energy based power plants to increase the share of
renewable energy based electricity production for real life appli-
cations leading to the sustainable development, while keeping the
environmental aspects as a priority. Most of the countries are pro-
viding incentive for solar in particular and renewable energy based
energy production in general to reduce the burden on the envir-
onment. During the recent past, the installations of several major
projects related to the grid connected PV plants have been com-
pleted and some more are in the pipeline and also increasing
continuously. This section of the paper provides the performance
study of the PV cells and installed PV system performance study in
different countries including the energy and exergy analysis [158].
The performance study of a grid connected photovoltaic system
of 200 kW at Jaen University was done by Drif et al. [159]. The major
objective of the said project was to integrate a medium scale PV
plant into the University campus for R&D activities and its perfor-
mance evaluation. The total capacity of the PV system was around
8% of the total electricity demand of the University. They studied
the performance of the system during 2000–2003 and found that
system 1 (70 kW) and system 3 (20 kW) showed good behavior in
comparison of system 2 (70 kW) and system 4 (40 kW). After the
evaluation of the data, they found that the average annual energy
production registered was around 168 MWh per year, which is
around 6.4% of the total power consumption of the University.
Congedo et al. [160] studied the performance measurements of
mono crystalline silicon PV modules installed in South-eastern Italy
with a total capacity of 960 kWp in the two lots (353.3 kWp and
606.6 kWp). They analyzed the energy and power generated, final
yield, photovoltaic system efficiency, performance ratio and cell
temperature losses in two different angles. The result of this study
showed that the PV system efficiency vary between the highest
Fig. 35. Depiction of the functional layers of the sandwich module [148].
Fig. 36. Photovoltaic and transmission antenna comprised of step modules [148].
Fig. 37. BIPV system under study [154].
Fig. 38. Schematic diagram of the BIPV system [154].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884876

valueofabout17%inspringtothelowestvalueofabout15%in
summer, and the performance ratio reaches the maximum level of
86.5% in March to the minimum level of 79% in June. On the other
hand, the cell temperature losses were recorded to an absolute
minimum of 3.5% in October to an absolute maximum of 8% in
June. From the investigated result, they found that the system has
good levels of performance, typically of 80%, and sometimes higher,
also the values of final yield and reference yield were found to be
above the average measured values in other PV systems.
Pietruszko and Gradzki [161] have monitored a small grid
connected PV system consists of 20 double-junction thin-film
amorphous silicon PV modules of 1.0 kW each manufactured by BP
Solar, which was kept on the rooftop of the building at Warsaw in
Poland for a period of one year. They monitored different para-
meters, i.e. DC and AC voltages, DC and AC currents, AC power,
cumulated AC energy supplied to grid, daily AC energy production,
utility grid impedance, solar irradiance on a horizontal plane,
irradiance on the PV array, ambient temperature, PV module
temperature and wind velocity. They plotted the graph for output
power versus solar irradiance and found that the power output
increases linearly with the irradiance as shown in Fig. 39. Also the
efficiency of the PV modules was found to be in the range of 4–5%,
while it was observed to be slightly higher, i.e. around 6% under
the standard test condition (STC), which is an obvious case in most
of the application of the experimental devices. As a result, the
production of energy was found to be around 830kWh during the
period of first year operation which is also found to be higher than
that of the simulated result of the above mentioned installed PV
system. Also the efficiency drop of the system may be due to some
common reasons such as, high temperature of the module, low
irradiation level and deposition of dust particles on the PV module.
Leloux et al. [162] presented a detailed review and analysis
based on the operational data of 993 PV plants installed on the
residential buildings in Belgium following three key approaches i.e.
the level of energy production, the level of performance and the key
parameters which influence the quality of such plants. After the
analysis, they found that the optimally oriented PV system produces
a mean annual energy of around 892 kWh/kWp for the middling
commercial plant, as can be seen from Fig. 40. It is also found that
the optimally oriented PV systems can produce around 6% more
energy as compared to that of the generally orientated PV gen-
erators as a whole. The mean performance ratio was found to be of
78%, while the meanperformance index was found to be of 85%. It is
also found that on an average, the real power of the PV modules
falls around 5% below the corresponding nominal power mentioned
by the manufacturers on their datasheet. In some of the cases, the
difference between the real and nominal power was observed up to
16%. Finally, it was concluded from this study that the energy pro-
duced by a typical PV system in Belgium is around 15% inferior to
the energy produced by a very high quality PV system.
Another study was performed on the energy production in France
[163] during the year 2010 by the same group exhibits that 78% of
the installed PV systems are made from classic crystalline silicon, 17%
are from of HIT, 2% are from amorphous silicon, 2% are from made of
CIS and another 2% are made from CdTe, while the total annual
energy production was found to be around 1163 kWh/kWp. They
concluded that in general, the energy produced by a typical PV sys-
tem in France is around 15% inferior to the energy produced by a very
high quality PV system at the same location, which is also found to
be similar to that of the Belgium case, mentioned above. Again, the
real power of the PV modules was found to be around 4.9% below
than that of the corresponding nominal power mentioned on the
manufacturer's datasheet on an average. Also the PV systems equi-
pped with heterojunction with intrinsic thin layer (HIT) modules
exhibit the higher performance than the average vale, while on the
other hand, the systems equipped with the copper indium (di)
selenide (CIS) modules exhibit around 16% lower real power than
that of their nominal values.
Sastry et al. [164] conducted a performance study and quality of
on mono crystalline PV module after being exposed to the outdoor
environment for around ten years continuously at a typical loca-
tion in northern part of India. They tested more than thirty five
different types of PV modules supplied by more than different
eleven manufacturers and the photographic view of the outdoor
test bed at Solar Energy Centre (Gurgaon) India is shown in Fig. 41.
Out of total thirty five modules, thirty modules were installed
outdoor, while another four modules were kept a spare and one
model was used as a reference module. As usual, the voltages, cur-
rent and power output from PV are the parameters that have been
taken into account here just like other project and all the PV modules
were grouped under certain category. Based on their analysis, it was
observed that after ten years in continuous use, the power output
from group 1 and 2 degraded by 10%, while for group 3 and 4 it was
found to be lower by 28% on an average, as can be seen in Fig. 42.
Sasitharanuwat et al. [165] evaluated the performance of a
10 kWp PV system for an isolated building in Thailand for a period of
6 months. The system was comprised of an array having three dif-
ferent types of PV modules consisting of amorphous thin film of
3672 W, polycrystalline solar cell of 3600 W and the hybrid solar cell
of 2880 W, respectively and making up a total peak power of
10.152 kW. After studying the system for six month continuously,
they found that all the components and the system performed
effectively and generated about 7852 kWh of energy with an average
daily production of 43.6 kWh. The average efficiency of the amor-
phous thin film panel, polycrystalline panel, hybrid solar cell panel
and entire PV panel system was found to be 6.26%, 10.48%, 13.78%
and 8.82%, respectively. A performance study for 120 kWp PV system
Fig. 39. Output power vs. irradiance for August 2001 [161].
Fig. 40. PV systems production in 2009 [162].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884 877

using poly crystalline type PV module installed at SRET, Naresuan
University, Thailand was also done by Chimtavee et al. [166].Inthis
study, the data on irradiation, module temperature, voltage, current
and power has been monitored from November 2008 to October
2009 and results for energy output and efficiency are given in Fig. 43.
The result exhibits that the high solar radiation on an average of
5.50 kWh/m²was received during the winter and summer seasons,
while during rainy season it was around 4.81 kWh/m²on an average
per day. On the other hand, the efficiency of the module was found to
be 11.66% and 11.81% during the winter and summer season,
respectively.
Rustu and Huseyin [167] analyzed the performance of a multi
crystalline Si PV module on monthly, seasonal and annual basis
under the climatic conditions of Mugla in Turkey. The data during
the monitored period from the site showed that the annual total PV
module plane of array or in-plane (POA) irradiance, electricity
generation and the average efficiency of the module were found
to be 1963.90 kWh/m
2
, 182.83 kWh and 9.54%, respectively. The
monthly total generated electricity of the PV system was found to
be varying between 78.47 kWh/kWp during the month of Decem-
ber to 206.19 kWh/kWp duringthe month of August, while the total
annual generated electricity was found to be 1741.24 kWh/kWp.
Ying Ye et al. [168] studied the outdoor performance of PV module
for tropical climatic condition like Singapore where more than half of
theirradianceisclassified as the fluctuating irradiance. The data was
collected with the fluctuating irradiance between high and low irra-
diance using typical meteorological day (TMD) irradiance data as the
base. The monitored data of five different PV module technologies
over a period of one year starting from January to December in 2011
was used to study the performance of different PV module technolo-
gies including the short-circuit current, module temperature and
average efficiency under the fluctuating irradiance. In this study, the
average efficiency of mono c-Si modules was found to be affected
mainly by the module temperature, while the efficiency for a-Si thin-
film modules showed a much stronger dependency on the irradiance
level than that of the fluctuations in the radiation and/or the module
temperature. Also the micromorph Si module showed similar char-
acteristics as mono c-Si for high irradiances including temperature
dependency having a lower efficiency for low irradiances, which has
possibly caused by the internal current mismatch between the bottom
and top cells. The method proposed in the study allows a deeper
insight into the dependence of module performance on the fluctuating
irradiance conditions, which is very important, especially for the tro-
pical regions where the radiance exhibits the high level of variability.
So et al. [169] conducted performance analysis of 3 kW PV
modules for one year in which 2 modules are made from the mono
crystalline silicon cell and another 2 modules are made from the
poly crystalline silicon cell. All the PV modules were installed at
Field Demonstration Test Center in Korea during November 2002
until October 2003. They monitored different parameters includ-
ing the voltage and current for AC and DC, irradiation and the
temperatures for ambient and PV panels, while the monthly
power output for every PV system is shown in Fig. 44. From Fig. 44,
it is seen that all the PV modules exhibit a drop in energy output
during January due to snow fall and during July due to cloudy
weather and the conversion efficiency for all the systems was
found between 9.2% and 10.1%. This study also indicated that the
power output from the PV module strongly depends on the
ambient temperature, irradiation level, dust level of environment
and shading of PV module, the overall, PR for every PV system in
this study was found to be between 63.3% and 75.1%.
The performance evaluation of a 5.28 kW off-grid photovoltaic
system in Saudi Arabia was carried out by Rehman and El-Amin
[170] by collecting the experimental data for PV panel surface
temperature, solar radiation and power output with the help of
sensors and data loggers. They studied impact of the effect of PV
surface temperature and dust collected on the panels for the power
output of individual arrays and total power from complete plant.
The result showed that the hourly mean energy yield was found to
be decreasing with increasing the surface temperature of the PV
panel during the months of July and August. The daily energy yield
also showed a decreasing trend with days of the month which
could be accounted for dust accumulation on the PV panel surface.
The study of a grid connected PV system was carried out by Li
et al. [171] in Hong Kong by systematically recording and analyz-
ing the technical data including the available solar radiation and
the output energy. In this study the PV modules covering the total
area of 6.75 m
2
were tilted by 23°and the performance was ela-
borated in terms of energy, environmental and financial aspects.
After the evaluation of experimental data, it was found that the
monetary payback period (MPBP) for the PV system is of 72.4
years, if the electricity buying price is equal to the electricity
selling price. If carbon trading was considered, the payback period
was shortened to be of 61.4 years. The embodied energy payback
period (EEPBP) was estimated to be 8.9 years, while the average
conversion efficiency of the system for 2 years was found to be
11.9%, whereas the graph of energy output for twelve months is
shown in Fig. 45. They concluded that these findings would be
very useful for planning the grid connected PV installations and
are applicable for other places having similar architectural layouts.
Elhodeiby et al. [172] conducted a performance analysis of a
3.6 kW grid connected thin film PV system in Cairo, Egypt by
monitoring the system for a complete year starting from Jan 2010
until Dec 2010. Total 90 PV numbers of modules were installed on
the roof of renewable energy shop in Cairo covering the total area
of 70 m
2
. The average energy generated from PV module is given
in Fig. 46, while the PV system was installed at angle 35°facing
south. It was found that the maximum irradiation of 7.1 kWh/m
2
/
day was received in the month of June, while the minimum irra-
diation received was of 4 kWh/m
2
/day in the month of December.
The highest system efficiency was observed to be of 4.8% in the
month of January and the average efficiency for the whole year
was found to be of 4.02%, while the average efficiency for PV only
was found to be of 4.22%. They concluded that the cumulative
energy produced is higher than that of the simulation based
energy production with a total of 5712.25 kWh which is due to the
fact that the availability of higher solar irradiation has helped in
optimizing the power output from PV even with the higher
ambient temperature and lower wind velocity.
Ayompe et al. [173] performed a study on 1.72 kW PV system in
at a typical location of Dublin in Ireland with latitude and longitude
of 53.4°N and 6.3°E, respectively, by monitoring the system for a
Fig. 41. PV system setup [164].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884878

year during November, 2008 to October, 2009. Total eight PV
modules made from mono crystalline silicon and manufactured by
Sanyo [country] were used in this project were installed on 12m
high building tilted at 53°,whiletheefficiency of the modules was
found to be 17.2% under standard test condition (STC). The PV is.
From the results, the maximum energy generated was found to be
in the month of May and June due to the availability of the higher
irradiation during these months, while the lowest energygenerated
was found to be in the month of December due to higher wind
speed and lower irradiation, whereas the performance study is
shown in Fig. 47. The annual total energy generated was found to be
of 885.1 kWh/kWp, while the annual average daily final yield,
reference yield and array yield were found to be 2.41 kWh/kWp/
day, 2.85 kWh/kWp/day and 2.62 kWh/kWp/day, respectively. The
annual average daily PV module efficiency, system efficiency and
inverter efficiency were found to be 14.9%, 12.6% and 89.2%
respectively, while the annual average daily performance ratio and
capacity factor were found to be 81.5% and 10.1%, respectively.
Jo et al. [174] studied the utility-scale grid connected solar
photovoltaic systems and the optimum amount of solar PV energy
generation for the state of Illinois in USA. They found that the
overall electrical generation from the installed PV systems at the
level of the current solar carve out of 6% of the state's RPS would
be fully utilized and none would be wasted. By dividing the state
into two different regions based on the existing power utilities in
the state, PJM and MISO, and taking into account the data on their
respective weather patterns, they estimated the regional potential
more accurately. The solar carve-out of 6% for the PJM region was
found to be close to the level at which the generated electricity can
be fully utilized. For the MISO region, it was found to be of 7.2% to
reflect a 100% utilization potential of the solar PV systems.
Fig. 42. Defects in PV module after long term outdoor performance [164].
Fig. 43. Energy output and efficiency result [166].
Fig. 44. Monthly output energy from PV system [169].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884 879

Similar performance and economical analysis of grid-connected
photovoltaic systems in Daegu, South Korea was carried out by Kim
et al. [175]. They performed for two plants one system at Dongho
elementary school was of 25,848 kWh and the other system at Osan
building was of 40,094 kWh. The annual power generation efficiency of
each photovoltaic system was found to be of 10.8% for Dongho ele-
mentary school, whereas for Osan building it was found to be of 13.8%
higher than the former. The Osan building system showed a better
economic efficiency as the unit power production cost of the photo-
voltaic system was $0.824/kW for Dongho Elementary School and
$0.531/kW for the Osan Building. The different PV module perfor-
mance was also presented by Ueda et al. [176] for a grid connected
residential area in Japan for various configurations of the PV system
including single-array-oriented south, multiple array-oriented south
and/or east and/or west and arrays not oriented south. The objective of
this project was to analyze the performance and loss for different
configurations as shown in Fig. 48 and compare them with one
another by collecting the data during July 2006 to June 2007. The
parameters that have been looked into are the temperature, power
output, current, voltage and irradiation. From the study, they concluded
that the south oriented configuration produced around 11–22% more
power as compared to the other configurations, mentioned above.
Hajiah et al. [177] carried out the performance study of grid-
connected PV system for the two different sites namely, Al-Wafra and
Mutla in Kuwait by collecting meteorological data for three years and
analyzedthe100kWpgrid-connectedPVsystemproposedforboth
sites. The proposed systems showed the higher energy productivity,
whereas the annual capacity factors for Mutla and Al-Wafra were
found to be of 22.25% and 21.6%, respectively. Also the annual yield
factors for Mutla and Al-Wafra were found to be of 1861 kWh/kWp/
year and 1922.7 kWh/kWp/year, respectively. On the other hand, the
cost of the energy generated by both systems was found to be of
about 0.1 USD/kWh which is very close to the price of the energy
sold by the Ministry of Electricity and Water (MEW) in Kuwait.
Furthermore, it was also found that the invested money could be
recovered during the assumed life cycle time, whereas the payback
period for both sites was found to be about 15 years. Mondol et al.
[178] presented the long term comparative study for grid connected
PV system using TRNSYS simulation tool. Over the simulation period,
the average monthly errors between measured and predicted PV
output before and after the modification of the TRNSYS model were
found to be of 10.2% and 3.3%, for the isotropic sky model and 15.4%
and 10.7% for the anisotropic sky model, respectively. The predicted
PV performance parameters were found to be in good agreement
with the measured parameters during the high insolation months,
but for the low insolation months, the deviation was found to be
larger. The predicted parameters differed by 1–2% for an isotropic
and an anisotropic tilted surface radiation models. The results
showed that the relationships developed using long term perfor-
mance data improved the accuracy of the simulation model.
The performance of the 500 kW grid connected photovoltaic system
in Son Province, of Thailand was carried out by Chokmaviroj [179].The
system consists of a photovoltaic array having 1680 modules (140
strings, 12 modules, 300 W/module) with power conditioning units and
battery converter system. During the first eight months of the operation,
the PV system generated about 383,274 kWh of energy with an average
production of 1695.9 kWh ranging from 1452.3 to 2042.3 kWh per day.
The efficiency of the PV array system was found ranging from 9% to 12%,
while the efficiency of the power conditioning units (PCU) was found to
be in the range of 92 to 98%. A pilot PV grid-connected system rated at
36 kWp has been designed and studied by Al-Sabounchi et al. [180] at
the Abu Dhabi distribution network. The performance of the system
was evaluated in terms of power and energy production, conversion
efficiency, consistency of voltage and frequency, along with the impact
of ambient temperature under the actual weather conditions. Addi-
tionally, the influence of accumulated dust deposition on the production
of the PV array has been also evaluated. The evaluation showed con-
sistent operation of the system with a moderate conversion efficiency
even with the higher ambient temperatures at the site. However, the
dust deposition on the glazing of PV modules was found to seriously
degrading the performance of the PV system. They found that the
highest reduction up to 27% in power production was recorded during
the month of July due to the accumulated dust deposition. This may
lead to a conclusion that, for a reasonable amount of PV power pro-
duction in the climate of Abu Dhabi, it is appropriate to perform a
monthly cleaning of the surface of the PV modules.
Mondal and Islaml [181] studied the potential and viability of grid-
connected 1.0MW solar PV generation plant in Bangladesh. The esti-
mation of the potential of power generation of gird-connected solar PV
Fig. 45. Output energy for 12 months [171].
Fig. 46. Averaged energy generated from PV module [172].
Fig. 47. PV performance in Dublin [173].
Fig. 48. PV module configuration [176].
A.K. Pandey et al. / Renewable and Sustainable Energy Reviews 53 (2016) 859–884880

in Bangladesh was about 50174 MW. They found that the annual
electricity generation of the proposed solar PV system varies betw-
een a minimum of 1653 MWh/year at Barisal with a maximum of
1844 MWh/year at Dinajpur. The per unit electricity production cost
from the system was found to be varying from 13.25 to 17.78 BDT
which is quite competitive with grid-connected fuel-oil based power
generation of around 15 to 18 BDT per unit. If clean development
mechanisms (CDM), carbon tax, and oil price fluctuation are taken into
consideration, the unit cost would be lower than that of the grid
connected fuel-oil based power generation. Also condition was found
to be favorable based on all economic indicators for the development of
the proposed 1.0 MW grid-connected solar PV system in Bangladesh.
Paudel and Sarper [182] presented the economic analysis of a
1.2 MW capacity grid-connected photovoltaic power plant installed
at the Colorado State University, Pueblo in USA. The project was
commissioned by a regional utility company as per the renewable
energy portfolio standards guidelines of the state. The system was
installed on the customer's property funded by a third party
investor who will receive the tax credits and rebates in addition to
the monthly revenue from the energy sales. After the performance
of the PV system analysis, the amount of energy generation and
project investment costs and revenues, suitability etc. shows the IRR
of the project is around 10.7% for the given tax credits and rebates.
For the favorable condition of PV project installation, at least 4% tax
credit is required to have a breakeven of the project. The first zero-
energy office building in Singapore uses photovoltaics to meet its
energy target. Wittkopf et al. [183] studied the 142.5 kWp grid-
connected rooftop PV system to meet the zero energy building
system in Singapore. The analysis is based on the eighteen months
of operation which is the guidelines of the IEC standard 61724 for
measurement, data exchange and analysis. The performance ana-
lysis showed the good overall performance ratio of 0.81 and the
overall inverter efficiency of 94.8%. The system and array efficiencies
were found to be of 11.2% and 11.8%, respectively, as compared to
the nameplate PV module efficiency of 13.7%. They also studied for
impact of shading, orientation/tilt, and PV module temperature.
The economic performance and policies for grid-connected
residential solar PV system in Brazil was studied by Mitscher
[184]. The analysis was done for economic competitiveness of grid-
connected, distributed solar photovoltaic generation through small-
scale roof top installations in five Brazilian state-capitals. The
locations represent a comprehensive set of the two essential para-
meters for the economic viability of solar PV, irradiation and local
electricity tariffs. The analysis comprises three different interest rate
scenarios reflecting different conditions for capital acquisition to
finance the generators; subsidized, mature market and country-
specific risk-adjusted interest. Using the subsidized interest rates,
the analysis showed that solar PV electricity is already competitive
in Brazil, while in the country-specific risk-adjusted rate, the
declining, but still high capital costs of PV make it economically
unfeasible. They also demonstrated the high potential of distributed
generation with photovoltaic installations in Brazil, and found that
under certain conditions, the grid-connected PV can be economic-
ally competitive in a developing country, like Brazil.
5. Conclusions and recommendations
Based on the study summarized in this article, the following
conclusions are drawn, while some recommendations are also made
for the future research based on the conclusions, as given below:
5.1. Conclusions
This article presents the recent advances in solar photovoltaic sys-
tems for emerging trends and advanced applications and performance
analysis of the solar photovoltaic systems. The recent developments
in the research on different applications such as, water pumping, home
lighting, space technology, building integrated PV systems, concent-
rated PV, desalination and photovoltaic thermal have been revie-
wed and presented. The PV/T, BIPV, desalination and CPV applications
of solar PV are found to be most emerging applications and needs
further R&D to make them economically competitive at the user end.
Temperature enhancement in concentrating the light in CPV system is
found to be major challenge. This increase in the temperature reduces
the efficiency of the PV and hence degrades the performance of the
overall PV system. Therefore, it is necessary to investigate other options
of reducing the temperature of the CPV than conventional one. It is
found that most of the study is on air or water as a medium at the back
of the PV panel is currently being used for the regulation of tem-
perature. Concentrated PV/T (CPV/T) systems may be an efficient
option for harnessing heat and electricity at the same time particularly
in the low solar radiation areas. The BIPV systems will play crucial role
in the energy solution due to its bi-advantages such as electricity
production and reduction in the material cost of the building. Because
of the modular nature of solar PV systems, it is very useful for water
pumping and home lighting, especially in the rural areas where grid
connectivity is the problem. Solar PV desalination systems are found to
un-economical and not commercialized yet, but shows good potential
for providing fresh water for rural as well as urban areas in the coming
time. Application of solar PV systems in the space is very old, however,
needs further R&D in discovering new solar cell materials for the
efficiency enhancement and hence a reductionintheareaofthe
module. This paper would not only be useful for the researchers, aca-
demicians, manufactures, but also for policy makers.
5.2. Recommendations
After the rigorous literature review on different aspects of
applications of solar PV systems, few PV systems such as PV/T, BIPV,
CPV and PV powered desalination systems are found to be potential
applications of PV and are capable of fulfilling the future energy
solutions. Also, it is recommended to put more efforts in developing
the PV/Tand CPV systems having thermal energy storage and which
can be commercialized as these are not commercialized yet. The
BIPV being used in the buildings and require no extra space for the
installation, which is a critical issue for the PV systems, can be
focused more. Therefore, it is recommended to put on more R&D
efforts in the efficiency improvement on PV/T, BIPV, CPV and PV
powered desalination systems to make them not only technically
but also economically competitive for real life applications.
Acknowledgments
The authors (A.K. Pandey and N.A. Rahim) are thankful to the UM
Power Energy Dedicated Advanced Centre (UMPEDAC) and Institute of
Graduate Studies (IPS), University of Malaya, Malaysia, for funding this
research work through the research Grant (UM.C/HIR/MOHE/ENG/32).
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