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India Solar Photovoltaic (PV) Panels Selection Guide – understanding system quality

By on April 22, 2016

Our country is supposed to be one of the few countries, which is blessed with abundant solar energy. There is a tremendous scope for the growth for the Indian Solar Market. However, two factors which affect the same growth according to us are, lack of proper knowledge about the solar power technology amongst the consumers and penetration of ‘not so good’ quality products in the market. Hence, we at Bijli Bachao, thought of starting a series of articles where we will be trying our best to explore various concepts about solar power technology and help the consumers make an informed choice of good quality products.

To start with, lets first have an overview about solar photovoltaic systems. Kindly have a look at this video for better understanding of the same.

(the above video gives an overview of the components in a solar pv system. The actual working differs from system to system. Refer our article Solar electric, solar thermal, power generation, inverters, grid, off-grid: clearing the cobweb for further understanding)

In this article, we will be focusing on solar photovoltaic (PV) panels.

‘Photovoltaic’- what is it?

To explain in one line: Photovoltaic is the conversion of light (photons) into electricity (volt).

For all those curious minds that wish to know how this actually works, we have included a video from YouTube to help you understand the process in a better way.

You can find the same here:

For more technically curious minds, follow this video:

Types of photovoltaic panels

Without going into the details of individual types, the table below will give you a comparison between various types of solar photovoltaic panels

Sr. noPropertyMono CrystallineMulti/ PolycrystallineThin Film (CdTe, CIGS, Amorphous crystalline etc)
1EfficiencyHighestModerate (13-15%)Lowest
2CostHighestModerateLowest
3Area occupied per kWLowestModerate (apprx 100 sq.ft)Highest
4High Temperature PerformancePoorPoorBetter
5Generation in diffused lightAverageAverageBetter

In India, the most commonly available panels are polycrystalline/ multi-crystalline.

Now, before we have a look at what factors will differentiate solar PV panels based on quality, let us first analyze what factors affect the performance of solar panels based on Indian conditions.

Sr. NoFactorComments
1DirectionFor panels that have fixed position without any sun tracking mechanism, they should face south direction for better output throughout the year.
2Tilt/ Angle of InclinationPreferably according to the latitude of the place
3ShadingEven a small part of shaded panel, affects the entire output of the panels to a great extent. Ensure the panels are placed such that there is no shadow on them throughout the day. Even a single partially shaded panel affects the output of all other solar panels in the system. Also, ensure that there is no dust etc on the panel to avoid shading.
4TemperatureHigher the temperature, lower will be the output from solar panels. Usually, panels are rated according to standard test conditions (i.e temperature: 25 degree Celsius, insolation 1000W/m2, Air Mass: 1.5). Hence, if temperature is higher than this, your panels may give less than rated output.

Now, let us understand how quality of solar pv panels can be determined by looking at their datasheet. We request the readers to ask for the datasheet of the panels they wish to buy and verify the following factors.

Tolerance of solar panels: Over promise and under deliver, not acceptable

A solar panel rated at say 100 Watts should give at least 100 Watts under standard test conditions. However, if the manufacturers say that their panels have a tolerance of +/- 5%, it means the same panel can give either 105 Watts (acceptable) or even 95 Watts (not acceptable). Ensure that your solar panel will always have ‘positive tolerance’ mentioned on the datasheet.

Temperature Co-efficient of solar panels: Stability is always preferred

As mentioned above, temperature affects the output of solar panels.

As temperature increases from 25 degree Celsius: current increases, voltage decreases, power decreases. And vice versa.

Now the extent to which this increase/decrease takes place is given in terms of temperature co-efficient as percentage change per degree of temperature change (eg. Power change = -0.04%/degree Celsius).

Hence if temperature is say 40 degree Celsius, then rise in temperature from 25 degree Celsius is 15 degree Celsius. Hence, power will decrease by 15*0.04% i.e. 0.6% from its rated power.

Lower the value of this temperature co-efficient, better stability the panel will give under different operating conditions.

Efficiency of solar panels: More efficient, more power in less space

The efficiency of solar panels is the amount of electrical output it can give for the amount of solar radiation falling on it per meter square. For example: consider a solar panel with efficiency 14% and area 1.5 m2. If the amount of solar radiation falling on this panel is 1000W/m2, then this panel is capable of producing

1000*14%*1.5 = 210W

If this energy falls for 5 hours, then this panel will produce 210*5= 1050 Wh or 1.05kWh in a day. Higher the efficiency, higher will be amount of energy generated per unit area. So efficiency matters if you have limited space for solar panel installation and in such a case it is better to go for higher efficiency solar panel.

Approvals/Certifications for solar panels: A very important factor

Approvals and Certification are very important as they ensure that the solar panels meet a minimum amount of performance and safety conditions. This factor is very important as it will clearly eliminate low quality products from the lot.

For India, Ministry of New and Renewable Energy (MNRE), mandates the following certifications for solar panels

For crystalline silicon terrestrial PV modules: IEC 61215/ IS 14286

For thin film terrestrial PV modules: IEC 61646

Also, the panels must conform to IEC 61730 part I requirements for construction and part II requirements for testing, safety qualification

For highly corrosive atmosphere (coastal regions etc) the panels must qualify Salt Mist Corrosion Testing as per IEC 61701/ IS 61701.

Kindly ask your supplier to present these test certificates and also check the validity of these certificates. If the quality is genuine, it won’t be difficult to get these certificates.

Warranty and Guarantee of solar panels: Shows the confidence in the product

Since you invest a good amount to install a solar power system, its always good to assure that the system will function properly for the next 15-20 years. Usually Indian Manufacturers give warranty in the range 1-5 years and performance guarantee as follows:

90% of the rated output for 1st ten years

80% of the rated output for next ten years.

This obviously varies from manufacture to manufacture or product to product. Some manufacturers also give linear performance guarantee, which is even better.

It is always preferable to check the warranty and also the terms and conditions for the same, since you won’t like the system to fail and bear the subsequent losses.

Practical is always better than theory

It is true that the above factors can be known by only looking at the datasheet. However, there are certain factors, which you can test while purchasing the solar panels. They are Voc– Open Circuit Voltage and Isc– Short Circuit Current (click on this link to read more about these concepts: Solar Glossary – photovoltaic, panels, modules, cells, voltage, watt and current). The manufactures/ suppliers may possibly write exaggerated values of current and voltage to sell their products. However, it is always a good idea to practically check whether these values match actual output and ensure that you buy the appropriate panel. All you need is a good multimeter.

To know how to test a solar pv panel, kindly check this video:

Please note, that you do this under some safety precaution or get it done by some qualified person. Also note that while connecting and disconnecting the wires, the solar panel has to be shaded (like shown in the video).

Having said that, we would like to mention that this article aims to compare only the quality of solar pv panels. Kindly note that the size of the panel you select and how you install it, also affects the output of the system. We will surely cover these factors as well in subsequent articles on designing and installation.

We hope that this article helps you to identify and compare the quality of solar panels based on a few basic concepts.

Here is a quick video that can guide you on Rooftop Solar PV buying in India:

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112 comments

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1

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PRASANTH BATTULA

sir, I have designed a system for 43 units output per day. For that, I need a 15.6kwp capacity of PV array. Where the solar insolation is 4.5hrs. This system will give an output of 9.6kwp.
When I calculating payback period for this I am getting 20 years which is very high. I don't know where I have done wrong. Please help in calculating the payback period. (where the utility cost for 1 unit is 4.3rupees. and backup units required with battery (autonomy 3days) is 6.3kwhrs.

5

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6
PRASANTH BATTULA

Sir, You told that (in the video) for the 1kw solar system it costs 1,00,000 rupees with battery. The 1,00,000 rupees for 1kw output power or 1kw solar array capacity.
Because the 1kw solar array output will be = 1kw*0.85*0.9*0.95*0.85 = 0.61kw
where pv array output efficiency = 85%
charge controller efficiency =90%
inverter efficiency = 95%
battery efficiency = 85%
Please help me.

7
Abhishek Jain (Mod)

1,00,000 Rs for a system with 1 kW solar array + inverter + batteries + accessories. It is not output.

8

AURA ENERGY
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9

AURA ENERGY
We are seeking financial sound dealer , distributor, channel partner etc. in West Bengal, Bihar, Assam, North East, MP, Chattishgarh, Telengana, AP, Tamil Nadu, Orissa etc. to sale and distribution of our various solar products , solar home light system, solar hybrid inverter, solar roof top, solar industrial solution etc. Please email us [email protected], [email protected]

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Whatsapp - 8697000196

11

AURA ENERGY
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12

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13
Abhishek Jain (Mod)

I have not heard much about them.

14
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15

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16

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17

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18

WELCOME TO AURA ENERGY

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We are Solar EPC company and we can provide

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-On grid(with net metering)
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-solar hybrid inverter
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-solar water heater etc.
B Sen
Aura Energy
contact me at [email protected]

Call - 8697000196
Whatsapp - 8697001085

19

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20

sir i have 6 panels of 300 watts each (configurations pmax 300wp Vmp 37.00v Imp 8.12A Isc 8.83A Voc 45.00V fuse rating 15A each panel) pl advise how can i use these panels with a 24v 1600va microtec solar inverter with 2 160ah batteries. should i use mppt charger.i want to use this set up for my house to run 1tv 5 led bulbs 9watts each 5 fans a laptop

23

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24

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25

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26
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27
Abhinandan Choudhary

We are Solar EPC company and we can provide

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28
krishna shrivastava

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29

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30
krishna shrivastava

Where From you

31

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32
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33

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34
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35

We are an Solar EPC company and we can provide

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-On grid(with net metering)

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Solar street light 24w

solar water heater and etc.

contact me:

[email protected]

Phone/WhatsApp : +91 - 9953384191

36
Abhinandan Choudhary

We are an Solar EPC company and we can provide

solar Rooftop system

-On grid(with net metering)

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-solar water heater etc.

contact me at [email protected]

call/What's app +91-7042435795

37

We are an EPC company and can provide

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Net metering

Solar street light 15w to 120w

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or call +91-9953384191

38
Abhinandan Choudhary

We are Solar EPC company and we can provide

solar Rooftop system

-On grid(with net metering)

-Off grid(with battery)

-Solar street light

-solar water heater etc.

contact me at [email protected]

or call +91-7042435795

39
Abhinandan Choudhary

We are an Solar EPC company and we can provide

solar Rooftop system

-On grid(with net metering)

-Off grid(with battery)

Solar street light

solar water heater etc.

contact me at [email protected]

or call +91-7042435795

41

Hi, I am from Mangalore, in our house we have a well where the water level is just 10-15 feet below ground level. I want to install a low capacity solar pump (0.25 hp) for watering our garden during day time. Can anyone suggest the number of solar panels required and the total cost involved. I don't want to use battery /inverter.

42

We are an EPC company and can provide

solar Rooftop

On grid

Off grid

Net metering

Solar street light 15w to 120

solar water heater and etc.

all kinds of solar power plants PAN INDIA,

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or call +91-9953384191

43

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44

Interested in installing a 100kW solar plant in Nagpur; With both ON/Off grid; Help with most efficient selection of PV panels, inveters, and other components. Plz provide the info with subsidy by govt. as well

45

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46

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47
MAYANK SRIVASTAVA

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49
Sanchit Raj Garg

Pls provide ur email ID and mobile

Sanchit Raj Garg
Alliance Automotives (P) Ltd
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9336186132
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TIN-09850102873

52

Hi, I would like to know couple of things regarding installing rooftop solar panels:
1) What is my return of investment from this project?
2)The lifetime of a solar panel is 25 years. However if the building goes on maintenance then is it possible to move these solar panels once they are installed?
3) In a grid connected solar panel system the power is not generated is the grid supply is not there. Then how beneficial are these solar panel systems?
4) Has anyone suffered any damage/ experienced anything that this may be seem a bad investment?

Thanks

53

Dear Nikita,

Thank you for showing your interest in the green energy. Here are the answers to your questions

1. ROI depends on your electricity unit rate plus the capacity of power plant you have installed. Generally it is 4-8 years.

2. Yes it is possible to move the system, but it depends on the installer (How the installer has installed the system).

3. Yes, Grid tied system doesn't generate power when the grid is not there, because the PCU syncs with the grid, However there are options available for the continuous running of the plant.

4. Panels don't break easily, but you can get them insured by any third party insurance. And an investment in green energy (which saves the environment) can't be a bad investment.

Thank You!

For any query please feel free to email me on [email protected] or can call me on 7307420111

54

Hi Nikita,
First of all i would appreciate your effort to go green, and secondly you have to trust the technology. And now i am answering your queries-
1. Your return on investment vary from your cost of electricity and the plant size. Generally a power plant is free in 4-8 years.
2. Yes we can move the solar panels to other building, it depends on how they are installed.
3. Yes it does't produce power when the electricity is not there, however, there is a solution to this. It syncs with the grid so it needs electricity, and it is beneficial of course. it is recommended where powercuts are minimum or there are no power cuts as batteries may add to the initial cost and maintenance cost.
4. You can get it insured from the third party for any damages and an investment in Green Energy (that saves the Environment) can never be a bad investmen.

For any more query you can e-mail us at [email protected] or can call me at Gaurav Kumar Raheja - +91-7307420111

55
Dibyendu Chowdhury

I am from New Delhi. I have a small business of solar panel installation at homes. Please suggest me some local solar panel installers in this area who can suggest on the specification of the items and do the installation work on project basis. All the items like solar panels, inverter, charge controller, battery and other items required, will be provided by me.

56

Location Gurgaon Sec 50. I wish to install solar panels (200watts X 4) at my backyard (Roof rights are not with us).The Inverter (180amps X 2 Batteries) is located at appx 10-15m from the Solar Panel expected location.Our backyard is almost exactly South facing and gets good amount of sunlight. Kindly furnish the um details.

(1) Type and cost of solar panels per watt ( PolyCrystalline or Mono).Which brand.Can you produce the data sheet.Are they MNRE approved.Is Jakson Bluebird a good brand

(2) Types of Charge Converters available and the cost.

(3) Cost of wiring - as mentioned Inverter is appx 10-15m away.

(4) Cost of installing - with iron angles on the back wall.- Two rcc sunshades above two windows already exist for placing the panels

(5) Any other cost incl cartage.

(6) Guarantees subsidy etc

Pl give me an appx cost estimate so that I can then request you for a survey visit to site.

57

Hello Mr. Narinder,
2*180 Ah batteries would store approx. 4.3 units and as1 kw solar panels generate 4-5 units in a day, considering this 800w of panels would only generate 3.5 approx. units and if you are running some load as well during the day time then you should increase the number of panels so that it suffice your load requirement and keep you batteries fully charged.
For installation and other solar components (all MNRE approved) at nominal prices please call- 8527070778

58

I think its important to point out that off-grid is suitable when users face power cut problems, while on-grid is suitable where the grid is very reliable and power cuts are rare. on grid is basically a green investment. On- grid systems will not function when the grid is down (power cut).

59

but we also have option of grid tied system with battery backup. yes they are expensive but will support your load during power cuts. If you are planning for solar pv system and have question call-8527070778

60
Vairamuthu Gunasekaran

Hi , I am located in Madurai tamilnadu. We are constructing a new apartment and i wish to install a solar plant with a capacity of 1 KW. I have enquired local merchant for the cost of install , inverter and batteries cum controlling units . In total, It costing me 1.4 lacs. After reading few discussion i feel this quoted cost is huge and need your advise

61
DTECH POWER SOLUTION

Dear Sir,
Please email your detail requirement on [email protected]:disqus .com or can call 9161368555 so we can help you further. we have experience for the same as you asked for.

62

Sir,
Kindly advice for the no. of Batteries in the battery bank if i intend to use approx. 15 units per day using an offgrid Solar system

63

I'm not sure Shahid, if you have already installed 10 batteries, but if you have not then you should do the calculation again as in a off grid system battery size should be calculated basis your energy use during the time when sun is not available cos out of 15 unit there would be unit which you may use during day time which your batteries don't have to support

64
Abhishek Jain (Mod)

Hi Shahid,

A 150 Ah battery can store up to 1.5 units of electricity. So you would need 10 such batteries to store 15 units.

65
DTECH POWER SOLUTION

Dear Sir,
You can contact us with detail of your requirement on [email protected] .com or can call 9161368555. we have installed so many installation. so you can get benefits of experencd team.

66
DTECH POWER SOLUTION

Dear Madhu Ji,
You can contact us with detail of your requirement on [email protected] or can call 9161368555. we have installed so many installation. so you can get benefits of experencd team.

67
Kalpesh Prajapati

We are school and we would like to implement solar system for our school, hence please guide us for the same.

68
DTECH POWER SOLUTION

Dear Mr. Prajapati,
Please tell me your requirement on 9161368555 or email on [email protected]
we have done same as earlier with experience.

69

Yes.8529100109 wtsup no.

70
krishna shrivastava

please send me your contact no. on whats up or email

krishna shrivastava
07415324645
[email protected]

71
DTECH POWER SOLUTION

Please email your detail requirement on [email protected] or can call 9161368555 so we can help you further. we have experience for the same as you asked for.

72

Dear sir

It is indeed a good decision to make your school an environment friendly one and it will also make the students proud of there school.
you can contact us on +91-9837792324 if you want to know about installing a rooftop solar power plant.
we have an experience of installing highest number of rooftop solar power plants in india including many installations in different educational institutes.

Thanks
Aman

73

Hi Kalpesh
We provide all types of solar power system at best prices.So you can contact us on "[email protected]" or +91-8591061100.
You can also visit our website http://www.joshisolar.in

Thanks

74

Contact : Solar grid solutions for
Home/ Institutes/ hospitals/ malls/ industrial areas 5 KW to 10 MW. We provide services across India at very nominal rate which are competitive in market.

For any query, Call : 9312700996
visit us at : http://www.solarbird.in

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