Electricity Saving Tips For Homes And Offices

Roof-Top Solar PV system project for home and office

By on September 5, 2017

Electricity generated through coal plants is becoming expensive by every passing day. Power cuts and increasing dependence on DG sets is causing a lot of damage to the environment. The demand supply gap for electricity is increasing in the country which makes it very important for people to start thinking of other ways of realizing their energy needs. Keeping this in mind Ministry of New and Renewable Energy (MNRE), Government of India is promoting off-grid solar PV systems under the Jawaharlal Nehru National Solar Mission in the country. Many people in the country have started feeling the need of installing solar PV system for their home, apartment complex or small office use, and with this article we would try to provide some information which can be a good starting point for a roof-top Solar PV system project.

What is a Solar PV cell and module?

Solar PV cell is the basic building block of a PV system. It consists of semiconductor material that absorbs sunlight to generate electricity through a phenomenon called “photoelectric effect”.  Only sunlight of a certain wavelength can effectively generate electricity. Although a solar PV can generate electricity on a cloudy day, but it is not as effective as it is on a sunny day.

A basic PV cell produces a very small amount of electricity and multiple of them are connected together to form a Solar PV module that can generate 10W to 300W output. If more electricity is required, them multiple such PV modules have to be installed in an array.

Multiple kinds of materials are used to create a solar cell and the efficiency of solar cell depends on the same. The efficiency of a solar cell is defined as its capability to convert a certain amount of sunlight into electricity. Solar cells available in the market are of various efficiencies: 4%, 8%, 12%, 14% and 16%. The size of a Solar PV module required will depend on output and efficiencies:

Roof Area Needed in Sq. Ft.

PV Module Efficiency (%)

PV Capacity Rating (Watts)

100

250

500

1,000

2,000

4,000

10,000

4

30

75

150

300

600

1,200

3,000

8

15

38

75

150

300

600

1,500

12

10

25

50

100

200

400

1,000

16

8

20

40

80

160

320

800

For example, to generate 2000 watts from a 12% efficient system, you need a 200 sq ft of roof area. (Source: solar PV sizing information on energysavers.gov)

Solar home lighting systems approved under NSM (National Solar Mission) are required to have a certain level of efficiency. The CFL based solar systems are required to have module efficiency of 14% and above and a LED based solar system is required to have module efficiency of 12% and above. Please note that such systems will have a serial number starting with NSM engraved on the frame.

Sizing a solar system

Before you buy a system, it is very important to size your solar system properly. Sizing will depend on the load requirements in your setup. It is important to note that a Solar system is good for operating low wattage appliances like lights, fans, TV, etc. High wattage appliances like Air Conditioners and Water Heaters cannot be operated using solar PV system (in fact solar water heaters and solar air conditioners are available separately). It is very important to make sure that your system is energy efficient so that you do need a bigger sized solar system. Please read our previous article: Before Renewables think Energy Efficiency. The connected load of your setup will help you determine the size of system that you need and that in turn will drive the cost of the system.

Other considerations for installing a solar system

Although a solar PV system can generate electricity through direct or scattered sunlight but it is very important to assess the amount of sunlight available at the location where a solar PV system is being installed. To collect maximum sunlight the ideal orientation of a Solar Panel is towards south.  However a 45-degree east or west of south can also work. The system should be placed in such a place so that there is no obstruction of trees or adjoining building. In case these requirements are not getting fulfilled, an expert should be hired to do a detailed analysis on the amount of sunlight available. <we are in the process of creating an online directory of such experts, please sign to our newsletters to get the updates>

The load carrying capacity of the roof where the solar panels are to be installed should also be done. Solar Panel structure typically weight 15kg per sq meter and the roof should be able to handle the load.

Tilt at which the solar panel is installed is also an important consideration. It is important that the tilt of the solar panel is the same as the latitude of your location.

System output or electricity units generated from a solar system

Although we talked about wattage capacity of a solar PV system, but that does not mean that the wattage will be available 24 hours a day and all throughout the year. The units or kWH output of a solar panel will depend on the panel efficiency and availability of sunlight in a location. The factor that defines this output is called CUF (or Capacity Utility Factor). For India, it is typically taken as 19% and the calculation of units goes as:

Units Generated Annually (in Kwh) = System Size in Kw * CUF * 365 * 24

So typically a 1kW capacity solar system will generate 1600-1700 kWH of electricity per year (please note that this is just a thumb rule as the CUF will vary in different cities in India).

Components of a Roof Top PV system

A typical Roof Top PV system also contains a set of batteries and inverter along with the modules of Solar PV cells. The overall efficiency of the system will also depend on the type of battery and inverter used in the system.  It is important to choose the right components for most effective use of Solar PV systems.

“Deep Cycle” batteries (generally lead-acid) are the best suited for a solar PV system. They last for 5 to 10 years and are 80% efficient (can reclaim 80% of energy stored in it). These batteries are also designed to provide electricity for long periods and can discharge up to 80% of their capacity repeatedly. Automotive batteries that are shallow cycle should not be used. Sealed maintenance free or tubular positive plate batteries are good for Solar PV systems. It is important to size the batteries properly so that they can store sufficient power based on your needs during cloudy weather. Batteries should be located in a space that is easy to reach (for maintenance), well-ventilated and protected from extreme weather.

Even inverters are not 100% efficient and it is important to choose the right inverter that is at least 85% efficient (If a system is purchased under National Solar Mission then these standards are guaranteed). A modified sine wave or a pure sine wave inverter is better suited for a solar PV system. Modified sine wave inverters are cheap but less efficient. They waste some electricity in form of heat. They create a buzz sound with appliances and thus should be used only with low-end appliances. Pure sine wave inverters are most efficient but are expensive. They are good for all kinds of appliances.

Warranties and Maintenance requirements for a Solar PV system

If purchased under NSM a Solar PV module comes with a warranty of 25 years from the date of supply. A solar home lighting system (with inverter) comes with a warranty of 5 years and the batteries if sealed maintenance free come with 2 years warranty and lead acid flooded type battery comes with 5 year warranty.

It is important that the manufacturers provide an operation, instruction and maintenance manual in English and local language along with the system. As with all electrical and mechanical system, solar PV system also needs regular maintenance. An efficient long lasting system is one that is maintained properly and regularly.  A solar PV system does not require a lot of maintenance but it is good to clean the system of dust and bird droppings regularly to maintain its efficiency. If you choose a maintenance free battery then you need not worry about the battery, else the battery will need regular maintenance. Make sure that the system is getting adequate sunlight and is not getting shaded by nearby trees, etc.

Costs of Solar PV systems and incentives from MNRE

As per our resources from the solar PV industry, cost of a PV module (just the panel) costs anywhere between Rs 30 to Rs 50 per watt of power generated. A good imported module will cost around Rs 40 per watt. Good ones manufactured in India would come as low as Rs 30-32 per watt. Please note that this is the cost for the panel and in case you are looking for inverter and batteries, the cost would be additional. A good 5 kW system for a home would cost around Rs 3-4 lakhs to setup, which can provide electricity for 25 years. The additional operating cost will include the cost of replacing the batteries.

Where can you buy solar PV system from

The list of authorizes suppliers/manufacturers is available at MNRE link: http://mnre.gov.in/file-manager/UserFiles/list_manufacturers_SPV_NABARD-part-I.pdf

Quick video that can guide you on Rooftop Solar PV buying in India:

 

 

More Informational Links On Our Website

More details on Solar PV Prices in India: Solar Panel Price in India

Understand more about basics of Solar PV systems on our link: Solar electric, solar thermal, power generation, inverters, grid, off-grid: clearing the cobweb

Get help in understanding financing options available to finance your Solar PV System: Financing Options for Solar Rooftop Projects in India

References:

http://mnre.gov.in/file-manager/UserFiles/cfl_spls_2012_13.pdf

http://mnre.gov.in/file-manager/UserFiles/led_spls_2012_13.pdf

http://energy.gov/energysaver/articles/small-solar-electric-systems

http://energy.gov/energysaver/articles/planning-home-solar-electric-system

http://energy.gov/energysaver/articles/installing-and-maintaining-home-solar-electric-system

http://energy.gov/energysaver/articles/balance-system-equipment-required-renewable-energy-systems

http://www.mnre.gov.in/file-manager/UserFiles/pdf/feedback-and-response.pdf

http://www.teda.in/


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अगर आप के कुछ भी सवाल हैं, वह आप नीचे दिए हुए सवाल-जवाब सेक्शन में पूछ सकते हैं। आप अपने सवाल हिंदी में भी पूछ सकते हैं और हम आपको हिंदी में ही जवाब देंगे। कृपया एक ही सवाल को बार बार ना डालें। आप एक बार जब "submit " बटन दबाएंगे, उसके बाद आपका सवाल यहाँ दिखने में थोड़ा टाइम लगेगा। कृपया धैर्य रखें। अगर हमारे पास आपके सवाल का जवाब है तो हम उसे जल्दी से जल्दी जवाब देने की कोशिश करेंगे। कृपया अपने सवाल ई मेल या सोशल मीडिया पर ना डालें।

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361 comments

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1

hi
mai apne ghar k liye solar setup krwana chahta hun but mujhe koi idea nhi h ki iske liye kitne exps hoga

2
Abhishek Jain (Mod)

Do tarah ke solar pv system aate hain: grid connected aur off-grid. Agar aapke yahan bijli kaafi jaati hai to aapko off-grid system hi lagana chahiye. Par agar aapke yahan bijli zyada nahin jaati hai aur aapko apna bijli ka bill kam karne ke liye solar lagana hai to aapko grid connected system lagwana chahiye.

1 kW off-grid system 80-90 hazaar tak ka padta hai. Agar aapko zyada ki zaroorat hai to usi hisaab se zyada hoga (to 5 kWp lagbhag 4 lakh ka padega).
1 kW grid connected system 55-60 hazaar ka padta hai.

Agar aap grid connected lagwana chahte hain to aap maximum apne ghar ke connected load (kW) tak hi laga sakte hain. Aapka connected load aapke bijli bill par hoga.

Agar aapko offgrid lagwana hai to aap hamari website ke is page par diye hue calculator se apne load ka hisaab laga sakte hain: https://www.bijlibachao.com/solar/solar-panel-cell-cost-price-list-in-india.html

Off-grid system mein battery hoti hai to wah bijli generate kar ke battery mein store kar ke rakhta hai jo ki zaroorat padne par istemaal ho sakti hai ... Grid connected system mein battery nahin hoti hai aur aapki bijli jo generate hoti hai wah bijli company ko bik jaati hai (tabhi aapka bijli ka bill kam hota hai).

3

Hello,

I am looking for a solar PV system for anganwadi in rural Maharashtra.
I just need electricity for two lights and one fan and one electric water filter. what will be instructions from your end before buying it from Local solar pv system providers. I am in Gadchiroli 4 hours from Nagpur city.

I need quotation request format for the same.

Regards,
Prafull

4

Hello her I m very much interested in solar system of 150kva for commercial uses
Kindly gaid me regarding this
Kunal varshney
+917895222069
+918445760570

5
Tekchand Dalsukhani

Are there any government rebates or incentives available to reduce the cost of a solar installation? Could you also cover pros and cones of energy storage systems like Tesla's Powerwall in another article.

6
Abhishek Jain (Mod)

Tesla Powerwall has not yet come to India. We will surely cover it once it does. There are subsidies, but they are extremely hard to get. You can read more over here: https://www.bijlibachao.com/solar/grid-connected-solar-pv-rooftop-system-india-home-panel-subsidy-cost.html

7

How many 300w panels required for 5 kw

8
Abhishek Jain (Mod)

1 kW = 1000 W .... you can do the math accordingly.

9

40kwp grid connected solar lagwane se kitna bijli ka bil kam ayega

10
prem prakash bathav lodhi

me anshuman solar system llp ke nam se registered channel partner mnre se hu, me m,p urja vikas nigam bhopal me solar roof top net metering lagane ke liye registration karwana chahta hu ,kese hoga krpiya bataye.dhanya wad

11

we are providing solar panel for all kind of properties...any query or intrested for instalation can contact us..
email id:[email protected]
cont no:-7834890233

12

सोलर फिटिग ईन्जीनीयर फ़रूख़ाबाद उत्तर प्रदेश

13

How the government purchases the units, per unit price?

Author16

Every state has a different policy. You can get some details on this page: https://www.bijlibachao.com/solar/grid-connected-solar-pv-rooftop-system-india-home-panel-subsidy-cost.html

17

Aryan Kumar
Please provide your email id and location we can provide you detail
proposal or send your email at [email protected]
Rooftop Solar PV System -
Off Grid (with Battery)
On Grid(With Net Metering)
Solar Photovoltaic Modules Panel
Solar Led Street Light
Solar Water Pump
Office No.8765647991
Regards-
Aryan Kumar
8765647991
Kanpur

18

How can i use solar panel roof top without battery.only sun light can I use Dc convert Ac kw.

19

सोलर फिटिग का काम करते है

20

HOW MUCH COST FOR 2 AC OF 105 TON OPERATE IN SOLAR POWER PLANT INSTALLATION CHARGE.

21

please email us ur all queries..

thnks

22

Please tell me Amount for 5 kilowatt tubwell

23

email us for all ur queries

24

Roof top home solor

25

Hanumangarh rajasthan

26

I want to operate 2 ac of 2 tons each. What will be size of the panels. And approx price of entire solar system

27

email us...or contact us
cont no:-7834890233

28

Hi,

We would like to introduce our company “DAIZ Solar Inc” based at Gurgaon, Haryana. We have more than 25 years of experience in the solar industry which gives us enough expertise to understand your needs and deliver you the best as per your requirements. Our teams of expertise and highly skilled professionals have successfully installed Megawatt power projects and roof-top power plants.
We have been an established and growing EPC Player in Solar with an excellent track record for the best client satisfaction. We have never compromised on the quality and the services provided to our clients as we mainly focused on client satisfaction towards our products at a competent price. We believe in preserving our nature by generating eco-friendly and uninterrupted power supply.

You may contact us:
Land Line: +91-124-4201724/23,
Email: [email protected]

29

I want to see one demo soler home in indore

30

Lucentway Pvt ltd is a System Integrated Renewable energy company. We provide a complete solar solution to individual homes, apartment buildings, hotels.
Please feel free to call us
[email protected]
+91 8779776765
+91 7021311875

31
deepak purohit,,

sir.,how can i run 1/2 HP water pump by solar panel...is inverter required. or direct dc pump is preferred..what price of submersible pump..panel etc price...???

32

Dear Deepak Purohit,
DC solar pump is generally prefered upto 5hp...You can even use ac solar pump but will require an inverter along with solar panel. Ac solar has advantage that one can switch to normal supply in case non availability of supply from solar panel.The cost of solar pump ranges from 65K to 1.5L as per requirement

33

Is the pricing data also more than a year old? I see that this nice article was written on 29 Jun 2016, how frequently you update price data in rapidly changing market?

34

I want to set up solaris Pv module on my roof.So help me for all.I am in south 24 pgs in W.B.

35

I would like to install a solar PV system for a home in Sikkim. I have been trying to find an expert who could do an analysis and guide in procuring the system and setting it up.

36

I am looking for a Service Provider in Jaipur , Rajasthan , for Installation of Grid Connection Roof Top Solar PV System at my Residence and which can handle end to end work of system installation including subsidy , financing (if available) etc.

37
Deepanshu bansal

I want to apply for home solar system so please telle the cost of apply and how much time it will take to complete the setup.

38

please contact with details i am a retired electrical engineer from railways and working as a consultaint for solor renovable energy

39

GNN Digital Technologies & Solar systems ( Rajasthan )
सोलर लगाओ, बिजली बचाओ..
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बिजली के बिल से छुटकारा पाये.. हमारा लक्ष्य 2022 तक हर घर में रोशनी हो...... India Top company... (TATA solar,)
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Contact number-8441001044

40

Solar power is the best way to replace conventional electricity. Solar Power Companies in India producing solar panels in large amount. Solar power is environmentally friendly. It will reduce your electricity charge. You can save solar power and use it for later.
asterixenergy.in

41

very good information.

42

We are into Solar System Solutions in Gujarat, Haryana and Delhi. We work for off-grid, on-grid and Street light power projects. Please either call us on 9999275538 / 9727729735 or mail us on [email protected]

43
indresh kumar thapliyal

i would likee to subscribed

44

I am very interest to install in my house

45

Dear Alik,
Thank you so much for your interest towards the Solar ( renewable Energy )
we are The Solar EPC contractor.so if you have any query regarding solar feel free to call.

Regards,
Manish Raya
Lata-tulsi Electrical & Switchgear Enterprises
khopoli, Maharashtra
8055783787 /9145109858

46

Dear Mr. Alik Manna,

Greetings.

We found your interest in Solar on Bijlibachao website.

We are the leading Channel Partner/Distributor/Whole Sale Supplier of SuKam Solar/UTL Solar/Exide Dynex/Okaya products in Delhi NCR and other locations.

Please let us know your requirements about solar. We will be happy to help you.

Looking forward to hear you soon.

--
Regards

Shane Alam
Business Development
& Project Implementaiton
Ph: 7503336293, 9313660338

47

Kindly share ur details & requirement for proposal on our email is: [email protected]

48

We are into Solar System Solutions in punjab,U.P, Haryana and Delhi. We work for off-grid, on-grid and MW power projects. Please either call us on 9999055214 or mail us on [email protected]

49

I want to setup solar system in home roof

50

Dear sir,
Thank you so much for your interest towards the Solar ( renewable Energy )
we are The Solar EPC contractor.so if you have any query regarding solar feel free to call.
Regards,
Manish Raya
Lata-tulsi Electrical & Switchgear Enterprises
khopoli, Maharashtra
8055783787 /9145109858

51

Kindly share ur details with us on our emailid: [email protected]

52

We are into Solar System Solutions in punjab,U.P, Haryana and Delhi. We work for off-grid, on-grid and MW power projects. Please either call us on 9999055214 or mail us on [email protected]

53

We are into Solar System Integrator based out of Bangalore and deal in both the solar in off grid and On grid power project as well as solar Street light, solar water pumping system, Please either call us on 9738189157 or please mail us on [email protected]

54

lease provide your email id and location we can provide you detail
proposal or send your email at [email protected]
Rooftop Solar PV System -
On Grid(With Net Metering)
Off Grid (with Battery)
Solar Photovoltaic Modules Panel
Solar Water Heater ETC & FPC
Ofiice No.9044064100
Regards-
Arpit Jaiswal
9455004100
Kotak Solar pvt ltd(distributor)
Lucknow

55

i have query plz contact with me on this no. 8826335057

56
kedar Nath singh

i want to setup solar power system at home. i want government subsidy also. i am farmer. can you provide me any mail details that guide me to provide subsidy. so that i can setup solar system
thanking you
From
Kedar nath Singh
village-khadhi(east tolla)
post + ps- bhore
dist-gopalganj
state -bihar
pinciode-841426

57

Thank you so much for your interest towards the Solar ( renewable Energy )
we are The Solar EPC contractor.so if you have any query regarding solar feel free to call.
Regards,
Manish Raya
Lata-tulsi Electrical & Switchgear Enterprises
khopoli, Maharashtra
8055783787 /9145109858

58

hello frnds we are a india based solar rooftop pv installation company. we deals in solar rooftop, solar mega projects consultancy, solar pumps in Maharashtra region.
for more information contact 9518762699

59

What is the cost of... 2bhk house.... Please inform me.. On my email
[email protected]

60

We are interested to have roof top solar panel with full installation in Ghaziabad. Can we get some suppliers contact numbers in Ghaziabad so that we may get full information on our requirements &total cost.
Kapil Palta
09811403974

61

I am interested to fitting solar panels on roof top of my house. To guide me for subsidy from government & contact service provider. Thanks for sahakar.

62

We are into Solar System Solutions in punjab,U.P, Haryana and Delhi. We work for off-grid, on-grid and MW power projects. Please either call us on 9999055214 or mail us on [email protected]

63

contact us for more information on solar rooftop
phone:9738189157

64

I am interested to buy a sollar PV for rooftop of house.
If possible, provide me the contacts of service provider

65

contact us for more information on solar rooftop
phone:9738189157

66

Good effort to understand, however can i use solar electricity for my farm machinery like Bore water Pump, Kutti Cutter, etc.

67

Pls let us know to run 2 window ACs of 1.5 ton each what capacity rooftop solar system is recommended.

68

contact us for more information on solar rooftop
phone:9738189157

69
Abhishek Jain (Mod)

Solar PV offgrid solution would be very expensive to run ACs. A typical 1.5 ton AC would consume about 1-1.2 units in an hour (and more for window AC) and a 1 ton AC would consume 0.8-1 unit per hour. For 8 hours that would be about 8-10 units of electricity. A 1 kWp system that would cost about 1 lakh would generate only 3-4 unit per day. So you will have to go for 2-3 kWp system which would cost 2-3 lakh just for 1 AC. So it will be really really expensive to run AC on solar.

70

I would like to start this business.can you guide me and if necessary required training.presrntly I am in Ambernath dist Thane.

71

I want setup 2kw solar gride tie roof top system in uttar pradesh help me
Reply
Share

72

contact us for more information on solar grid tie system
phone:9738189157

73

please share contact detail of an experties about solar panel in kolkata.

74
Devkiran singh

In Rajasthan grid tie roof top solar system with net metering setup with all formalities with govt

75
Devkiran singh

I want setup 5kw solar gride tie roof top system in Rajasthan with net metering help me

76

Dear sir,
Thank you so much for your interest towards the Solar ( renewable Energy )
we are The Solar EPC contractor.so if you have any query regarding solar feel free to call.
Regards,
Manish Raya
Lata-tulsi Electrical & Switchgear Enterprises
khopoli, Maharashtra
8055783787 /9145109858
[email protected]

77

contact us for more information about 5kw grid tie roof top system, we are solar service provider
phone:9738189157

78

I wants to know about basics about solar panel working model of 250 watts and installation of the system

79

I wish to know the details (cost, expected electricity savings, subsidy etc.) of solar power installation details for 100 square feet roof top area in Faridabad (Haryana) for domestic use.

80

contact us for more information about grid tie roof top system, we are solar service provider
phone:9738189157

81
Abhishek Jain (Mod)

Hello Mr Rajpal,

I would suggest that you read the writeup that we have on solar grid connected system : https://www.bijlibachao.com/solar/grid-connected-solar-pv-rooftop-system-india-home-panel-subsidy-cost.html

This article has comprehensive information about grid connected system where you can sell back to the grid after self use.

I would also suggest that you check out this video on our youtube channel:

82

Planing to install roof top on our house.Pl let me know the fallowing
How much it cost to supply &install 3/5 Kw. How much space is required.. How much UNITS produced per month.
Can any subsidy available from State or central Govt.Can we sell back units after self use to the grid.?

83

contact us for more information about grid tie roof top system, we are solar service provider
phone:9738189157

84
Abhishek Jain (Mod)

Hello Mr Vasan,

I would suggest that you read the writeup that we have on solar grid connected system : https://www.bijlibachao.com/solar/grid-connected-solar-pv-rooftop-system-india-home-panel-subsidy-cost.html

This article has comprehensive information about grid connected system where you can sell back to the grid after self use.

I would also suggest that you check out this video on our youtube channel:

5 Kw grid connected system would generate about 20 units per day and would cost about 3-4 lakhs.

85

I'm interested for my home in bangalore, please reply back ASAP with quote for 390sq.ft area

86

Dear Mr Charan, If you have not yet finalized your system with any system integrator , please give a call on 9740210502 and I would be happy to help you with putting up a system after a detailed site study and discussion with you.Regards

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