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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393 comments

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1

We are one of the leading Solar EPC Company in India. We have international experienced Solar engineers and solar experts with more than 20 years of experience in Solar. contact us, our expert are available to serve you.

Thanks and Regards
The Solar Man

2
Kirloskar Solar Solutions

If you wish to invest in solar, make sure your putting your money on a brand that is reliable enough to provide you a least guarantee of 10 years of self existence. People claiming their warranty to be 25 years may have started business since last a month may be. Trust your own brand , invest in Kirloskar solar solutions call up at 08530087989

3

Sir/madam,
Plz contact. This mail ID . I am very very much interested in solar system. I am not educated person so contact these languages, kannada, Hindi,or telagu thank you

4

I am interested in having a solar roof top PV for my residence of 1150 sqft. looking for 1kw power generation with the govt, subsidiy scheme

5
Kirloskar Solar Solutions

Hello kamlesh call up on 8530087989 for complete one stop solution

6

Call or What's up or Email for any types of Solar Project related information. Mo. 7433961078, [email protected]

7

I want 100w solar panel and100 ah battery under government scheme for rural people's what is the total cost

8

Please Email me on this ID: [email protected]
We would love to help you with rural solar projects

9
Yagya Valkya Sharma

I have around 9000 sq yards farm land in Rajasthan fully exposed with Sunlight. Could you please provide me with cost benefit report also check the regulatory requirements. 90% of total electricity output would be given to Grid. Please provide me with viability report as soon as possible.

10
Kirloskar Solar Solutions

Mr. Yagya, assuming the area mentioned by your input you almost can light up16 average 4 person each homes or run a whole mall or trade electricity for earning almost1.7Lakhs or save the same every month immediately after you setup your solar plant.. want to know how ? call up 8530087989

11

We are one of the leading Solar EPC Company in India. We have international experienced Solar engineers and solar experts with more than 20 years of experience in Solar. contact us, our expert are available to serve you.

Thanks and Regards
The Solar Man

12

may i please have your contact number? We are a team of Solar power plant experts.
you can e mail me at [email protected]

13

Hi Yagya,
Can we text me your number... I will describe you each and every thing on phone

14

Hi ,
Can you text me... I will describe each & every detail...
My num is 9075026039

15
Machhindra C Narwade

sir ji muze solar energy system ka mnre and meda is ke crosses karna hai surymitra is tareghe plz gid.

16

What is the to install solar pv system to power 100 electric cars in car park?

17

Hi Mr. Saravanan.
can you email me your contact and we can discuss this project further. We are a team of Solar innovation experts. [email protected]

18
basant kumar jain

what is the cost of fixing solar power unit for 1200 sq foot independent house and where we can buy this unit what subsidy we can get i am a resident of bangalore

19

Hi Basant ji,
We are from bangalore and install for residential, commercial and industrial applications. To give you an accurate answer, I would need to get few more details from you, for e.g., electricity bill, and also do a site survey. Kindly call me on 9940645659 and we can take the discussion forward.

20
vijay kumar sharma

dear Sir,
main apne ghar ki chatt par govt. ke solar plant lagana chahta hu. to please uska kya process h or uski kya guideline h uske bare me bhi bataye.

21

text or call on 7506074001, our expert will guide you.

22

Hi ,
Can you text me... I will describe each & every detail...
My num is 9075026039

23

u can reach us with ur enquiry on [email protected] for complete solar solutions or reach on 8080188888 Navin Shetty

24

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

25

text or call on 7506074001, our expert will guide you.

26

Hi Gajendra,
Its depend on your uses. App kitna electricity use karto ho uske upar depend hai.
please contact me 9075026039

27

On Grid - approx 65000/- per KW
Off Grid - approx 85000-1lac per KW

Actual cost will be based on quality and backup hours. Subsidy will be applicable as available.

28
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).

29

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

30

text or call on 7506074001, our expert will guide you.

31

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

32

text or call on 7506074001, our expert will guide you.

33

approx 75 lacs with cost with around 2.25 lac unit per year generation

34
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.

35
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

36

How many 300w panels required for 5 kw

37

16 panels will be 4800w

38
Abhishek Jain (Mod)

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

39

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

40

40Kwp will produce 200 units per day, if commercial rate is applicable it will give around Rs 1600 saving per day. (commercial rate are different in different states)

41
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

42

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

43

सोलर फिटिग ईन्जीनीयर फ़रूख़ाबाद उत्तर प्रदेश

44

How the government purchases the units, per unit price?

Author47

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

48

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

49

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

50

सोलर फिटिग का काम करते है

51

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

52

please email us ur all queries..

thnks

53

Please tell me Amount for 5 kilowatt tubwell

54

email us for all ur queries

55

Roof top home solor

56

Hanumangarh rajasthan

57

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

58

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

59

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]

60

I want to see one demo soler home in indore

61

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

62
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...???

63

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

64

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?

65

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.

66

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.

67

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.

68

How shall I get govt.subsidity solar equipment s for my home install. Assam, lakhimpur dist.

69
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.

70

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

71

GNN Digital Technologies & Solar systems ( Rajasthan )
सोलर लगाओ, बिजली बचाओ..
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72

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

73

very good information.

74

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]

75
indresh kumar thapliyal

i would likee to subscribed

76

I am very interest to install in my house

77

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

78

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

79

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

80

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]

81

I want to setup solar system in home roof

82

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

83

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

84

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]

85

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]

86

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

87

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

88
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

89

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

90

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

91

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

92

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

93

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.

94

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]

95

contact us for more information on solar rooftop
phone:9738189157

96

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

97

contact us for more information on solar rooftop
phone:9738189157

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