How much Solar Power system costs for home?

Since last couple of days, I was researching for solar power system for my home. How it can benefit me? Can I live without govt provided power connection? I have monthly consumption of 650 Kwh max and that is in the time of summers. In this article, I am covering the most important aspect i.e. cost (of the system in INDIA).

Lets calculate cost for all important ingredients of Solar power system-
(Note - I have gathered all this information after talking to different solar power system sellers in India.)

1. Solar panels cost -
650 kwhr / 30 days = 22 units per day. If you want to generate one unit, you need 200 watt solar panel

To generate 22 units you need 22 x 200 = 4400 watts panels

taking in to inefficiencies of the total system we need 5000 watt of panels

Cost of the panel is Rs 60 per watt

5000 x 60 = Rs. 3,00,000.

2. Battery -
To store this in to the battery (assuming that all the eneregy generated by the solar panel will be required to store in the batteries for using it in night time) you will need batteries that can store 25 Kwh of electrical energy.

Th cost of the Tubular Battery battery will be Rs. 10,000 per kwh

Total cost of the lead acid batteries will be -

Rs. 10,000 per kwh  x 25 kwhr = Rs. 2,50,000.

Now it is not possible to charge these batteries within 5 to 6 hrs when sun is shining. You need 4 times the normal capacity.

So the total cost of the batteries will be -

Rs. 2,50,000 x 4 = Rs. 10,00,000.

3. Charge controller, Inverter & Installation-
Apart from battery and solar panel you will need charge controller and inverter and other hardware and installation and commissioning that will cost you another Rs. 2,00,000.

So the total cost will be Rs. 15,00,000 (see above 1+2+3) for totally full proof system. You will see that main cost is of batteries. It depends on whether you need 24 hrs backup, 8 hrs backup or as per your needs.

So we can reduce the cost by reducing the batteries.