100 kW solar system price in India (2026)
A 100 kW rooftop system for a shop, school or factory costs about ₹40.19 lakh with GST. It makes about 14,600 units a month, saves about ₹1,31,400 a month, and with 40% accelerated depreciation pays back in about 2.8 years.
100 kW price, line by line
| Solar panels | ₹18,05,400 |
| Inverter | ₹5,00,000 |
| Mounting structure | ₹3,00,000 |
| Cables, DCDB, ACDB, earthing | ₹4,00,000 |
| Installation labour | ₹2,50,000 |
| Net meter, DISCOM fees, transport | ₹40,000 |
| Installer's margin | ₹3,95,448 |
| GST 5% on 70% of the value on ₹25,83,594 | ₹1,29,180 |
| GST 18% on 30% of the value on ₹11,07,254 | ₹1,99,305 |
| Price with GST | ₹40,19,333 |
2026 market averages from the same engine as the EPCoffice app. Your installer's brands and state change them — type your own rates in the calculator.
Tax and depreciation
A business can write off 40% of a solar plant's value in the first year (accelerated depreciation). At the 25.17% company tax rate that lowers the tax bill early, which is why the payback here is shorter than the price ÷ saving. Over 25 years the plant saves about ₹5.38 crore, a return of about 35.3% a year.
Change the tax rate in the calculatorOther sizes
For a house, see 3 kW, 5 kW or 10 kW. All sizes on one page: solar prices, 1–100 kW.
Questions about 100 kW solar
How much does a 100 kW solar plant cost for a business?
About ₹40.19 lakh with GST in 2026 (₹40,193 per kW) for panels, inverter, structure, wiring, installation and the net meter. There is no central subsidy for businesses.
How many units does 100 kW make?
About 14,600 units a month at 4.8 units per kW a day (Jaipur).
What is the payback of a 100 kW plant?
About 2.8 years at ₹9 a unit, counting 40% accelerated depreciation at 25.17% tax.
How much roof does 100 kW need?
About 700 m² of shade-free roof, for 170 panels.