20 kW solar system price in India (2026)
A 20 kW rooftop system for a shop, school or factory costs about ₹8.92 lakh with GST. It makes about 2,920 units a month, saves about ₹26,280 a month, and with 40% accelerated depreciation pays back in about 3 years.
20 kW price, line by line
| Solar panels | ₹3,61,080 |
| Inverter | ₹1,40,000 |
| Mounting structure | ₹60,000 |
| Cables, DCDB, ACDB, earthing | ₹80,000 |
| Installation labour | ₹50,000 |
| Net meter, DISCOM fees, transport | ₹40,000 |
| Installer's margin | ₹87,730 |
| GST 5% on 70% of the value on ₹5,73,167 | ₹28,658 |
| GST 18% on 30% of the value on ₹2,45,643 | ₹44,216 |
| Price with GST | ₹8,91,684 |
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 ₹1.08 crore, a return of about 32.2% 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 20 kW solar
How much does a 20 kW solar plant cost for a business?
About ₹8.92 lakh with GST in 2026 (₹44,584 per kW) for panels, inverter, structure, wiring, installation and the net meter. There is no central subsidy for businesses.
How many units does 20 kW make?
About 2,920 units a month at 4.8 units per kW a day (Jaipur).
What is the payback of a 20 kW plant?
About 3 years at ₹9 a unit, counting 40% accelerated depreciation at 25.17% tax.
How much roof does 20 kW need?
About 140 m² of shade-free roof, for 34 panels.