Tool
Built by the Solar Samachar editorial desk · Figures updated for 2026
Panels = system watts ÷ panel wattage (rounded up). Roof area ≈ 85 sq ft per kW of shadow-free space. Generation ≈ 4 units/day per kW. Indicative 2026 — actual layout depends on your roof.
Get a roof assessment — free quotes| System size | Approx roof area | Panels (545 W) |
|---|---|---|
| 1 kW | ~85 sq ft | 2 |
| 2 kW | ~170 sq ft | 4 |
| 3 kW | ~255 sq ft | 6 |
| 5 kW | ~425 sq ft | 10 |
An estimate is a great start — get 3 free, no-obligation quotes from vetted installers near you to see your actual price and subsidy.
Divide your system size (in watts) by the panel wattage. For example, a 3 kW system with 545 W panels needs about 6 panels. Most Indian homes install 2–5 kW, i.e. roughly 4–10 modern panels.
Around 80–100 sq ft of shadow-free roof per kW. So 1 kW needs ~85 sq ft, 3 kW needs ~250 sq ft and 5 kW needs ~425 sq ft.
Yes. A 545 W panel produces more than a 335 W one, so you need fewer of them for the same kW — handy when roof space is tight.
Roughly 4 units per day for every kW installed, so a 3 kW system makes about 12 units on a good day (~360 units a month).
Sources: PM Surya Ghar / MNRE (pmsuryaghar.gov.in) · Electricity (Rights of Consumers) Rules, 2020
These are planning estimates for 2026 — your actual system, tariff, sunlight and quotes will vary. Always confirm with an installer.