Solar calculators › Rooftop solar estimate
Rooftop solar estimate
From your electricity bill: system size, cost, PM Surya Ghar subsidy, loan EMI, savings and payback.
Inputs
Inputs
Bill amount ÷ units on the bill.
Typical 2026 rooftop price with GST; ask installers for a quote.
Results
- Suggested system
- 3.30 kWp (6 × 550 W panels)
- Shade-free roof needed
- 23 m²
- Units generated, year 1
- 4,637 kWh
- System cost
- ₹ 1,81,500
- Central subsidy
- ₹ 78,000
- Your net cost
- ₹ 1,03,500
- Saving, first year
- ₹ 36,412 (≈ ₹ 3,034 / month)
- Payback
- 2.9 years
- Net saving over 25 years
- ₹ 10,90,185
- Assumes 5 peak sun hours, performance ratio 0.77, 0.5 %/year degradation and a 3 %/year tariff rise. Units up to your present use save your rate; units beyond it are valued at ₹3 (export).
- Subsidy as per PM Surya Ghar: Muft Bijli Yojana (MNRE, 2024); confirm on pmsuryaghar.gov.in before you rely on it.
www.barrel.energy/tools · Rooftop solar estimate · 23/10/2026 · Planning estimate; final design to be checked by the project engineer.
Want exact figures for your roof? BARREL engineers survey the site, design the plant and handle the subsidy paperwork.
Ask for a site survey