Rooftop Solar Savings Calculator (2026)

See how much a rooftop solar system would cost and save you, including the PM Surya Ghar central subsidy. Enter your monthly units and roof area to get a system size, net cost after subsidy, monthly savings and payback period.

Up to ₹78,000 central subsidy 25-year panel life Free · no sign-up

Average monthly consumption (units)

or, if you only know your bill

Monthly bill amount (₹) We'll convert it to units using your tariff below.

Shadow-free roof area (sq ft)

~100 sq ft of clear roof is needed per 1 kW.

Tariff (₹/unit)

State subsidy (₹) i

Advanced

System cost (₹ per kW) Turnkey installed cost before subsidy. Typically ₹50,000–65,000/kW.

Year-by-Year Savings Projection

Year	Annual savings	Cumulative savings	Net position	Status

Assumes electricity tariffs rise ~5% a year and panel output degrades ~0.7% a year, so the flat headline figures above are on the conservative side. Net position = cumulative savings minus your net system cost after subsidy.

More solar tools on TheDiscomBill

Solar Panel Size Calculator (2026) — how many kW and panels your ACs and load need, plus roof area. · Solar Battery Backup Calculator (2026) — size a LiFePO4 or lead-acid bank to ride through power cuts.

Estimates use India-average generation (~4 units per kW per day) and the PM Surya Ghar residential central subsidy (₹30,000/kW up to 2 kW, ₹18,000 for the 3rd kW, capped at ₹78,000). Actual generation, cost and state subsidy vary with location, roof orientation, shading and your DISCOM's net-metering policy. Treat this as a planning guide and get a quote from an empanelled vendor on the National Portal ↗.