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Residential On-Grid Rooftop Solar Calculator

Your Energy Needs

units
₹ /kWh
Derived usage
300 units/month • ₹2,400/month • 3,600 kWh/year
100%

Panel Specifications

Wp
m
m

Solar Conditions

78%

Available Roof Space

m²

PM Surya Ghar & Other Subsidies

Special category includes Uttarakhand, Himachal Pradesh, J&K, Ladakh, North-East states including Sikkim, A&N Islands and Lakshadweep.

₹

Enter only a separately confirmed state or DISCOM benefit.

Financial Assumptions

%/yr
%/yr
System financial lifetime 25 years
REQUIRED SYSTEM SIZE
2.8
kWp
5
550 Wp panels
EST. ANNUAL GENERATION
3,915
kWh/year
ROOF AREA REQUIRED
26
m² (with spacing)
13 m²
panel footprint only
GROSS INSTALLED COST
₹1,51,250 – ₹2,06,250
at ₹55–₹75/Wp • 1.5–3 kWp band
SUBSIDY SAVINGS
₹73,500
NET COST AFTER SUBSIDIES
₹77,750 – ₹1,32,750
₹73,500 central CFA + ₹0 additional
FINANCIAL SAVINGS
Estimated avoided electricity purchases
FIRST-YEAR BILL SAVINGS
₹28,800
Current bill: ₹2,400/month
5-YEAR SAVINGS
—
10-YEAR SAVINGS
—
25-YEAR SAVINGS
—
ESTIMATED PAYBACK
— years
Range reflects low-to-high net installed cost
25-YEAR SIMPLE ROI
—%
(Bill savings − net cost) ÷ net cost

Nominal estimate assuming constant consumption, 3.0% annual tariff escalation and 0.5% annual module degradation.

Panel: 550 Wp • 2.28 m × 1.13 m = 2.58 m² each
Indicative all-inclusive on-grid cost; excludes batteries, roof strengthening and unusual DISCOM works.
Cost basis: indicative Indian market ranges checked August 2026, calibrated against installed-price guides and the MNRE benchmark/CFA structure. Vendor quotes vary by city, module and inverter brand, structure height, taxes and scope. Verify eligibility and current rates on the PM Surya Ghar portal.