Solar Savings Calculator
Calculate Your Solar Savings
Instant rooftop plant sizing, government subsidy, and savings returns.
Includes automatic PM Surya Ghar Central Subsidy — ₹78,000 for residential installations.
Transparent Sizing Methodology
How This Solar Calculator Models Your System in Kerala
Unlike generic web calculators that use nationwide averages, our tool is calibrated specifically for Kerala's tropical solar irradiance (~4.0 peak sun hours/day) and KSEB's bi-monthly domestic tariff slabs (LT-1A).
What the Inputs Mean
Bi-Monthly Bill: KSEB bills residential consumers every two months. Telescopic tariff slabs increase steeply above 250 units bimonthly.
Roof Area: Modern high-efficiency 550W+ TOPCon modules require roughly 80–100 sq.ft of shadow-free rooftop space per 1 kW of installed capacity.
The Sizing Formula
Our model converts your bi-monthly bill into estimated kWh units consumed. It divides by 60 days to find your daily unit requirement, then applies an average generation factor of 4.0 kWh/day per 1 kW in Kerala.
Capacity (kW) = (Units/Month / 30) ÷ 4.0
PM Surya Ghar Subsidy
Central government direct bank transfer (DBT) subsidy under the national scheme:
- • 1 kW System: ₹30,000
- • 2 kW System: ₹60,000
- • 3 kW & Above: ₹78,000 (Max Cap)
While our calculator provides accurate budgetary guidance based on standard conditions, actual rooftop generation and project investment depend on site-specific engineering factors that require a physical survey:
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