Worked example
A 3 kW rooftop system for a Kerala home using 300 units/month costs about ₹1,65,000.00, drops to ₹87,000.00 after the ₹78,000.00 PM Surya Ghar subsidy, saves ~₹23,404.50/year, and pays back in about 3.72 years.
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Payback period and savings from a rooftop system
Payback period
3.72 yrs
then ~₹23,404.50/year saved
- System cost
- ₹1,65,000.00
- PM Surya Ghar subsidy
- −₹78,000.00
- Net cost
- ₹87,000.00
- Annual generation
- 4380 units
- Monthly savings
- ₹1,950.38
- 25-year net savings
- ₹4,98,112.50
Assumes ~4 units/kW/day generation and Kerala State Electricity Board Ltd (KSEB) tariff; actual output varies with location, shading and panel quality.
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Frequently asked questions
How much does a rooftop solar system cost in Kerala?
A 3 kW system costs about ₹1,65,000.00 before subsidy in our estimate, dropping to ₹87,000.00 after the PM Surya Ghar central subsidy. Actual installer quotes vary by panel type, roof condition and local installation costs.
Does this use KSEB's real tariff?
Yes — savings are computed against KSEB's actual telescopic slab tariff, so solar is valued at offsetting your real, most expensive units first, not a flat national average rate.
What subsidy is available?
PM Surya Ghar: Muft Bijli Yojana, the central government scheme, pays ₹30,000/kW for the first 2 kW and ₹18,000 for the 3rd kW, capped at ₹78,000 — the same nationwide, regardless of state.