Solar
Payback maths: is a 3 kW rooftop worth it in Hyderabad?
9 min read · Updated 2026
Real numbers using PM Surya Ghar subsidy, current tariff and average irradiance.
The assumption stack
3 kW system, ₹ 55,000 net cost after subsidy, 4,600 kWh/yr generation, ₹ 7.80 avg tariff.
Result
Annual saving ~₹ 35,880 → payback under 4.2 years. Balance 20+ years is essentially free electricity.
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