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Solar & Electricity Calculator
Planning estimates, reviewed October 2026 — flat-rate math on your figures, not DISCOM slabs or a site survey. Confirm tariffs and sizing with your bill and vendor.
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Payback is system cost ÷ annual savings: ₹1,50,000 of panels saving ₹25,000 of grid electricity a year pays back in 6.0 years. It is the headline figure most buyers want — the point where avoided bills have repaid the installation and every later unit is effectively free generation.
Enter the system cost after subtracting any subsidy (payback on the gross price understates reality), and annual savings from your actual bill at current tariffs — not the vendor's optimistic projection. Rising tariffs shorten real payback while panel degradation stretches it slightly, so simple payback usually lands a little long, which makes it a conservative screen, not a promise.
It does not discount future savings, model degradation or maintenance, or compare against investing the same money elsewhere — simple division, with a fuller financial model as the next step for large systems.
Illustrative math only — not financial advice or a bank quote.
Tax and statutory rules change; verify with a professional.
Only if you enter the net cost after subsidy. Reduce the system cost by any grant you receive for a realistic payback.
Usually they grow as tariffs rise, so simple payback tends to be a conservative, slightly long estimate.
Against a 20–25 year panel life it leaves many free-generation years — but confirm degradation, maintenance, and your tariff trajectory before deciding.
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