When does
solar pay back?
Use the price from a real quotation and your tariff to see upfront cost, yearly savings, payback, NPV and IRR — updated as you type.
Financial estimate
Estimate, not a guaranteePlease correct the highlighted inputs to see your estimate.
–
Simple payback period.
Upfront payment–
Year-1 savings–
Discounted payback–
NPV–
IRR–
Lifetime ROI–
Lifetime net benefit–
Cumulative savings–gross, before O&M & loan
CO₂ avoided–
Grey = still below break-even; black = cumulative gain. “L” = lakh.
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Year-by-year cash flows
| Year | kWh | Savings | O&M | Loan | Net | Cumulative |
|---|
Formulas & assumptions
- Generation in year t = G₁ × (1 − degradation)t−1.
- Savings = generation × self-use × tariff × (1 + escalation)t−1 + generation × (1 − self-use) × export tariff.
- Net cash flow = savings − O&M × (1 + O&M escalation)t−1 − loan payment (standard annuity EMI).
- NPV discounts net flows at your discount rate; IRR is the rate where NPV = 0 (“Not defined” when no such rate exists). Payback is when cumulative cash first turns non-negative.
Estimate, not a guarantee, offer or financial advice. Results depend entirely on the inputs you enter. Tariffs, escalation, export rates, net-metering rules and incentives change and vary by DISCOM — verify them before deciding. No subsidy is assumed unless you enter one.