Solar ROI & Payback Calculator (India)
Estimate rooftop solar yearly savings, payback, IRR and NPV using India-ready inputs (tariff, export credit, subsidy & self-consumption). Edit the inputs below — results update automatically.
Best for homeowners comparing quotes or checking “how fast will solar pay back?” under your DISCOM rules.
Inputs
System & Costs
Net system cost (₹)
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Generation Assumptions
Usage & Tariff
Replacements & Finance
Key Results
Year 1 net savings (₹)
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Simple payback (years)
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Payback (estimated, years)
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IRR (approx)
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NPV (₹)
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Lifetime generation (kWh)
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LCOE estimate (₹/kWh)
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Charts
Cumulative Cash Flow (₹)
Click to enlarge
Annual Net Cash Flow (₹)
Click to enlarge
Cash Flow Model (Year-by-Year)
| Year | Generation (kWh) | Self-use (kWh) | Export (kWh) | Retail tariff (₹/kWh) | Export rate (₹/kWh) | Savings (₹) | O&M (₹) | Replacement (₹) | Net cash flow (₹) | Cumulative (₹) |
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Tip: If export credit is low, ROI improves more by increasing self-consumption (daytime loads) than oversizing the plant.
How to use (3 quick steps)
1) Enter your real numbers
Fill system cost, subsidy, tariff (₹/kWh), export credit, and self-consumption %.
2) Check payback + ROI signals
See Year-1 savings, payback years, IRR and NPV in “Key Results”.
3) Validate with table + charts
Scroll the cashflow model to spot payback year and any replacement dip (inverter).
Quick accuracy tip: If you’re unsure about self-consumption, start with 60–75% and then test 80–90% after load shifting.
Disclaimer: This calculator provides estimates for planning only. Tariffs, policies, and DISCOM rules vary — verify before decisions.
