Solar ROI

All‑front‑end, lightning‑fast calculator for payback, IRR, NPV, and LCOE. No data leaves your browser.

Inputs

System & Costs

Energy & Tariffs

Tip: Increase the self‑consumption ratio if using a battery or shifting loads. Real‑world values are often 0.3–0.8 depending on habits and storage.

Results

Year Production (kWh) Self‑used (kWh) Export (kWh) Grid price Tariff O&M Savings Net Cashflow Cumulative

Disclaimer: This is a simplified model. Real tariffs, taxes, inverter replacements, and performance vary. Always verify with your installer/utility.