QUICK SELF-CHECK
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CALCULATOR • QUICK SIZING • PAYBACK
return on investment calculator
Fast back‑of‑the‑envelope sizing and payback. Adjust a few knobs and see how the economics change.
Tip: If your utility has time‑of‑use rates, your effective value per kilowatt-hour can be higher during peak periods.
Inputs
30-Year Cumulative Cost Chart
Assumes system efficiency 80% (losses from inverter, wiring, temperature, soiling, mismatch).
Results
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Make this estimate more “real”
- Use production estimates from a solar proposal or public tools.
- Add financing APR + term if not paying cash.
- Use your utility’s export rules (net metering vs avoided cost).