About this calculator

Payback = system cost ÷ (annual generation × electricity price + export tariff × exported kWh). Assumes 0.5% annual panel degradation.

Frequently asked questions

What does the Solar Payback Calculator do?

Years to pay back a solar PV system from electricity savings. Payback = system cost ÷ (annual generation × electricity price + export tariff × exported kWh). Assumes 0.5% annual panel degradation.

Is the Solar Payback Calculator free to use?

Yes. Every calculator on Calcurly.com is free, works in your browser without sign-up, and can be embedded on your own website.

How accurate is the Solar Payback Calculator?

Results are calculated in real time using industry-standard formulas. Treat the output as a well-informed estimate — always cross-check with local regulations, product datasheets, or a qualified solar & renewables professional before committing to a purchase or a job.

What inputs does the Solar Payback Calculator need?

Enter values for: Install cost, Annual generation (kWh), Electricity price (per kWh), Self-consumption %, Export tariff (per kWh). Sensible defaults are pre-filled where possible so you can start with a single change.

Can I embed the Solar Payback Calculator on my own website?

Yes — copy the iframe snippet at the bottom of this page, or use the Embed Generator to customise the size. The embedded version stays in sync with the live calculator on Calcurly.com.