About this calculator

Annual generation (kWh) = kWp × PSH × 365 × 0.80 (system losses). Value = self-consumption × import price + export × feed-in tariff. Payback = net install cost ÷ annual value.

Frequently asked questions

What does the Solar Panel Break-Even do?

Payback period for a rooftop PV array from local peak sun hours, electricity tariff and export price. Annual generation (kWh) = kWp × PSH × 365 × 0.80 (system losses). Value = self-consumption × import price + export × feed-in tariff. Payback = net install cost ÷ annual value.

Is the Solar Panel Break-Even 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 Panel Break-Even?

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 Panel Break-Even need?

Enter values for: System size (kWp), Peak sun hours/day, Self-consumption %, Import price (€/kWh), Export/FIT (€/kWh), Install cost (€). Sensible defaults are pre-filled where possible so you can start with a single change.

Can I embed the Solar Panel Break-Even 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.