Free tool
Solar ROI calculator
Estimate payback period, annual savings, 25-year return and avoided CO₂ for a commercial PV system. No sign-up required.
Payback period
4.5 yrs
Net savings / year
€ 47,475
Annual output
362,500 kWh
Total investment
€ 212,500
25-year ROI
426%
CO₂ avoided / year
126.9 t
How to read these results
This estimate assumes 0.5% annual degradation over 25 years and a grid emission factor of 0.35 kgCO₂/kWh. It does not model export caps, local shading, soiling or incentives — factors that commonly move payback by one to two years.
The TerraAI Solar PV Optimizer models those site by site, using satellite irradiance data and your actual load curve.