Solar energy yield calculator

Enter your system size to get annual, monthly and daily energy and a 20-year total. Add a price per kWh for a rough value.

System sizekWpHome roof 3–10 kWp, small plant 100 kWp, 1 MWp = 1,000 kWpPeak sun hours per dayh≈2.5 northern Europe, 3.5–4.5 much of the US, southern Europe and East Asia, 5+ desertsYearly degradation%Typically 0.4–0.5 %Price per kWh (optional)/kWhYour tariff or feed-in price, any currency

Result

First-year energy–

Monthly average–

Daily average–

Per kWp per year–

20-year total–

First-year value (rough)–

20-year value (rough, fixed price)–

Rough estimate. Real output depends on local weather, orientation, tilt, shading and temperature. The app uses PVGIS weather data for your location plus your real layout and shading.

How it works

First-year energy = system size × peak sun hours × 365. The 20-year total reduces each year by the degradation rate. Formulas and factors are in how to calculate energy yield.

Get the real number for your site

Draw your site on the satellite map: the app uses local weather data, your real layout and 3D shading. Free, nothing to install.

Try it free →

FAQ

Where do I find peak sun hours?

Free tools such as PVGIS give the annual irradiation for any location. Divide the yearly kWh per kWp by 365 to get peak sun hours.

What price should I enter?

Your retail tariff if you use the power yourself, or the feed-in or PPA price if you sell it. The result assumes the price stays the same for 20 years.