A free, personalised solar generation forecast for wherever you are. Pick your city or country below, or get the app for a forecast built around your own panels.
A solar forecast predicts how much electricity your specific solar panels will generate over the coming days, based on weather data — different from a weather forecast, and different from a manufacturer’s spec sheet, which only shows a lab-tested ceiling.
Sun Hours covers dedicated city pages for Manchester, Birmingham, Glasgow, Munich, Berlin and Hamburg, plus country-wide coverage for the UK, USA, Germany, Spain and Australia. For anywhere else, the free app gives a personalised forecast for any location worldwide.
What's the difference between the city pages and the app?
The city and country pages show general peak-sun-hour data for that area. The free app personalises the forecast to your exact location and your own system's best-ever day, which is a more accurate, individual number than any area-wide average.
Is a solar forecast the same everywhere in a country?
No — it can vary a lot within one country. Munich gets noticeably more sun than Hamburg, and Perth gets more than Melbourne, despite being the same country. That's why Sun Hours breaks forecasts down by city and, in the app, by your exact location.
☀ Sun HoursFree solar forecast app · now on iOS & Android