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Solar Forecast
Enter a location and PV size to begin.
Tomorrow's solar signal
Enter a location and PV size to see the forecast.
Weather input
Sun, clouds and rain by hour.
Brighter sun means stronger irradiance. Darker cloud means more cover. Blue marks rain risk.
Total sun - sun hitting the roof
Direct sun - strongest clear beam
Scattered light - light through cloud
Clouds - day avg
Forecast Likely range Clear-sky reference Night Best use window
Only real production can teach the model your roof.
GridPassport turns that into more accurate forecasts and battery, inverter and load control.
Tomorrow, in one email
Tomorrow's solar, ready in your inbox.
Expected kWh, likely range and the best four-hour solar window for the PV setup above. Sent daily.
Forecast quality
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Plan the next 72 hours around solar production.
The forecast combines location, PV system size, panel direction and hourly weather into practical production estimates.
- Expected production
- The median PV energy estimate in kWh.
- Likely range
- A lower-to-upper range that makes forecast uncertainty visible.
- Best use window
- The hours with the strongest expected solar output.
- Clear-sky reference
- A comparison with production under clear-sky conditions.
Solar by place
Forecasts for 253 European cities
Compare tomorrow and typical monthly production using the same 10 kWp reference system in 42 countries.