Solarcast
7-day UK solar estimate powered by Open-Meteo
Location (UK)
Use UK town or postcode
Panel strings
Add string
Main roof
4.0 kWp · South · tilt 35° · loss 14% · cal 1.00
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Name
kWp
Tilt
Direction
North
North-East
East
South-East
South
South-West
West
North-West
Losses %
Cal
Remove string
Battery (kWh)
Start SoC (%)
Round-trip efficiency (%)
Daily usage (kWh)
Advanced forecast tuning
Forecast bias (%)
Overall output scaling. Raise if forecasts are consistently low.
Temp coeff (%/C)
Panel power change per deg C above 25C (usually negative).
NOCT rise @800W/m2 (C)
Estimated panel temperature rise above ambient at strong sun.
Sunny direct threshold
Hourly direct radiation needed to count as a sunny hour.
Sunny cloud max (%)
Maximum cloud cover allowed for a sunny-hour count.
Export limit (kW, instant)
Grid export power cap from your inverter/export settings.
Build forecast
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Forecast Awaits
Set your inputs on the left and click Build forecast.
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