A brighter picture
of your solar potential.
Explore the seasons, compare months and see a simple estimate for your system size.
UK postcodes are looked up with Postcodes.io. Selected coordinates are sent to NASA POWER for seasonal averages; weather mode uses Open-Meteo. No account or inverter login.
rough solar potential · horizontal baseline
Month by month
Select a month to see its average daily sunlight and energy estimate.
Historical averages help you understand the seasons. Roof angle and nearby shade can change actual output substantially.
estimated generation
Your week, at a glance
Tap a day to exploreGeneration through the day
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A promising time to run an appliance. Your home’s other energy use and battery affect how much solar is available.
Your panel setup 4 kWp · south-facing
Where these numbers come from
Forecast sunlight on your panel angle × system size × remaining output after losses. Estimates exclude nearby shading, snow, inverter clipping and household demand. This planner uses a system-size estimate; the mobile app also has a calibrated best-day model.
Peak sun hours measure energy per square metre. They are different from daylight hours and from your panels’ kWh output. Forecasts are not meter readings.