Sun Hours
Sun Hours for
Solar Panels
Enter your postcode. Tell Sol your best solar day. Get a 7-day generation forecast — no engineer, no complicated setup required.
How it works
Three steps to your solar forecast
Drop your pin
Enter a UK postcode or drop a pin anywhere on the map — Sun Hours works worldwide.
Your best solar day
Tell Sol the most kWh your panels have generated on their sunniest day. That single number tells Sol everything about your system.
7-day forecast
Sol does the rest — a personalised daily generation forecast, updated with live weather data.
See it in action
Simple. Clear. Honest.
No dashboards, no logins, no spreadsheets. Just your solar forecast, beautifully presented.
Two details. That's all.
Enter your postcode and your best-ever solar day — Sol handles the rest.
Today's generation at a glance
See today's kWh, Sol's reaction, and efficiency — the moment you open the app.
7-day forecast with hourly chart
Tap any day for an hourly breakdown of exactly when your panels will be working hardest.
When Sol hits 100% — he lets you know
Peak efficiency days get a special message. Solar should feel good.
The full week, beautifully laid out
Plan your energy usage, EV charging and battery schedules a week ahead.
← swipe to explore →
No complicated setup
No inverter logins, no API keys, no degree in photovoltaics. If you've had solar installed, you're ready.
Real weather data
Live forecasts and historical irradiance from Open-Meteo & NASA POWER — updated daily.
Works anywhere
Optimised for the UK but useful anywhere the sun shines. Drop a pin, get a forecast.
Free Tool
Sun Hours Calculator
Enter any UK postcode or location to see today's peak sun hours — the key metric for how much your solar panels will generate. Download the Sun Hours app for a personalised kWh forecast with an hour-by-hour breakdown.
Solar Knowledge
Learn solar, with Sol
It’s Official: Plug-In Solar Becomes Legal in the UK on 27 August 2026
SI 2026/848 is made: certified plug-in solar kits up to 800 W can legally use a standard UK socket from 27 August 2026. What qualifies and what to do.
Your Plug-In Kit Doesn't Come With a Forecast. We Fixed That.
No export payments means timing is the whole return. The features that turn a plug-in kit into real savings — timers, planners and Sol's forecast.
What's Actually Going On With Plug-In Solar in the UK Right Now?
The full story of plug-in and balcony solar in the UK: the PSSR barrier, the DESNZ consultation and the road to legality — updated for 2026.