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.
Get it on
Google Play
Coming soon
App Store
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.
Solar Knowledge
Learn solar, with Sol
Introducing Sun Hours: The Simplest Way to See What Your Solar Panels Will Produce
Enter your postcode, tell Sol your best solar day, and get a personalised 7-day generation forecast — no engineer, no complicated setup. Meet the app built for real solar homeowners.
How Many Sun Hours Does the UK Get? A Region-by-Region Guide
From Cornwall's 1,600+ annual peak sun hours to Scotland's 1,200, discover what peak sun hours really mean for your solar panel kWh output across the UK.
Solar Panel Output: How to Estimate Your Annual kWh Generation
Learn the formula solar installers use to estimate kWh output — peak sun hours × panel wattage × system efficiency — with worked examples for UK homes.