Sun Hours for Solar Panels

Will your panels earn anything today? Sun Hours tells you in 8 seconds — just your postcode and your best-ever solar day. No inverter login. No azimuth. No account. No engineering degree.

THE FORECAST
Today's expected kWh before the kettle's boiled. An hour-by-hour generation curve so you know exactly when your panels peak. A 7-day solar forecast with cloud cover and efficiency breakdown for each day. And a 30-day view built from historical weather at your exact location — so you understand your site's full seasonal rhythm, not just this week.
SOL
Every morning, Sol — Sun Hours' pixel-art sun mascot — delivers a personal forecast for your panels before you've touched a chart. When today's forecast matches your all-time best generation day, Sol fires a notification: "It's a 100% day." The solar equivalent of a perfect score. You'll want to share it.
SUN HOURS ALERTS
Opt-in morning notifications that tell you your best two-hour solar window for the day. "Best window today: 11am–1pm." Charge the EV, run the dishwasher, fire up the immersion heater — on your own free electricity, not the grid's. The question every solar owner asks every morning, answered automatically.
SMART APPLIANCE TIMER
Tell Sun Hours what appliances you have. It tells you exactly when to run each one to land inside your solar peak. Washing machine, dishwasher, tumble dryer, EV top-up — scheduled around your free generation, not your habits.
TRAVEL MODE
Portable panels on a campervan? Camping with a folding kit? Drop a pin anywhere or use GPS and get an accurate solar forecast for that exact location — the Lake District, the Scottish Highlands, a clifftop in Cornwall, anywhere. One tap back to your home setup.
WORKS WITH EVERYTHING
Hoymiles, Deye, Marstek, Envertech, APS, Solis, Growatt — and every other rooftop or plug-in setup. No inverter integration needed. If it generates kWh somewhere in the UK, Sun Hours can forecast it.

Free to use. Infrequent, closeable ads. No account. No tracking. Your location never leaves your device.
Built in the UK, for UK solar owners — by someone who got fed up with apps that made a simple question complicated.