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
What Are Plug-In Solar Panels? The UK Guide for 2026
Plug-in solar panels are now coming to UK shops. They cost around £400, plug into a standard socket, and pay for themselves in about 4 years. No electrician. No roof work. Here's everything you need to know.
Sun Hours Is Now on iPhone — Free on the iOS App Store
Sun Hours is now available on iPhone. The same personalised solar generation forecast — postcode, best-day kWh, 7-day hourly curve — free on iOS. No account, no subscription, no tracking.
UK Solar Breaks All-Time Annual Record: 269,000 Installations in 2025
The UK completed 269,000 solar installations in 2025 — the highest annual total ever, 37% more than the year before. 9 of the 10 strongest months on record happened in the last year. New government data explains what is driving it and what comes next.