Do solar panels work in the UK climate?
Yes, solar panels work well in the UK. They generate electricity from daylight rather than direct sunshine, so they still produce power on cloudy days. A typical UK system generates around 850 kWh per kWp installed each year, which is why a 5 kWp system produces roughly 4,000 kWh annually, enough to cover a large share of an average home's electricity.
It is a common myth that the UK is too cloudy for solar. In practice, the UK has similar solar resource to parts of Germany, one of the world's largest solar markets. Here is how UK conditions affect output.
Daylight, not direct sun
Solar panels convert daylight into electricity, so they work under cloud, just at reduced output. Long summer days are highly productive, and even short winter days contribute. Output is measured across the whole year, which is why the 850 kWh per kWp UK average already accounts for British weather.
How region affects output
Generation varies modestly across the UK. The south generates a little above the national average, while the north of England, Scotland and Northern Ireland generate slightly below it. The difference between the sunniest and least sunny regions is roughly 15%, far smaller than most people expect.
| Region | Relative output |
|---|---|
| South of England | ~105% |
| Midlands | ~100% |
| North of England | ~93 to 95% |
| Scotland | ~90% |
What this means for savings
Because the regional difference is small, the bigger factors for your output are roof direction and shading, not which part of the UK you live in. A south-facing roof in the north of England will out-generate a north-facing roof in the south.
See output for your postcode
The SunSum calculator uses regional generation data for your postcode, along with your roof direction and shading, to estimate annual output and savings.
Frequently asked questions
- Do solar panels work on cloudy days?
- Yes. Panels generate from daylight, so they produce electricity under cloud, though at lower output than in bright conditions.
- Do solar panels work in winter?
- Yes, though output is lower with shorter days. Annual figures such as 850 kWh per kWp already include winter performance.
- Is the UK too cloudy for solar to be worth it?
- No. The UK has comparable solar resource to Germany, a leading solar market. Roof direction and shading matter more than regional cloud.
Related questions
Indicative estimates based on UK average data. Last updated 26 May 2026.