Location Guides14 August 20262 min read

Plug-In Solar in South East England: Best Region for Savings

Kent, Sussex, Surrey — the South East gets the most sun in the UK. Here's what an 800W kit can save you.

🇬🇧This article is relevant for the UK market

The UK's Solar Sweet Spot

South East England receives the most solar irradiance in the UK — roughly 10-15% more than the national average. An 800W system here generates 900-960 kWh/year.

Area Annual kWh Annual saving Payback (£600)
Kent coast 960 £130 4.6 years
Sussex 945 £127 4.7 years
Surrey 920 £124 4.8 years
Hampshire 930 £125 4.8 years
Berkshire 910 £123 4.9 years

Why the South East Outperforms

  1. Lower latitude (50-51°N) = higher sun angle
  2. Coastal effect = less cloud cover than inland
  3. Drier climate = more clear-sky days
  4. Longer summers in terms of effective solar hours
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Is London part of the South East for solar purposes?

Broadly yes — London generates similarly to Surrey/Kent. Urban shading from buildings is the main differentiator.

What's the best time to install in the South East?

Spring (March-April) captures the most generation in your first year. But September 2026 — when kits launch — is still excellent.

Related reading

See how much plug-in solar could save you — with real data for your postcode.

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