UK · London

How dirt and soiling reduce your solar output in London

Panel soiling — the accumulation of dust, pollen, bird droppings, and other debris — is one of the most common and fixable causes of solar energy loss. In arid regions, soiling alone can reduce output by 5–15%. Here's what you should know.

London has a maritime climate with 3.8 peak sun hoursper day. The UK's cooler temperatures benefit panel efficiency but shorter daylight hours affect annual output.

Related issues

Panel soiling

common

Dust, pollen, bird droppings, or debris accumulation reducing light absorption. More severe in arid or agricultural areas.

Typical loss: 215%

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Based on conservative solar performance modelling and published degradation data

NRELIEA-PVPSSunSpecPVsyst+ published research

Updated April 2026 · Structured performance modelling

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