Should you wash your solar panels?
incoherency.co.uk
July 27, 2026
4 min read
60/100
Summary
Cleaning solar panels can result in a 2%-5% increase in power output. Dust accumulation over time can significantly impact the efficiency of solar energy generation.
Key Takeaways
- Cleaning solar panels can result in a power output increase of 2%-5%, translating to an annual financial benefit of approximately £60-£150.
- The power output ratio from two banks of solar panels remained stable before cleaning, but showed fluctuations during and after the cleaning process.
- The author experienced a tingling sensation while cleaning the panels, which may have been due to capacitive leakage from the inverter.
- The solar farm, consisting of 16 panels, was installed about 15 years ago and currently generates a peak output of 3.7 kW.
Coverage & discussions
Hacker News · incoherency.co.uk
Community discussions
Historical count: 5 · 5 saved in sample · Historical sample
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Community Sentiment
Positives
- Impressive longevity of a 19-year-old solar system shows how durable quality panels can be — a testament to the technology's reliability.
- Simple maintenance, like a quick monthly clean, can significantly boost output, proving that a little attention goes a long way in solar efficiency.
Concerns
- Concerns about the author's reliance on AI for basic solar panel safety checks raise alarms about the adequacy of their setup.
- Cleaning solar panels regularly can be a hassle, especially for those with installations on tall roofs — it might deter potential buyers from choosing solar.
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