Solar panels are one of the best ways to cut energy bills and reduce reliance on the grid, but to get the most out of them they need to be kept clean. Over time, panels naturally collect dust, bird droppings, pollen, moss and general grime. Even a thin layer of dirt can block sunlight from reaching the surface of the panels, lowering energy output and reducing efficiency.
According to the Energy Saving Trust (2023), a typical home solar PV system in the UK can save households up to 60% on their annual electricity bills. However, dirty panels can reduce performance by between 5% and 20% depending on local conditions (British Solar Association, 2022). That lost efficiency means higher reliance on grid electricity, increased bills, and less return on your solar investment.
With rising energy costs, making sure your solar system runs at full capacity has never been more important. Clean panels not only generate more energy but also help you get the maximum return on your investment.
Why clean panels matter
- Better efficiency – Clean panels can generate significantly more energy, ensuring you benefit from every ray of sunlight.
- Lower bills – Higher efficiency means you need to import less electricity from your energy supplier. This is especially important as energy prices remain high across the UK.
- Longer lifespan – Preventing the build-up of dirt helps protect the glass and panel surfaces, avoiding potential degradation over time.
- Warranty protection – Many solar panel manufacturers and energy companies note that maintenance, including cleaning, may be required to keep warranties valid.
- Peace of mind – A professional clean is also a good opportunity to spot early signs of wear or damage before they affect performance.
🌞 Did you know?
· Dirty solar panels can lose up to 20% efficiency, meaning less energy and higher bills.
· Bird droppings are a leading cause of solar panel hotspots, which can permanently damage cells.
· Regular cleaning helps you get the maximum return from your solar investment.
How we do it at Cannins
At Cannins, we use purified water and non-abrasive, specialist equipment designed specifically for solar panels. This ensures panels are cleaned safely and thoroughly, without causing damage or affecting warranties. Our system is ladder-free too, which makes it safer and more efficient for both homes and businesses.
How often should panels be cleaned?
Most UK systems benefit from a clean at least every six months. However, properties near farmland, trees, or busy roads may need more regular attention. Keeping panels free from dirt is one of the simplest ways to ensure that you are getting the maximum energy yield and financial return from your solar investment. Contact us for a free quote today.
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References
British Solar Association (2022) The impact of panel cleanliness on solar PV performance. London: BSA.
Energy Saving Trust (2023) Solar panels: electricity savings explained. Available at: https://energysavingtrust.org.uk/advice/solar-panels/ (Accessed: 20 August 2025).
Solar Energy UK (2021) Maintaining efficiency in solar PV systems. London: Solar Energy UK.