Maintenance & Cleaning

Solar panels are one of the lowest-maintenance home improvements you can make — but low maintenance doesn’t mean no maintenance. Keeping your panels clean and your system properly serviced ensures it continues to perform at its best for the full 25 years it’s designed to last, protecting an investment that can be worth £5,000–£10,000 or more.

In the UK, rainfall does a reasonable job of washing away light surface dust. But it won’t shift bird droppings, tree sap, pollen, or traffic film — and research shows that dirty panels can lose 5–25% of their output depending on the level of soiling. For a typical 4kW system generating £500–£700 in annual savings, even a 10% efficiency drop represents a meaningful financial loss.

Professional solar panel cleaning typically costs £80–£150 for a standard residential system of 10–16 panels. Specialist companies use purified deionised water and soft brushes — no chemicals that could damage the glass coating. The recommended frequency for most UK properties is once every 12–18 months, though homes near busy roads, tall trees, or bird nesting sites may benefit from annual cleans.

A full annual maintenance package — covering a professional clean, system inspection, inverter performance check, and mounting hardware review — costs around £100–£300 per year. Regular servicing also helps maintain manufacturer warranties and catches any faults or degradation early, before minor issues become expensive repairs.

DIY cleaning is possible if your panels sit on a low, easily accessible single-storey roof. Use a soft brush on a long pole with clean water only — no detergents, no pressure washers. Never walk on the panels as this will damage the cells and void your warranty. For panels on a first floor or above, always hire a professional for safety.

At SolarBriton, we connect you with trusted local engineers who keep your system running safely and efficiently, year after year.