Solar Panel Maintenance
Why panels need a little care
Solar panels have no moving parts, so they need far less care than a boiler. Even so, dust, moss and bird droppings can block light and cut output. Loose fixings and worn connectors can also cause faults.
Rain keeps most panels fairly clean, particularly on a steep roof. However, shallow roofs, trees and coastal air all add dirt faster. A short check each year catches problems early.
What a maintenance visit covers
- Visual check of panels, mounting rails, roof seals and cable runs.
- Electrical testing of strings, isolators and earth connections.
- Inverter check, including error logs and ventilation.
- Cleaning with soft brushes and purified water where it is safe to reach the panels.
- A written report with readings and any repairs you should plan for.
How often to service and clean
Many installers suggest a check every one to two years, but follow your own warranty. Some warranties ask for evidence of servicing, so keep every report. A baseline check in the first year also confirms that the installation settled well.
Cleaning is optional for many roofs. If your monitor shows output falling against the same weeks last year, that is a good reason to book one. Never climb onto a roof to clean it yourself, because the risk of a fall is high.
Signs that something is wrong
Watch your monitoring app for a sudden or steady drop in output. Look for error lights on the inverter, damp patches in the loft and cracked glass. Any of these is a reason to call an installer.
A falling total can also come from a long run of grey weather, so compare like with like. For a structured review of an older system, see our page on system health checks.
Costs and who to ask
Prices depend on roof height, access and the number of panels, so request a quote for your own home. Beware of door-to-door cleaners who offer a cheap wash, because poor technique can scratch the glass or void a warranty. Choose a firm with MCS certification where possible.
Maintenance suits every region we cover. Installers working in the areas of solar panels in Manchester and solar panels in Birmingham can quote for visits as well as new systems. Our guide on whether solar panels are worth it shows why upkeep protects the return.
Solar Panel Maintenance: common questions
How often should solar panels be serviced?
A check every one to two years is common, but your warranty terms come first. Coastal homes and roofs under trees may need more frequent visits, since dirt builds up faster there.
Does servicing affect my warranty?
It can. Some manufacturer and installer warranties ask for evidence of regular checks, so keep every report and read the terms you received.
Can I clean solar panels myself?
You can rinse panels from the ground with a hose if you can do so safely. However, do not climb onto the roof or use harsh chemicals, because both create risk.
How do I know if my panels need cleaning?
Compare your monthly output with the same months last year. If it has fallen although the weather was similar, ask an installer to inspect and clean the array.
Ready to talk about solar panel maintenance?
Tell us about your property and we will pass your enquiry to MCS-certified installers who cover your area.