How Often Should Solar Panels Be Cleaned & Serviced? A Dorset Guide

Solar panels are refreshingly low-maintenance, but they’re not zero-maintenance. A bit of care keeps them generating at their best — and in Dorset’s mix of coastal salt, pollen, moss and the odd seagull, that matters more than people think. Here’s how often to clean and service them, and the signs they need attention.

How often should solar panels be cleaned?

For most Dorset homes, a professional clean once a year is a sensible baseline. You may want it more often if you’re near the coast (salt spray), under trees (sap, leaves and bird mess), or on a shallow roof pitch where rain doesn’t rinse them as well. Ground-mounted arrays and low-pitch roofs tend to need it most.

Cleaning vs a full service — what’s the difference?

• Cleaning removes dirt, moss, lichen and bird mess from the panel surface so they capture more light.
• Servicing goes further: checking the inverter, wiring, mounts, isolators and generation figures to catch faults early — the kind of thing that quietly costs you output if left.

Signs your panels need attention

• A noticeable drop in generation on your monitoring app or inverter.
• Visible dirt, moss or streaking, especially along the bottom edge.
• Inverter warning lights or error codes.
• It’s simply been more than a year since anyone looked at them.

Why not just do it yourself?

Climbing onto a roof with water and electrical equipment is exactly the sort of job best left to professionals — for your safety and to avoid scratching the panels or voiding a warranty. A qualified team will clean safely from the ground where possible and check the system is performing while they’re there.

If your panels are due a once-over, our solar panel maintenance and servicing in Dorset keeps them clean, safe and generating properly. It also pairs well with a periodic electrical safety check if your system has been in a while.