Homeowners · 4 min read · Updated 6 November 2026
Solar panel maintenance checklist for UK homes: monthly to yearly
Monthly checks (five minutes)
- Read the generation meter or app and write down the figure
- Compare it with the same month last year
- Check the inverter for a green or normal status light
- Make sure the monitoring app is online
- Note any error codes and look them up in the inverter manual
A monthly note is the simplest way to spot a fault early. An inverter that has stopped working can go unnoticed for months, because the house simply draws more from the grid and nothing visibly changes. Picking a fixed day, such as the first of the month, makes the habit easy to keep.
Seasonal checks from the ground
| Season | What to look for | Why it matters |
|---|---|---|
| Spring | Pigeons prospecting under panels, pollen film, lichen spots | Nesting starts early and is hard to deal with once eggs are laid |
| Summer | Tree growth casting new shade, droppings, dust from fields | Long days are peak generation and shading costs most now |
| Autumn | Leaves on panels and in gutters, sap from trees | Wet leaves stick and block light, gutters overflow onto paths |
| Winter | Snow lying for days, moss creeping from frames, storm damage | Check for slipped panels or loose cables after high winds |
Use binoculars or your phone camera zoom from the garden or an upstairs window. Do not climb ladders or go onto the roof to inspect panels. Taking a photo from the same spot each season makes changes such as spreading lichen or new nesting easy to compare.
Yearly tasks
- Compare total yearly generation with your installer's estimate
- Book a professional clean if you can see fouling or output has dropped
- Ask for a visual check at the same time for cracks, cables and nesting
- Trim back trees and hedges that have grown into the sun path
- Check gutters below the panels are clear
- Review your export tariff and confirm payments are arriving
- Update your log with photos of the array
Every few years
Many installers recommend a periodic electrical inspection of the system, often every four to five years, and more often for commercial systems. This is separate from cleaning. A qualified installer or electrician can test cables, connections, isolators and the inverter, and check that the array is safe. Inverters are often the first component to need replacement, commonly after 10 to 15 years. Budgeting for this in advance avoids a surprise when the inverter on an older system finally stops.
What to leave to a professional
- Anything involving the roof, ladders or working at height
- Removing nests or droppings from under the array
- Any work on the inverter, isolators, cables or connectors
- Damaged or cracked panels
- Fitting bird proofing mesh
Solar panels produce voltage whenever there is daylight, and the DC side of the system cannot simply be switched off at the consumer unit. That is why electrical work must be left to qualified people.
Keeping a simple solar log
A short log helps with warranty claims, selling the house and spotting problems. It can be a notebook, a spreadsheet or a note on your phone.
- Monthly generation readings
- Dates of cleans and checks, with before and after photos
- Any error codes and what fixed them
- Contact details for your installer and the panel and inverter makes
- Warranty start dates and certificates
If you sell the house, a log with a few years of generation figures and maintenance dates gives buyers confidence that the system has been looked after. It also helps whoever services the system next, because they can see straight away what has been done before.
Extra checks for batteries and add-ons
Many homes now have a battery, an EV charger or a hot water diverter linked to their panels. These add a few items to the routine.
- Check the battery reaches full charge on sunny days and discharges in the evening
- Look at the app for battery warnings or firmware updates
- Keep the area around a battery clear and well ventilated, as the manual specifies
- Check that diverters are heating water on sunny days
- Make sure app and account logins are written down somewhere safe
If a battery is in a garage or loft, follow the manufacturer's guidance on temperature range, as very cold or very hot spaces can reduce performance. Any wiring changes or faults should be handled by the installer.
Frequently asked questions
How often should I have my solar panels professionally checked?
A visual check during a clean every one to two years suits most homes. For electrical safety, many installers suggest an inspection by a qualified installer or electrician every four to five years, or sooner if you notice error codes, burning smells, damage or a sudden drop in output. Commercial systems usually follow a more frequent schedule.
Should I clean my solar panels every year?
Not always. Panels on steep, open roofs often stay clean for longer. A yearly clean makes most sense for homes near trees, farmland, coasts, main roads or railways, for low-pitch or flat roof arrays, and where pigeons are present. Otherwise, clean when you can see dirt, droppings or lichen, or when generation drops compared with last year.
What does a green or red light on my inverter mean?
On most inverters a green or steady light means the system is generating normally, although some show different colours at night or in very low light. A red, orange or flashing light usually means a fault or warning. Check the error code against the manual and follow the restart steps. If the warning returns, contact an installer.
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