Solar Panel Maintenance Tips
How to keep your solar panels working efficiently, and what to do when things go wrong.
Solar panels are one of the lower-maintenance home upgrades you can make, but they’re not entirely hands-off. A little regular attention keeps them running at their best and protects the investment you’ve made. Here’s what to do and how often.
At a glance
- Clean your panels at least twice a year to keep efficiency up.
- A yearly professional inspection can catch faults before they become costly.
- Monitor your system’s energy output regularly so you notice any dips early.
- Keep trees and overhanging branches trimmed to avoid shading the panels.
- Check whether your home insurance covers solar panels as part of your buildings policy.
Why Solar Panel Maintenance Matters
Solar panels are built to last, typically coming with performance guarantees of 25 years or more. But dirt, debris, and bird droppings accumulate over time and can reduce the amount of sunlight reaching the cells, cutting output noticeably. According to the Energy Saving Trust, even a thin layer of grime can reduce panel efficiency by up to 5%, and in dustier areas the effect can be more significant.
Beyond cleaning, loose connections, cracked glass, and inverter faults can also affect performance or create safety risks if left unchecked. Catching these early through regular monitoring and annual inspections keeps small issues from becoming expensive ones.
Tip 1: Clean your panels regularly
For ground-level panels or those accessible from a flat roof, cleaning is straightforward. For roof-mounted panels, it’s worth getting a professional in rather than attempting it yourself.
If you’re cleaning them yourself:
- Rinse first. Use a hose to dislodge loose dirt and debris before applying anything to the surface.
- Clean with lukewarm water and a soft sponge or cloth. Avoid abrasive materials that could scratch the glass and steer clear of harsh chemical cleaners, which can leave residue and affect performance.
- Rinse again and leave to air dry. No specialist drying equipment needed.
The best time to clean is early morning or late evening when the panels are cool. Cleaning hot panels in direct sunlight can cause thermal shock and may leave streaks as water evaporates quickly.
Most panels only need cleaning twice a year, though if you live near farmland, a busy road, or in an area with heavy bird activity, you may need to clean more frequently.
Tip 2: Book an annual inspection
A professional inspection once a year is recommended by most manufacturers and is often a condition of keeping your warranty valid. A qualified engineer will typically check for:
- Cracked or discoloured glass
- Loose or corroded wiring and connections
- Inverter performance and error codes
- Mounting bracket integrity
- Signs of water ingress around fixings
Professional maintenance typically costs between £100 and £200 per year, depending on the size of your system and your location. Given that a well-maintained system can generate significantly more energy than a neglected one, it’s a reasonable annual outlay.
Tip 3: Monitor your system’s output
Most modern solar installations come with a monitoring app or web portal that tracks energy generation in real time. Check it regularly, ideally weekly, so you have a baseline sense of what your system normally produces at different times of year.
A sudden drop in output that can’t be explained by weather or seasonal change is usually a sign something needs attention, whether that’s a dirty panel, a shading issue, or a fault with the inverter. The sooner you spot it, the less energy and money you lose in the meantime.
Tip 4: Keep the surroundings clear
Shading is one of the most common causes of reduced solar panel performance. Even partial shading from an overhanging branch or a nearby structure can have a disproportionate effect on output, particularly in systems without optimisers or microinverters.
Check twice a year, ideally in spring and autumn, whether any trees or plants have grown to cast new shadows across your panels. Trim branches where needed, and factor in seasonal changes in sun angle when assessing potential shading.
It’s also worth checking the condition of the roof around your panels periodically. If roof tiles are damaged or displaced, water can get in around the panel fixings and cause problems that go well beyond the solar system itself.
Tip 5: Check your home insurance covers your panels
In most cases, solar panels that are permanently fixed to your roof are covered under your buildings insurance as part of the structure of the property. However, it’s worth checking your policy documents to confirm this, as some insurers treat solar panels as an optional addition that needs to be declared.
If your panels are damaged by a storm, fallen tree, or fire, your buildings insurance should cover the repair or replacement cost. Our guide on solar panel insurance covers what to look for in your policy and when you might need additional cover.
It’s also worth letting your insurer know when you have solar panels installed if you haven’t already. Failing to disclose a significant change to your property can affect a claim down the line.
Before we go
Solar panels are a long-term investment, and a small amount of regular maintenance goes a long way towards protecting that investment. Clean them twice a year, get a professional inspection annually, monitor your output, and keep the area around them clear. Do those four things consistently and your system should perform well for decades.
And if you haven’t already checked whether your buildings insurance covers your panels, it’s worth doing that now rather than finding out when you need to make a claim.
Solar panel maintenance FAQs
How often should I clean my solar panels?
Twice a year is enough for most homes. If you live near farmland, a busy road, or in an area with a lot of bird activity, you may want to clean more frequently. Check output levels regularly, as a dip in performance can be an early sign that cleaning is needed.
Can I clean solar panels myself?
Yes, for ground-level or easily accessible panels. Use a soft sponge or cloth, lukewarm water, and avoid abrasive tools or harsh chemicals. For roof-mounted panels, it’s safer and often more practical to hire a professional rather than work at height.
What happens if I don’t maintain my solar panels?
Dirt and debris reduce the amount of sunlight reaching the cells, cutting energy output. Undetected faults with wiring or the inverter can reduce performance further or create safety risks. Neglecting maintenance can also void your manufacturer’s warranty, leaving you without cover if something goes wrong.
How much does professional maintenance cost?
A professional inspection and clean typically costs between £100 and £200 per year, depending on system size and location. It’s a condition of most manufacturer warranties and a worthwhile annual outlay given the energy and cost savings a well-maintained system delivers.
Are solar panels covered by home insurance?
Permanently fixed solar panels are usually covered under buildings insurance as part of the property structure. Check your policy to confirm, and let your insurer know if you’ve recently had panels installed.
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