One of the reasons solar panels have become so popular is that they’re incredibly reliable and require very little upkeep compared to other energy systems.
With just a bit of routine care, you can keep them working at peak efficiency for decades, saving money and reducing your carbon footprint along the way.
Quick Answers
- Do solar panels need cleaning? Yes, occasional cleaning improves performance.
- How often should you clean them? Usually once or twice a year, depending on location and conditions.
- Can you clean them yourself? Only if they’re safely accessible — otherwise, hire a professional.
- How long do panels last? Around 25–30 years with basic care and servicing every 5–10 years.
Do Solar Panels Need to Be Cleaned?
Why Dirt, Dust and Debris Affect Performance
Although solar panels are designed to be durable and efficient, they still rely on having clear access to sunlight. Over time, everyday grime can build up, from bird droppings and moss to pollen, leaves and air pollution. Even a thin film of dirt can block light from reaching the solar cells.
What many people don’t realise is that shading doesn’t just affect the spot that’s covered. If one panel, or even part of a panel, is shaded, it can bring down the performance of the whole system.
Studies show that dirty panels can reduce efficiency by as much as 20–25%, which means less power for your property and a longer wait to see a return on your investment.
Does Rain Clean Solar Panels?
It’s a common belief that rainwater will do the job for you, but in reality it only goes so far. While rain helps wash away loose dust, it won’t shift sticky residue like bird mess or built-up grime. In fact, water can sometimes leave streaks or mineral deposits behind.
To keep panels working at their best, a proper clean every so often is worthwhile. That way you avoid the slow but steady energy loss that comes from letting dirt and debris accumulate.
How to Clean Solar Panels Safely
When and how often should you clean solar panels?
Most solar panel systems in the UK only need cleaning once or twice a year. For many homes, spring and autumn are ideal times, as panels are clear for summer peak generation and free from winter debris.
If your property is close to trees, pigeons, farmland, or busy roads, you may find more frequent cleaning is worthwhile, as dirt and droppings can build up faster in these settings.
Cleaning solar panels on the roof safely
Safety always comes first. Solar panels should be switched off before any cleaning begins to reduce risk. If your panels are accessible from the ground, a gentle rinse with a standard garden hose is often enough to lift loose dirt.
For rooftop panels, however, it’s best to call in a professional. Climbing onto a roof without proper training and equipment can be dangerous and may even damage the panels or roof structure.
What to avoid when cleaning
It’s important to steer clear of pressure washers, abrasive brushes, or strong detergents. These can scratch the surface or strip protective coatings, leading to reduced efficiency and shorter panel lifespan.
Likewise, DIY roof access without the right safety gear carries risks that outweigh the benefit of a quick clean. Keeping your panels clear is important, but it should never come at the cost of your safety.
Professional Solar Panel Maintenance
What’s involved in a solar panel service?
While solar panels are low maintenance, a professional service is the best way to keep them performing at their peak.
During a service, we check every part of the system, from the physical condition of the panels and their mounting frames to the wiring and connections. We also test inverter performance, as inverters do more of the heavy lifting than the panels themselves.
Monitoring energy output is another key step, as even a small dip in generation can signal that something isn’t working as it should.
Most systems will also need their inverter replaced once during their lifespan, usually every 10–15 years, and regular servicing helps us spot when that time is approaching.
How often should you get solar panels serviced?
We usually recommend a professional service every 5 to 10 years, depending on the size of your system and its environment. Regular checks help us pick up small issues early, before they grow into costly repairs or start cutting into your energy savings.
Think of it as a way of protecting your investment and making sure your panels continue to deliver reliable, clean energy for decades to come.
If you’re looking for installation or ongoing care, our team at Bolton Electrical Services provides both solar panel systems and battery storage solutions designed to maximise efficiency.
How Much Does Solar Panel Cleaning and Maintenance Cost?
Average prices for UK homeowners
Solar panels are one of the most cost-effective renewable systems available, but like any investment, a little care goes a long way.
In the UK, professional solar panel cleaning usually costs between £4 and £15 per panel, or around £100 to £250 per visit, depending on how many panels you have and how accessible they are.
A full service, which includes checking inverters, wiring, and performance, generally falls in the same range of £100 to £250, with larger systems costing more.
Long-term savings vs short-term cost
It can be tempting to skip cleaning or servicing, but neglected panels can lose up to a quarter of their potential output when dirt or faults go unnoticed.
By keeping panels clean and arranging routine maintenance, you avoid unnecessary repairs, extend the lifespan of your system, and protect your return on investment.
Compared to the cost of replacing a damaged panel or a faulty inverter, regular upkeep is a small price to pay for reliable, efficient solar energy.
At Bolton Electrical Services, we focus on helping you get the very best from your system. While we don’t provide panel cleaning ourselves, our expert team is always here to advise on solar panel maintenance in the UK and ensure your installation continues to perform year after year.
Extra Maintenance Tips for Peak Performance
Keep panels free from shade
Even the best solar panels will underperform if they spend part of the day in shadow. We always recommend keeping trees trimmed and removing moss, ivy, or any other growth that could creep onto your roof.
Clear, direct sunlight keeps your system working at its best.
Check inverters and system status
Your inverter is the heart of the system, converting the power your panels produce into usable electricity.
A flashing green light usually means everything is running smoothly. If you see an error code, a red light, or notice a sudden drop in output, it’s important to act quickly before a small issue turns into a bigger fault.
Monitor performance and log maintenance
It’s worth keeping an eye on your daily or weekly energy output so you can spot any changes early.
A simple logbook of cleaning dates, inspections, and any professional visits can be invaluable.
Not only does it help track your system’s health, but it also supports warranty claims and gives professionals a clearer picture when they service your panels.
Solar Panel Care in the UK Climate
Is UK weather good or bad for solar panels?
Many people assume the British climate isn’t ideal for solar, but the opposite is true. Our mild conditions actually help panels last longer because they aren’t exposed to the extreme heat or heavy snow seen in other countries.
Rain does its part by rinsing away some dust and debris, although it won’t remove sticky residues like bird droppings or moss.
Another advantage is that snowfall is rare and usually light in most parts of the UK, which keeps winter maintenance requirements low.
Do you need more maintenance in the UK?
For most homeowners and businesses, the answer is no. Solar panels here are largely self-sufficient, provided they’re installed at the right angle and in an area with good sun exposure.
A tilted installation allows rainwater to wash over the panels, helping debris slide away naturally. This means you’ll only need occasional cleaning and routine servicing to keep your system working efficiently.
Frequently Asked Questions (FAQ)
Do I need to clean my solar panels?
Yes. While panels are low maintenance, occasional cleaning keeps them performing at their best and ensures they receive maximum sunlight.
How do you clean solar panels safely?
Always switch off the system first. Use a soft sponge with soapy water or rinse with a hose from the ground. Avoid abrasive tools or pressure washers.
Can I clean my solar panels myself?
Only if they’re easily reachable from the ground. If they’re roof-mounted, it’s safer to use a professional to avoid damaging the panels or risking injury.
How often do solar panels need maintenance?
We recommend a visual inspection twice a year and a full professional service every 5–10 years to keep everything in good working order.
How much does it cost to clean solar panels?
In the UK, cleaning typically costs between £100 and £250 per visit, depending on system size and accessibility.
Can dirty solar panels reduce output?
Yes. Dirt and debris can cut energy production significantly by blocking sunlight.
Do UK solar panels need special care?
Not usually. The UK’s climate is favourable, but it’s still wise to watch out for bird mess, leaves, or moss that could affect performance.
