In this previous post we discussed how home solar panels really are worth it for most UK households. They offer your home greatly reduced energy bills, they cut your carbon footprint significantly and support environmental goals. They also increase your property value and protect you financially against volatile grid energy prices for years to come.
The typical lifespan of properly installed solar panels is 25-30 years, giving you long-term access to these benefits. However, if you don’t look after your solar system properly it won’t be as effective as it could be and the gains from your investment will be reduced. This is why cleaning and maintenance are so important.
Thankfully this isn’t an expensive thing to do, but it does need doing. With that in mind we decided to create this domestic solar panel cleaning and maintenance guide. Read on and discover how to keep your solar system working optimally for its entire lifetime.
Why cleaning and maintenance matters
Professional cleaning delivers extraordinary results for home solar installations. Studies demonstrate that clean solar panels perform 15-25% better than dirty ones, according to the National Renewable Energy Laboratory.
Performance and warranty benefits
This efficiency boost translates to improved savings and enhanced energy generation for your household. Beyond financial gains, regular cleaning often fulfills manufacturer warranty requirements, protecting your solar investment from potential coverage gaps.
Environmental challenge
Solar panels constantly battle environmental contaminants like dust, bird droppings, water residue, and atmospheric pollutants. This accumulation creates a barrier layer that significantly reduces sunlight absorption, impacting power generation capabilities.
Strategic maintenance approach
Most home installations benefit from professional cleaning every 6-12 months, though site-specific conditions may demand more frequent attention. Ground-mounted systems, for instance, typically need more regular maintenance than angled rooftop installations, which benefit from some extent of natural rain cleaning.
System benefits
Regular maintenance extends component lifespan and supports warranty compliance and safety.
Calculate how clean panels affect your savings using our ROI calculator.
When and how often should you clean solar panels?
Home solar installations need regular cleaning schedules to maintain peak performance and protect your investment returns. Research from the University of California shows that uncleaned panels lose 7.4% efficiency in just 145 days. But when and how often should you get yours cleaned?
- Bi-annual cleaning: minimum for most home systems
- Quarterly cleaning: adequate for most installations
- Monthly cleaning: for homes in dusty, agricultural, or coastal environments
Environmental factors
High-dust areas, agricultural zones with pollen and debris, and coastal locations with salt spray require more frequent attention. Monitoring your energy bills and system output helps identify when cleaning becomes necessary before efficiency drops significantly.
Professional maintenance contracts
Many homeowners treat solar systems as long-term household investments, establishing maintenance contracts with installers or specialised service companies. Larger home installations particularly benefit from these arrangements, which are usually more cost-effective than booking maintenance and cleaning ad hoc.
DIY vs professional cleaning
If you can easily and safely reach your solar panels then you do have the option to clean them yourself. However, if the panels are high up – as is usually the case with rooftop installations – we recommend hiring trained professionals.
Professional solar panel cleaners have specialised equipment, expertise and experience, which enables them to do the job to the highest standard, in compliance with health and safety standards.
It’s important to note that rinsing your panels with a hose from ground level doesn’t equate to proper cleaning. It’s better than nothing and is similar to natural rainfall on your panels, so it shouldn’t cause any problems. But to get the best output from the system you’ve invested thousands of pounds in, it’s sensible to make sure they’re cleaned to a professional standard.
Best practices for home panel cleaning
Proper maintenance can dramatically extend the lifespan of a solar system, as well as optimising energy output. Here’s a guide to keeping home solar installations performing at peak efficiency.
What not to do
Never use tap water or harsh chemicals: Tap water leaves mineral deposits that create barriers between sunlight and photovoltaic cells, reducing efficiency by up to 25%. Similarly, harsh chemicals can damage protective coatings and leave residue that attracts more dirt.
Avoid abrasive materials at all costs: Scratched glass disrupts light transmission and means less efficient panels for the rest of their lifetime. For this reason, skip the rough sponges, steel wool, or stiff brushes.
Don’t use high-pressure water jets: Using high-pressure water risks damaging solar panels or their components, so opt for low-pressure instead.
Never walk or stand on panels: Solar panels aren’t designed to support human weight and can crack under pressure, leading to costly replacements and system downtime.
Professional best practices
Safety comes first: For home installations, especially rooftop systems, it’s important to engage certified cleaning professionals. Professionals, like the team here at MD Govier, have specialised equipment, insurance coverage, and height safety training that’s essential for rooftop operations.
Use the right equipment: This includes:
- Soft-bristle brushes with extended handles
- Squeegees with rubber blades
- Clean or purified water systems
- Biodegradable soaps only
- Microfiber cloths for finishing
The professional cleaning process
Timing matters: Clean during cool weather or early morning hours. Hot panels cause water to evaporate quickly, leaving streaks and mineral deposits.
System shutdown protocol: Always power down the system completely before cleaning. This prevents electrical hazards and allows for a thorough inspection of wiring and connections.
Inspect first: Check for damaged cables, loose connections, or panel cracks before beginning. Any electrical damage requires immediate professional attention.
Cleaning technique: Start with a gentle water rinse to remove loose debris. Apply biodegradable soap with soft brushes in circular motions. Rinse thoroughly with clean water, then squeegee dry to prevent water spots.
The bottom line
Proper maintenance isn’t just about aesthetics – it’s about protecting your investment. Clean panels can produce 15-25% more energy than neglected ones. When you consider your household energy needs, this translates to significant savings over the system’s lifespan.
Your home solar maintenance checklist
NEVER DO
- Use tap water (leaves mineral deposits)
- Use harsh chemicals or detergents
- Use abrasive sponges or rough brushes
- Walk or stand on panels
- Clean during hot weather
- Use pressure washers or high-pressure water
SAFETY CHECKS
- System powered OFF before starting
- Check for damaged wiring/cables
- Use professionals for high/difficult access
- Ensure stable, secure footing
- Clean during cool weather/early morning
EQUIPMENT READY
- Clean/purified water
- Biodegradable soap only
- Soft-bristle brush (long-handled)
- Microfiber cloths
- Squeegee with rubber blade
CLEANING STEPS
- Rinse panels with clean water
- Apply biodegradable soap
- Scrub gently in circular motions
- Rinse thoroughly
- Squeegee dry (no water spots)
Remember: Clean panels = 15-25% more energy production!
How MD Govier can help
We at MD Govier are experts in solar panel installation and maintenance and can help keep your home’s system working at optimum output for its entire lifespan. We’re an NICEIC-approved, safety-first team that you can rely on. Request a quote today and book a professional cleaning or inspection service.