Cleaning & Maintenance Tips for Solar Panels UK

Solar panels are a valuable long-term investment, offering substantial savings on energy costs for decades. However, proper cleaning and maintenance are crucial to ensure their longevity and optimal performance.

Why Cleaning Your Solar Panels is Essential

Solar panels must remain exposed to sunlight, yet environmental debris—such as dust, bird droppings, dirt, and pollen—can accumulate on their surfaces, inhibiting their efficiency.

Research indicates that a uniform layer of dust can reduce solar panel power output by 13% to 50%. The dirtier your solar panels get, the less efficiently they perform, potentially accelerating corrosion and degradation over time.

Regular cleaning helps to:

Maintain peak efficiency and energy output
Extend the lifespan of the solar panels
Prevent damage caused by corrosive contaminants
Enhance the aesthetic appeal of your property

This guide explores the best practices for cleaning and maintaining solar panels in the UK.

Pro Tip: Avoid hidden fees and complicated service packages—choose a provider with clear, fixed-price quotes. Heatable, a Which?-approved solar installer, offers transparent pricing with no surprises.

How Often Should You Clean Solar Panels?

Cleaning frequency depends on various factors, including:

Environmental Conditions: In areas with high dust, pollution, or airborne debris, panels may require more frequent cleaning.
Birds and Trees: Nearby trees and bird activity can increase debris buildup, necessitating regular cleaning.
Rain Frequency: Rain can help wash away light dust but may not remove stubborn grime or bird droppings.
Energy Output Monitoring: A noticeable drop in production could signal the need for a clean.
Manufacturer Guidelines: Always check for specific recommendations on cleaning frequency and techniques.

Generally, cleaning your panels at least once or twice a year is advised, but high-debris environments may require more frequent maintenance.

Related solar guides:

Safety Precautions for Cleaning Solar Panels

Cleaning solar panels, especially rooftop installations, comes with inherent risks. Follow these essential safety measures:

Turn Off Power: Switch off the system before cleaning to prevent electrical hazards.
Use Proper Equipment: Wear non-slip footwear, gloves, and a safety harness if working at heights.
Check Weather Conditions: Avoid cleaning during rain, strong winds, or snow.
Work with a Spotter: Having someone assist you can enhance safety.
Use Stable Ladders or Platforms: Ensure ladders are secure and avoid overreaching.
Be Mindful of Electrical Components: Avoid spraying water directly on wiring or junction boxes.
Use Gentle Cleaning Methods: Opt for soft brushes, squeegees, and microfibre cloths.
Avoid Walking on Panels: Walking on solar panels can cause damage and reduce efficiency.

Best Methods for Cleaning Solar Panels

Basic Cleaning: Use a soft brush, squeegee, or microfibre cloth with biodegradable soap and water to remove dirt.
Hose Rinse: In cases of light dust accumulation, a gentle rinse with a hose may suffice.
Avoid Harsh Chemicals: Abrasive cleaners or sponges can scratch and damage the panels.
Time Your Cleaning: Clean when panels are cool, such as early morning or evening, to prevent streaking.
Use Long-Handled Tools: Minimise the need to climb on rooftops by using extendable cleaning tools.
Automated Cleaning Systems: Consider self-cleaning mechanisms or robotic cleaners for low-maintenance solutions.

The Role of Solar Panel Cleaning Robots

Solar panel cleaning robots offer an innovative solution for maintaining efficiency while reducing manual labour. These automated devices can remove dirt, dust, and debris without using excessive water. Some models operate emission-free, making them an eco-friendly alternative.

Efficiency Gains: Dirty solar panels can suffer a 7% to 25% efficiency loss.
Cost Savings: Automated cleaning can reduce costs by up to 40% compared to manual methods.
Coverage: Advanced robots can clean 1MW–2MW of panels daily, maximising efficiency.

Additional Maintenance Tips for Solar Panels

Keep Panels Out of Shade: Even partial shading can significantly reduce energy production.
Monitor Performance: Regularly check inverter lights and energy output.
Document Output: Track energy production trends to identify performance drops.
Utilise Monitoring Systems: Many systems provide real-time energy production and efficiency insights.
Consider Professional Maintenance: If you lack the time or equipment, hiring a professional cleaning service ensures thorough upkeep.

Final Thoughts

Cleaning and maintaining your solar panels at least once or twice a year—or more frequently in high-debris areas—helps maintain efficiency and prevent costly damage. Whether you choose to clean them yourself or hire professionals, regular maintenance ensures you get the maximum return on your investment.

By keeping your panels in top condition, you extend their lifespan, optimise energy production, and safeguard your long-term savings.

Sources used in this article:

https://sustainenergyres.springeropen.com/articles/10.1186/s40807-017-0043-y#:~:text=Perusing%20the%20data%20from%20Table,to%20be%20reduced%20approximately%2050%25.
https://www.mdpi.com/1996-1073/16/19/6794