Solar panels are an efficient and cost-effective way to generate clean, renewable energy for your home or business. However, like any other equipment, they require regular maintenance to ensure they are operating at their best.

How Cleaning Your Solar Panels Can Save You Money

Dirty solar panels don’t absorb as much sunlight, which reduces their ability to generate electricity. Over time, dust, pollen, bird droppings, and debris can block sunlight and lower your panel’s efficiency by 10-25%.

By keeping your solar panels clean, you can:

• Maximise energy production, ensuring you generate as much electricity as possible.
• Reduce electricity costs if you're on a solar feed-in tariff or rely on solar for home energy use.
• Extend the lifespan of your panels, preventing long-term damage and avoiding costly repairs or replacements.
• Improve return on investment (ROI) by ensuring your panels produce the energy they were designed for.

A well-maintained solar panel system will pay for itself faster compared to one that is left dirty and underperforming.

Why Cleaning and Maintaining Your Solar Panels Is Important

Solar panels are an excellent way to generate clean, renewable energy while reducing electricity costs. However, to maintain their efficiency and longevity, regular cleaning and maintenance are essential. Over time, dust, dirt, leaves, and bird droppings can accumulate on the surface, blocking sunlight and reducing energy production.

By following a simple maintenance routine, you can keep your solar panels working at peak performance and maximise your energy savings. Here’s everything you need to know about cleaning and maintaining your solar panels.

However, if your solar panels are mounted high on your roof and difficult to access, consider hiring a professional solar panel cleaning service. Climbing onto a roof without proper safety equipment can be dangerous, and professionals have the right tools to clean your panels efficiently and safely.

Step-by-Step Guide to Cleaning Your Solar Panels

Step 1: Inspect Your Panels for Damage

Before cleaning, it’s important to check your solar panels for any cracks, chips, or loose connections. Damage can affect performance and, in some cases, make cleaning unsafe.

• Look for visible cracks or discolouration that may indicate wear and tear.
• Check the mounting hardware to ensure it is secure and not loose.
• Inspect electrical connections for signs of corrosion or fraying.

If you notice any damage, contact a professional solar technician before cleaning to prevent further issues.

Step 2: Gather Your Cleaning Supplies

Cleaning your solar panels doesn’t require expensive products. You can use simple, non-abrasive materials to get the job done safely.

You will need:

• A soft-bristled brush or microfiber cloth to remove dirt without scratching the panels.
• Water to rinse off dust and grime.
• A mild detergent or soap (optional) for tougher stains, but avoid harsh chemicals.
• A hose or spray bottle to gently rinse the panels.
• A squeegee or dry cloth to prevent water spots.
• A ladder or extension pole if your panels are mounted on the roof.

Avoid using pressure washers or abrasive cleaning tools, as they can damage the panel’s surface.

Step 3: Remove Loose Debris

Before washing the panels, clear any leaves, twigs, or bird droppings that may have accumulated.

• Use a soft brush or cloth to gently remove debris.
• If your panels are on the roof, use a long-handled brush or hose to avoid climbing.
• Never use metal tools or sharp objects, as they can scratch or crack the glass.

Step 4: Clean the Panels with Water and a Soft Cloth

Once the loose debris is removed, wipe the panels down carefully:

• Use a microfiber cloth or soft sponge with clean water to remove dirt.
• If necessary, mix a small amount of mild soap with water for stubborn stains.
• Wipe in a circular motion to avoid streaks.

For hard-to-reach panels, use a long-handled mop or extension pole to clean safely from the ground.

Step 5: Rinse the Solar Panels Thoroughly

After wiping down the panels, rinse them with clean water to remove any remaining dirt or soap.

• Use a hose with a gentle spray setting to prevent damage.
• Avoid using high-pressure water, as it can weaken the panel’s seals over time.
• Make sure all soap residue is removed, as it can leave streaks and attract more dirt.

Step 6: Dry the Panels to Prevent Water Spots

Leaving water droplets on the panels can cause streaking and water spots, reducing their ability to absorb sunlight.

• Use a squeegee to remove excess water.
• If necessary, wipe the panels with a dry, lint-free cloth.
• Alternatively, let them air dry naturally if you’re cleaning on a warm, sunny day.

Step 7: Check the Mounting Hardware and Connections

After cleaning, inspect the mounting brackets and electrical components to ensure everything is secure.

• Look for any loose bolts or screws that may need tightening.
• Check that the panels are still positioned correctly for maximum sunlight exposure.
• If you notice any electrical issues, contact a solar technician instead of attempting DIY repairs.

Additional Maintenance Tips to Keep Your Solar Panels Efficient

Cleaning is just one part of maintaining your solar panels. Here are a few other important steps to keep them performing at their best.

Monitor Your Solar Energy Production

Most solar systems come with a monitoring system that tracks your energy output.

• Check your system’s energy readings regularly to ensure efficiency.
• A sudden drop in power could indicate dirt build-up or a technical issue.
• If you notice performance issues, schedule an inspection with a professional.

Check for Shading Issues

As trees grow or buildings change, your panels may experience new shading that reduces energy output.

• Trim back trees or bushes that may block sunlight.
• If you have a movable solar system, adjust the angle to optimise exposure.
• Consider repositioning panels if shading becomes a persistent issue.

Schedule Professional Inspections

Even with regular cleaning, it’s a good idea to have a solar panel expert check your system every 2-3 years.

• A professional can detect hidden issues, such as wiring faults or panel degradation.
• They can ensure your inverter and battery storage are working efficiently.
• Regular inspections help extend the lifespan of your solar system.

Prepare for Seasonal Changes

Different seasons can affect your solar panel maintenance needs.

• In autumn, remove fallen leaves that may collect on the panels.
• In winter, clear snow or frost if you live in a colder climate.
• During spring and summer, check for increased bird droppings or dust build-up.

Final Thoughts

Regular cleaning and maintenance are essential to keep your solar panels working efficiently. By removing dirt, checking for damage, and monitoring performance, you can maximise energy production and extend the lifespan of your system.

By following these simple steps, you’ll ensure that your solar panels continue to generate clean, renewable energy for years to come.