How to Maintain and Clean your Solar Panels

Keeping your solar panels clean and well-maintained is essential to ensure optimal energy output. However, for most commercial setups, frequent cleaning isn’t necessary. In the UK, solar panels are generally self-cleaning due to regular rainfall. This blog covers when cleaning may be beneficial, how to do it safely, and how Sunpower Services can assist with installing and maintaining solar panels for your business.

When to Clean Solar Panels

In the UK climate, solar panels are generally low-maintenance and self-cleaning. The rain naturally helps clear away most dust, dirt, and debris, which keeps the panels running efficiently. Studies and long-term data show that in typical UK conditions, dirt accumulation doesn’t significantly impact the system’s output, even over several years.

However, there are some instances where a cleaning routine might help boost efficiency. For example, if your panels are located in particularly dry or dusty areas, debris might accumulate faster. Similarly, bird droppings, heavy pollen, or pollution can affect the panels if they are near a busy road or industrial area. Panels with less than a 5-degree tilt may also accumulate dirt more easily. These flat surfaces don’t allow rain to wash away debris as efficiently as angled panels.

If you’re concerned about any decline in energy production, contact Sunpower Services. We can help review your system’s energy output to see if cleaning could be beneficial.

How to Clean Solar Panels Safely

For most commercial solar panel systems, particularly roof-mounted ones, it’s best to let professionals handle any cleaning. However, if you have ground-mounted panels and wish to clean them yourself, here are some essential guidelines.

1. Prioritise Safety

   Safety is paramount when cleaning solar panels. Before you begin, shut down the system to avoid potential hazards. Refer to the shutdown instructions in your installation schematics. However, remember that rooftop cabling will remain live, carrying high voltages even when the system is off. If you see any damaged cables, report them immediately and do not proceed.

2. Roof-Mounted Panels

   Roof-mounted solar panels should always be cleaned from the ground whenever possible. If you must access the rooftop, ensure that you have the appropriate safety equipment and training. Working at height can be dangerous without the right preparation, so consider hiring professionals if you’re unsure.

3. Recommended Equipment

   For ground-mounted systems, use a soft brush with a long handle to reach across panels without scratching them. A squeegee with a plastic blade and a cloth-covered sponge is ideal for loosening grime and leaving a streak-free finish. When it comes to water, a hose with a spray nozzle allows you to rinse the panels effectively. For the best results, use harvested rainwater, as hard water can leave mineral deposits on the panels.

4. Timing and Weather Considerations

   Clean solar panels during overcast days, early in the morning, or in the evening. If cleaned in direct sunlight, water can evaporate too quickly, leaving streaks or mineral deposits. Early morning is often best, as any dew that’s accumulated can help soften dust or dirt, making it easier to clean.

5. Cleaning Process

   If the panels are dry, start by brushing away loose dust and debris with a soft brush. This step helps avoid streaks. Use a hose to spray the panels gently, avoiding high-pressure settings, as this could damage the panels. After rinsing, use the squeegee to remove any excess water to prevent hard water stains.

By following these steps, you can keep your panels clear and ready to harness sunlight effectively, even in challenging environments.