How To Clean Solar Panels

Many customers wonder about the necessity of cleaning their solar panels. Generally, in the UK’s climate, solar panels are self-cleaning.

The impact of dust or dirt on the performance of PV systems is minimal, often unnoticeable even after three years. However, cleaning may be the best first step if you have concerns about your system’s output.

When Should Solar Panels Be Cleaned?

In the UK, solar panels are designed to be self-maintaining, requiring little to no manual upkeep. Nonetheless, in specific scenarios, cleaning might be advisable. These scenarios are panels located in dry areas prone to dust accumulation. Or, where panels are installed at an angle less than 5 degrees.

Guidelines for Cleaning Solar Panels

Cleaning roof-mounted systems typically requires professional service. However, if you’re dealing with ground-mounted systems, here are essential safety and cleaning tips:

• Safety Precautions: Always shut down the system before cleaning, as outlined in your installation schematics. Remember, roof cabling remains live and carries dangerous voltages. Do not proceed if you notice any damaged cables.
• Approach for Roof-Mounted Panels: Aim to clean from the ground whenever possible. If rooftop access is necessary, ensure proper equipment and training are in place to guarantee safety.

Recommended Cleaning Equipment

Use a high-quality, soft brush and a squeegee. If it is equipped with a plastic blade and a cloth-covered sponge that is even better. Use a hose with an appropriate nozzle can help in reaching the panels. Ideally, use harvested rainwater for the final rinse to minimise residue, especially if you live in a hard water area.

Cleaning Process

Opt for cleaning on an overcast day, early morning, or late evening to avoid rapid evaporation and subsequent marking. The cooler temperatures of early morning, coupled with dew, can soften dirt and grime. This reduces the water and effort needed for cleaning.

For dry panels, first, use the soft brush to remove any loose dirt. If only hard water is available, ensure thorough squeegeeing to prevent mineral deposit formation on the glass as it dries.

Conclusion

Solar panels in the UK typically require minimal maintenance due to their self-cleaning design. However, certain conditions may need manual cleaning to ensure peak performance.

By adhering to these safety and cleaning guidelines, you can help maintain the efficiency of your solar panels without compromising on safety or system integrity.