Maintaining clean solar panels is crucial for maximising their efficiency, but not all cleaning methods are created equal. A recent study conducted by the University of Turku, Finland, sheds light on how various cleaning products affect the ability of solar panel glass to transmit light effectively. Here's what you need to know about cleaning and maintaining your solar panels safely and efficiently.
Key Findings from the Study
The study explored how different cleaning agents impacted the light-transmitting ability of solar panel glass, which often features anti-reflective coatings. The results are clear:
- Most cleaning agents work well: Glass cleaners and isopropanol were found to be safe and effective for cleaning solar panel glass.
- Dishwashing detergent is a no-go: Surprisingly, dishwashing detergent reduced the glass's ability to transmit light—even more so than leaving the glass dirty. This issue likely arises from detergent residues that rinsing fails to fully remove.
- Chemical cleaning is safe for coatings: Anti-reflective coatings were not damaged by chemical cleaning agents, with dishwashing detergent being the exception.
Professor Kati Miettunen from the research team advises against mechanical cleaning methods, such as pressure washers, which were not tested in the study but could potentially damage the panels.
Why Clean Solar Panels?
Grime, dirt, and debris can block sunlight, reducing a solar panel’s efficiency. While rain often washes panels effectively, extended dry periods can lead to a build-up of dust, pollen, bird droppings, and even lichen. These not only obstruct light but can cause "hard shading," which may result in hotspots that damage the panels over time.
Safe DIY Cleaning Tips
If you're planning to clean your solar panels yourself, keep these tips in mind:
- Avoid Detergents: Stick to products proven to work, like glass cleaners or specialised solar panel cleaning solutions.
- Use Soft Tools: A long-handled, soft-bristled broom can gently remove debris from panels you can reach from the ground.
- Skip the Pressure Washer: Pressure hoses can damage panels. Use a light spray of water instead.
- Check Your Roof's Safety: Working at heights is risky. Use proper safety equipment, such as a harness, and avoid walking on the panels.
If your panels are installed flat or have minimal tilt, ensure they’re cleaned regularly, as rainwater may not drain effectively, leaving muddy streaks.
When to Call in the Professionals
For hard-to-reach panels or heavy soiling, hiring a professional cleaning service is a safer option. Professional cleaners should:
- Use safety gear and avoid standing on the panels.
- Rely on water or mild cleaning solutions.
- Follow your warranty guidelines to prevent voiding it.
Routine Maintenance for Longevity
Cleaning is just one part of maintaining a solar system. Regular servicing by a licensed electrician ensures your system operates efficiently and safely. Here's what to expect during a professional service:
- Visual Inspections: Check for cracks, chips, or discoloration in panels.
- Electrical Testing: Ensure all cabling and connections are in good condition.
- Inverter Maintenance: Inspect for dirt, dust, or blockages that could overheat the inverter.
Servicing should be done every two years, or more frequently if you notice performance issues.
Simple System Checks You Can Do
Between professional services, you can carry out basic checks to keep your system in good shape:
- Inverter Monitoring: Ensure the inverter is running smoothly and free from dirt or vermin. Watch for warning lights or error codes and consult your installer if anything looks unusual.
- Anti-Islanding Test: Some distributors require an annual test to ensure the inverter disconnects from the grid during blackouts, protecting repair crews.
Safety First
Cleaning and servicing solar panels can be dangerous without the right precautions. Always prioritise your safety by avoiding risky DIY cleaning on high roofs or difficult-to-reach panels. For peace of mind, let fully qualified solar professionals handle challenging jobs.
The Takeaway
Keeping your solar panels clean is key to ensuring they operate at peak performance and continue saving you money. With safe cleaning practices and regular maintenance, your solar PV system can provide reliable energy for years to come. Avoid harsh chemicals like dishwashing detergent, keep up with routine checks, and don’t hesitate to call in the experts when needed.
Article information source:
Solar panels should not be cleaned with dishwashing detergent shows new study
How to clean and maintain solar panels
Solar Panel Cleaning Study: Ditch Dishwashing Detergent
