Keeping your solar panels clean is essential for maximizing their efficiency and ensuring they generate the most energy possible. However, not all cleaning methods are safe or effective. A recent study by the University of Turku, Finland, provides valuable insights into the best practices for cleaning solar panels without damaging them. Here’s everything you need to know to maintain your solar panels safely and efficiently.
Key Findings from the Study
The study examined how different cleaning agents affect the light-transmitting ability of solar panel glass, which often has anti-reflective coatings. The results revealed:
- Safe and Effective Cleaning Agents: Glass cleaners and isopropanol are safe and effective for cleaning solar panel glass.
- Avoid Dishwashing Detergent: Dishwashing detergent can reduce the glass’s ability to transmit light—even more than leaving the panels dirty. This is due to residues that rinsing cannot entirely remove.
- Chemical Cleaning is Safe for Coatings: Most chemical cleaning agents do not damage anti-reflective coatings, except for dishwashing detergent.
- Avoid Mechanical Cleaning: It is advised not using mechanical cleaning methods, such as pressure washers, which were not tested but could potentially damage the panels.
Why Clean Solar Panels?
Dirt, dust, pollen, bird droppings, and even lichen can accumulate on solar panels, blocking sunlight and reducing their efficiency. While rain often washes away some debris, extended dry periods can lead to stubborn build-ups. This not only obstructs light but can also cause “hard shading,” which may create hotspots and damage the panels over time.
DIY Solar Panel Cleaning Tips
If your solar panels are easily accessible, you can clean them yourself by following these tips:
- Use Safe Cleaning Agents: Stick to glass cleaners or specialized solar panel cleaning solutions. Avoid dishwashing detergent, as it leaves residues that reduce efficiency.
- Use Soft Tools: Gently remove debris with a long-handled, soft-bristled broom. Avoid abrasive materials that could scratch the panels.
- Rinse with Water: Use a light spray of water to rinse the panels. Avoid pressure washers, as they can damage the panels.
- Stay Safe: Avoid climbing onto the roof. If you must, use proper safety equipment like a harness. Never walk on the panels.
- Clean Flat Panels Regularly: If your panels are installed flat or have minimal tilt, clean them more frequently, as rainwater may not drain effectively, leaving muddy streaks.
When to Hire Professionals
For hard-to-reach panels or heavy soiling, hiring a professional cleaning service is the safest and most effective option. Ensure the professionals:
- Use safety gear and avoid standing on the panels.
- Rely on water or mild cleaning solutions.
- Follow your warranty guidelines to avoid 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 discolouration in the 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.
- Performance Monitoring: Log and monitor any issues to ensure optimal system efficiency.
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 perform 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 prioritize safety by:
- Avoiding risky DIY cleaning on high roofs or hard-to-reach panels.
- Using proper safety equipment if you must work at heights.
- Hiring fully qualified professionals for challenging jobs.
The Takeaway
Keeping your solar panels clean and well-maintained is key to ensuring they operate at peak performance and continue saving you money. By following safe cleaning practices, avoiding harsh chemicals, and scheduling regular professional services, your solar PV system can provide reliable energy for years to come.
