Quick Answer
Cleaning solar panels with high-pressure washes can damage the panels, and using household cleaners can leave streaks and residue that reduce efficiency.
Avoiding High-Pressure Washes
High-pressure washes can damage the solar panels’ surface, creating micro-scratches that reduce their efficiency. It’s recommended to use a low-pressure wash with a wide fan tip, set to 1-2 gallons per minute. A pressure setting of 1,000-1,500 pounds per square inch (PSI) is considered safe for most solar panels.
Choosing the Right Cleaning Solution
Avoid using household cleaners, which can leave streaks and residue on the solar panels. Instead, use a mixture of water and a mild dish soap, specifically designed for cleaning solar panels. A 1:10 ratio of dish soap to water is a good starting point. For more stubborn dirt or debris, add a small amount of white vinegar to the solution.
Drying the Panels
After cleaning the solar panels, use a soft, dry cloth to remove excess water and prevent water spots. Gently pat the panels dry, working from the top down to prevent water from running down to the bottom. If possible, use a solar panel drying rack or a drying aid to speed up the drying process and prevent water spots.
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