Once a turbine is going, it can take hours to slow back down, and that could explain why they are turning without wind. They could also be drawing power from the grid to rotate the blades during cold periods of the year to prevent the blades and gears freezing up.
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Before cleaning your solar panels, always turn off the solar power system to avoid the risk of electric shock. If you need to clean the roof, use safety equipment such as a safety harness and ropes to prevent falls.
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Verify the meter and battery settings. Turn the P /1/0 switch to OFF (0) and wait at least five minutes for the capacitors to discharge.
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The most common reason for yellow solar panels is because of a chemical reaction causing acetic acid to form. In extremely cheap budget panels, certain chemicals used to clean the panels' glass, even in manufacturing, react with the chemicals in the cells.
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