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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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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This can be caused by UV light from the sun, exposure to chemicals, or oxidation from the oxygen in the air.
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