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Solar panels need to be cleaned from time to time to get rid of anything that might be hindering the supply of adequate sunlight to the area. It is usually caused by dirt buildup, which can eventually affect the efficiency of the power source.
If your solar inverter isn’t as efficient or doesn’t last as long as it used to, it may be because it needs cleaning. There is no specific time to clean them, but your location and climate may determine the frequency.