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There is electricity between the negative pole of the photovoltaic panel and the frame
Polarity essentially means that the generator has positive charges on one side and negative charges on the other. You need a voltmeter or multimeter if you want to check the polarity .
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Which end of the photovoltaic panel is the positive pole
Generally, the leading wire of the left box corresponds to the negative pole, and the right side corresponds to the positive pole, but this depends on whether the module is placed vertically or horizontally, so you must look for the laser-engraved marking next to the cable gland.