Do you think the common size of photovoltaic wires is only "MM"? Wrong, there are actually "AWG" or "American Wire Gauge". For experienced engineers in the industry, if the AWG size value of the photovoltaic cable is smaller, it means that the cross-sectional area of the photovoltaic cable is smaller, so it has a lower voltage drop. Solar panel manufacturers will show you the dimensions of photovoltaic cables meaning and calculation companies and more.
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