The formula P=E*I says that the wattage/power P is equal to the voltage E times the current I in a circuit. Simply stated, the higher the voltage, the smaller the wire size that is needed to carry the current. The main issue is the wire size needed for the (usually) fairly long run to the Solar Panels. Step 1 - The first step is to decide on the voltage for your system: 12, 24, or 48 volts. ( 3% - 5% typical )ĭetailed Instructions for using the Wire Size Calculator
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