6/9/2023 0 Comments Wire ampacity chart![]() This is actual wiring distance, up pole mounts, around obstacles, etc. (This is not usually a problem in low-voltage circuits).Įxample: Your PV array consisting of four 75W modules is 60 feet from your 12-volt battery. Be sure that your circuit amperage does not exceed the figure in the Ampacity column for that wire size.Take the VDI number you just calculated and find the nearest number in the VDI column, then read to the left for AWG wire gauge size. ![]() ![]() Determine the appropriate wire size from the chart below. % Volt Drop = Percentage of voltage drop acceptable for this circuit (typically 2% to 5%)Ģ.VDI = AMPS x FEET ÷ (% VOLT DROP x VOLTAGE) Calculate the Voltage Drop Index (VDI) using the following formula: Note: This formula doesn’t directly yield a wire gauge size, but rather a “VDI” number, which is then compared to the nearest number in the VDI column, and then read across to the wire gauge size column.ġ. There’s no sense using your expensive PV wattage to heat wires. For most DC circuits, particularly between the PV modules and the batteries, we try to keep the voltage drop to 3% or less. This chart is useful for finding the correct wire size for any voltage, length, or amperage flow in any AC or DC circuit.
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