9/18/2023 0 Comments Wire gauge amp chart 12 volt dcWire SizeĬhart developed by John Davey and Windy Dankoff. What if this system was 24-volt? The modules would be wired in series so each pair of modules would produce 4.4 amps. Looking at our chart, a VDI of 29 means we’d better use #2 wire in copper, or #0 wire in aluminum. These modules are rated at 4.4 amps x 4 modules = 17.6 amps maximum. If you’re planning a circuit with 6 AWG wire size, it can safely carry 80 amps outside the engine room, but only 46. ABYC standards assume the temperature is 122☏ (50☌). This is actual wiring distance, up pole mounts, around obstacles, etc. Something about 12-volt DC power seduces and encourages hack electricians to try their hand using household-grade wire and terminals. (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. Step 1 Calculate the following: VDI (AMPS x FEET)/ (VOLT DROP x VOLTAGE) VDI Voltage Drop Index (a reference number based on resistance of wire) FEET ONE-WAY wiring distance (1 meter 3.28 feet) VOLT DROP Your choice of acceptable voltage drop (example: use 3 for 3) Step 2 Determine appropriate wire size from the chart below.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: Most electrical products include a rating label, or you can find the amperage rating in the documentation that came with the product. Choosing the correct wire A Locate the CURRENT IN AMPS of your appliance across the top of the chart. 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. If you want to accurately work out what size wire you require, you need to know the maximum amount of amps that will flow through your circuit. To use the chart included with this technical brief, follow the instructions below. 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. 14-gauge are usedfor light fixtures, lamps, lighting circuits with 15 amps 12-gauge are used in kitchen, bathroom, outdoor receptacles, and 120-volt air.
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