4 Gauge 4 AWG 25 Feet Red + 25 Feet Black ( 50 Feet Total ) Welding Battery Pure Copper Flexible Cable Wire -- Car, Inverter, RV, Solar by WindyNation

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Hi Ben, if that is a 12V battery, we first need to calculate the amp draw like this: 3000W / 12V = 250 Amps.

American wire gauge - Wikipedia

You can consult the wire ampacity chart from the 1st Chapter and see that the most appropriate wire size for 80 amps is 4 AWG wire. Here is an example of one such wire: 17 AWG wire is used for its tensile strength; not as an electric wire. Different AWG (American Wire Gauge) wires have different diameters, cross-sections, and allow only a limited number of amps to flow through them. You can consult the wire ampacity chart from the 1st Chapter and see that the most appropriate wire size for 10 amps is 20 AWG wire.You can consult the wire ampacity chart from the 1st Chapter and see that the most appropriate wire size for 20 amps is 14 AWG wire. While circuit breakers or wiring fuses offer good protection against overloading wires and overheating them, they are not absolute protection.

Cross Reference AWG to MM2 | Multi/Cable Corporation Cross Reference AWG to MM2 | Multi/Cable Corporation

Alright, you need a wire that can handle a little bit more than 250 amps (to account for small voltage drop due to 15 feet cable length). If you’re trying to figure out what size AWG cable to use for an automotive wiring job, use this Cable Size Calculator.

I have a 12 v “cooler” for my Jeep it has a 12 v sump pump pumping water thru a small radiator with a 12 v 120 watt radiator fan.

American Wire Gauge (AWG) Cable Conductor Size Chart / Table American Wire Gauge (AWG) Cable Conductor Size Chart / Table

The number of devices connected to the circuit usually determines how much current will flow through the wire. Here is how this tensile 19 gauge galvanized steel wire looks like: 19 gauge galvanized steel wire used for its tensile properties. I think it is an important distinction so that people understand that the wire be adequately sized for continuous rating and that they cannot opt for the cheaper 14 awg wire in this situation. In this AWG wire gauge chart for a standard copper wire, you can find every AWG wire; from the biggest 10+ mm wires (such as 4/0 AWG and 3/0 AWG wires) to the smallest below 0.You can consult the wire ampacity chart from the 1st Chapter and see that the most appropriate wire size for 50 amps is 8 AWG wire. volts (2%) is best for large cables like battery cables 4AWG (25 ISO) or larger, carrying large currents. The higher the amperage rating of the circuit, the larger the electrical wires need to be to avoid excess heat that can melt wires and cause fires. If you don’t pick a wire that is thick enough (has sufficient ampacity), the whole circuit might catch fire.