Car Battery Cable Size Calculator

Too small a cable size and you ll run the risk of generating heat in the cable.

Car battery cable size calculator.

Choosing the correct gauge automotive wire depends on the acceptable voltage drop length of the feeder branch circuit conductor load amperage and the ambient temperature of the compartment where the primary wire will pass through. Think of this as the minimum battery bank size based on your typical usage. Cable size ampacity chart. The rating of the battery reduces by approximately 62 if it is discharged in 1 hour.

For example if the same 20 ah battery is discharged in one hour it can only deliver 12 4 a for one hour which amounts to 12 4 ah. Choose a higher ambient temperature when conductors are expected to pass through. Outside engine compartments the ambient temperature should generally be 20 c. Too large and you ll be wasting money on copper you don t need.

You may want to consider 600 800 amp hours of capacity based on this example depending on your budget and other factors. Our battery cable is american made and comes in gauge awg sizes of 6 4 2 1 1 0 2 0 3 0 and 4 0 with 6 gauge being the smallest and 4 0 gauge being the largest. Average run cycle is 10 hours. So all interconnecting cables are 2 0 based on the chart below.

Battery cable is used to power your electrical system and is sized according to the american wire gauge or awg for short specification for electrically conductive cables. Cable sizing selection. However when the 2 105 20 hrs batteries in parallel are used and then put on charge after use the batteries typically register 50 charged. Automotive wire size calculator this is a simple calculator for determining approximate wire gage size based on the length of the wire in feet and the current in amps in general automotive applications.

One of the most important aspects of designing and building any part of a vehicle electrical system is determining the correct size and type of cable to use for each circuit. Actually for my current installation i ve sized all of my dc cables to meet the 175 amp worst case scenario. The following maximum amps versus cable size awg come from the nec version 2011. Battery banks are typically wired for either 12 volts 24 volts or 48 volts depending on the size of the system.

The battery size calculator derates the battery linearly based in this characteristic. As far as i know these values are valid as of today.