What Size Cable To Run For Dual Battery

I always suggest a minimum yes i did say a minimum of 6 b s 13 5mm cable for linking batteries larger is even better any further improvements to the charging time and system as a whole will be gained by increasing the size of this cable i know that the larger cable is not cheap but bigger is always best in the long run. For more detail though check with the national electrical code as well as your own zoning laws. Below we reference the two things you must double check when sizing your battery cables.

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Basic Dual Battery System

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Copper conductor ampacity based on 75 c 167 f reference.

What size cable to run for dual battery.

It ensures you have power stay on task and avoid battery drain. As far as i know these values are valid as of today. But to enable this you need to make sure the sizing is correct. Cable size ampacity chart.

The following maximum amps versus cable size awg come from the nec version 2011. The century n70t deep cycle battery is rated at 100 amps. Calculate the right 4x4 dual battery setup with redarc s calculators that will help you work out the numbers your vehicle need. If in doubt always opt for the larger size cable.

Regardless of the math we would never use 7 71mm battery cable in a dual battery system. The battery cable is among the most important cables in a battery management system. In summary when selecting the correct size of battery cable you need to take into account the total maximum amperage your electrical system requires the voltage of your system usually 12 volts the total length that your cables need to be and the amount of voltage drop you are willing to accept versus the amount you want to spend. Use 13 5mm as an absolute minimum.

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