How to Wire Dual Batteries

There are two methods to wire dual batteries, each having a different purpose. The series method requires wires that link the positive terminal of one battery to the other battery's negative terminal. Wiring dual batteries in series combines the voltage output from each battery. For example, wiring two 12-volt batteries in series increases the voltage to 24. Wiring dual batteries in parallel doesn’t increase the voltage but doubles battery life, assuming both batteries are charged the same. Both methods are simple to complete, so it depends on your intended purpose which method you choose.

Things You'll Need

  • 2 batteries
  • Electrical wire

Instructions

  1. Wire in Series

    • 1

      Check that both batteries have terminals marked “+” and “-“ before you proceed to wire dual batteries.

    • 2

      Connect suitable wire to the negative terminal of one battery. This wire will connect to the unit you want to power. The type of wire depends on the type of battery. For example, if you’re wiring a car, the batteries should use car battery cable with the appropriate clips. If they are small, low-voltage batteries, then regular electrical wire is fine.

    • 3

      Connect another wire to the positive terminal of the same battery. Connect the other end to the negative terminal of the second battery.

    • 4

      Connect a third wire to the positive terminal of the second battery.

    • 5

      Connect the two loose wires to your power unit, ensuring you connect the batteries and power unit negative to negative and positive to positive. Your dual batteries are wired in series.

    Wire in Parallel

    • 6

      Choose the type of wire you want to use to wire the dual batteries. For example, if you’re wiring car batteries, you should use car battery cable with the appropriate clips. If they are small, low-voltage batteries, then regular electrical wire is fine.

    • 7

      Check the battery terminals clearly indicate whether they are positive or negative. Connect two wires to the negative terminal of the first battery and two wires to the positive terminal of the first battery. One wire from each terminal will connect to the unit you want to power.

    • 8

      Connect one of the wires from the negative terminal on your first battery to the negative terminal of your second battery.

    • 9

      Connect one of the wires attached to the positive terminal of your first battery to the positive terminal of your second battery.

    • 10

      Connect the loose negative wire from your first battery to the negative terminal of the unit you want to power. Connect the loose positive wire from the first battery to the positive terminal of the unit. You have wired dual batteries in parallel.

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References

  • Photo Credit battery image by Edsweb from Fotolia.com

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