How to Increase Cold Cranking Amps of Two 12 Volt Batteries

Updated 08/20/2018 | Published 08/18/2018

Question:

If I want help starting a generator on s camping trailer which way is better to hook up 2 12v batteries

asked by: Les

Expert Reply:

In order to achieve maximum cranking amps you will want to wire your two 12 volt batteries in parallel (see photo). The output of 12 volts will remain the same but the capacity and cranking amps will become the sum of the two batteries. For example, if battery A has a 600 cold cranking amp (CCA) rating and battery B has a 600 cold cranking amp (CCA) rating then the batteries wired in parallel will produce 1,200 cold cranking amps (CCA).

expert reply by: Conner L