guage For battery cable
What’s a good gauge for battery cable to bridge/parallel 2 coach batteries? There’s 2 guage and 4 guage at pep boys and Walmart Near me
Forum Discussion
Optimistic Paranoid wrote:DrewE wrote:
In theory, the cables between the two batteries only carry half the current that the cables to the inverter would carry (assuming two batteries in parallel) and are short enough that added voltage drop is fairly insignificant.
Well, yes, that's true IF you hook your + and - wires from the inverter up to the SAME battery. Personally, I would hook the + wire to one battery and the - wire to the OTHER battery to keep the load on the two batteries balanced. For that, you want the battery to battery cables to be the same size as the inverter wires.
In that case, it still works out that each interconnect would carry half the current (the half going to or coming from the "other" battery from the connection to the inverter) assuming they are operating in a balanced manner. As I did write, in a fault condition like an open battery, they could have to carry the full current regardless so they should be sized at a minimum to do that safely (without catching fire), but presumably one doesn't care about e.g. voltage drop in a fault condition.
