Battery Cable Gauge
 

I am going to add 2 Group 27 batteries to my battery Bank. What size cable is ok to run between batteries and the switch. Pretty short runs. No longer than 30". I have a bunch of 4 gauge laying around but I feel like I need to use at least 2 gauge.

Whats the anticipated current draw going to be?

Man thats a great question. I don't know exactly. Whatever the starter pulls will probably be the highest.

1/0 ga