Wuhl right. But to run a BCDC just for an aux batt so close to the main batt really is overkill.There are cheaper ways to do most of the same things.
Correct. I'm running a BCDC.@LandLocked93 The BCDC doesn’t require large gauge wire since it does not parallel combine your batteries like a VSR or similar type setup. This in itself makes the install a s*** ton easier. It charges an aux battery by pulling power from your start battery. This means it can charge at specific voltages and the 2 batteries can be different chemistries, among other pros and cons.
As an aside, as Ronny Dahl posits, "Are you really running a dual battery setup if ... ?"