I think I'm going to locate my new Iota on the ceiling of the pass through. It's a lot cheaper and easier to throw in a new 15amp c/b and run 120vac up front with some Romex than it is to replace all the battery cable with 2 or 4 ga. With the charger up front I can just run short cables directly to the batteries, and leave the original battery cables in place to feed power to the DC distribution panel. The current flow on that portion of the wiring will not change.
If I'm overlooking something stupid somebody set me straight.