Originally Posted by k1vsk
Yes, but in all fairness and in the spirit of full disclosure, the above scenario can be eliminated by simply removing the battery switch such that you have dedicated, separate start and house banks. In point of fact, the switch is completely unnecessary and only serves to create problems which is what i think the writer of the above is trying to say.
Very, very true but the majority of boats I have been on with ACR's still have a 1/2/All/Off switch...
Actually though in that scenario the battery switch had or has nothing to do with the depletion of the start battery. It is the fault of a short run time for recharge but a long enough run time to equalize the banks through the ACR and large gauge cables....
The same thing could happen with or without the star battery being wired directly as the ACR still combines a dead bank with a fully charged start battery the minute it sense 13+ volts. If you shut the engine down soon after for an emergency repair you could still have depleted a lot of the capacity of the reserve battery especially with AGM's. With wets acceptance limits this scenario.