Quote Originally Posted by MLA View Post
I just want to clarify something in regards to the operation of the ACR. The Blue Sea 7610 ACR does not sense which battery needs charging and distribute to one or the other based on each batteries voltage per say. When the switch is in the on position, terminal A of the ACR is connected to the main cranking bank, and terminal B of the ACR is connected to the house battery bank. The main alternator cable is also connected to the main cranking bank. When voltage is high, indicating the alternator is charging, the relay closes and combines the two battery banks. Now both batteries are receiving a charge from the alternator. When the voltage is low, indicating a heavy load on on terminal B or the engine is off, the relay opens and isolates the main cranking battery from the house bank. This prevent any load drawing on the house bank from drawing on the main cranking.
Thats interesting.

In theory this means if you stop and party cove it, drain the 2nd battery playing your tunes. Then you start your boat up and the ACR senses voltage and charged the starting battery, it would combine both batteries to charge.

This would then actually drain your starting battery because they would all equalize.

If you then stoped to party cove it again and drained your stereo battery dead.

Restarted the boat you would essentiually equalize again and possible kill both batteries.

I cant recall what kind was in my boat but it would sense voltage and switch to the stereo bank, at no point would it add both banks as 1 unit. It was eighter charging the house battery or my stereo batteries.

Only when i switched it to Combine or hit opened the 2 circuit breakers did it combine all the batteries.