A boat’s batteries typically spend less than 2% of their time being charged by the alternator. For the remaining 98% of the time they are being maintained by the AC battery charger. During this time, it is important that the proper charging stage of Bulk, Absorption, PreFloat, or Float be applied to each battery.
When engine is running and alternator is charging batteries, ACRs combine batteries, providing charge to each battery from the engine.
AT THE DOCK
When P12 Battery Charger is operating, communication with ACRs isolates batteries so the proper charge is applied to each battery.