ProMariner ProIsoCharge 120 P/N 23121The ProMariner ProIsoCharge lets mariners charge up to 2 different battery banks off of one alternator while at the same time protecting your engine batteries. You can save space because there is no need to have multiple voltage sensitive relays to charge multiple battery banks because of it's all-in-one design. When you have one battery bank that is under a load this unit will take the fully charged batteries off line. You will also be able to enjoy the full benefit of shore power and on the water charging.This ProIsoCharge 120 unit is configured for the following: