Used to upgrade boat to dual batteries. Have peace of mind that batteries are isolated and there is no need to remember what position switch is in just turn battery switches to on and go. This switch automatically transfers charging to house battery when start battery is fully charged no more need to remember if battery one or battery two is start battery or trying to figure out which one is the sense battery and which one is back up battery. This switch dedicates Start, House, and emergency parallel.
(5 of 5 people found this review helpful)