ProMariner Battery Isolator - 130 AMP - 1 Alternator - 3 Battery 
Argo FET Battery Isolator 200-3 3 Batteries – 200AMP
Similarly to diode battery isolators, FET isolators allow simultaneous charging of two or more batteries from one alternator (or a single output battery charger), without connecting the batteries together. In contrast with diode battery isolators, FET isolators have virtually no voltage loss. Voltage drop is less than 0,02 Volt at low current and averages 0,1 Volt at higher currents.
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