Victron Energy Argo FET Battery Isolator 200 amps 2 Batteries Blue. In contrast with diode battery isolators FET isolators have virtually no voltage loss. Voltage drop is less than 002 Volt at low current and averages 01 Volt at higher currents. Specifications for Victron Energy Argo FET Battery Isolator - 2 Batteries: Manufacturer: Victron Energy Color: Blue Package Contents: Victron Energy Argo FET Battery Isolator - 2 Batteries Victron Energy ARG200201020R: Argo FET Battery Isolator 200 amps 2 Batteries Blue