Victron Argofet 100-3 100A FET Battery Isolator for 3 Batteries

Victron Argofet 100-3 Three batteries 100A

Similar to diode isolators, FET isolators allow simultaneous charging of two or more batteries by a generator or by a charger connection without connecting the batteries to each other. A discharge of the service battery does not lead to a simultaneous discharge of the starter battery.

Unlike diode isolators, FET isolators have virtually no voltage loss. The voltage drop is less than 0.02 volts at low currents and only 0.1 volt at higher currents.

With ARGO FET battery isolation, no voltage increase is necessary. However, short cable lengths and sufficient cross-sections should be ensured.

An example:
A 100 A current has a voltage loss of 0.26 volts with a cable length of 10 m and a 50 mm2 cable cross-section. With 5 m cable and 10 mm2, a 50 A current causes a voltage loss of 0.35 volts!

Alternator starter excitation
Some alternator types require a DC voltage at the B+ terminal for starter excitation. On the one hand, there is a direct cable connection due to the connection between the battery and the alternator. On the other hand, the isolator prevents current feedback, so the alternator does not start. The new Argofet battery isolator has a special current-limited connection for starter excitation when the alternator is started.

Documents & Downloads

• Datasheet Victron Argofet