Victron Argofet 200-3 200A FET Battery Isolator for 3 Batteries

Victron Argofet 200-3 Three batteries 200A

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

In contrast to diode isolators, there is practically no voltage loss with FET isolators. The voltage drop is less than 0.02 volts at low currents and only 0.1 volts at higher currents.

With ARGO FET battery isolation, no voltage boost is required. 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 of cable and 10 mm2, a 50 A current causes a voltage loss of 0.35 volts!

Alternator start-up excitation
Some types of alternators require a DC voltage at the B+ terminal for start-up 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, however, the isolation diode prevents current feedback, so that the alternator does not start. The new Argofet battery isolator has a special current-limited connection for the start-up excitation when the alternator is started.

Documents & Downloads

• Datasheet Victron Argofet