Victron battery separator Argofet 200-2

As with Argodiode bridges, Argofet bridges such as the Victron Argofet 200-2 Battery Separator allow two or more batteries to be charged simultaneously from a single alternator (or from a single charger) without connecting the batteries together; for example, discharging the service battery does not discharge the starter battery, and vice versa.

Compared to diode bridges, FET bridges have the advantage of virtually zero voltage loss: The voltage drop is less than 0.02 V at low currents and averages 0.1 V at higher currents.

When using Argofet diode bridges, it is not necessary to increase the output voltage of the alternator as well. However, it is strongly recommended that the cables are short and of a suitable cross-section.

Example:
When a current of 100 A flows through a cable of 50 mm2 cross-section (AWG 0) and 10 m length (30 ft), the voltage drop in the cable will be 0.26 volts. Similarly, a current of 50 A through a cable of 10 mm2 cross-section (AWG 7) and 5 m length (15 ft) will result in a voltage drop of 0.35 volts.

Alternator power input

Some alternators require a DC voltage at the B+ output to start charging. Obviously, DC will be present when the alternator is connected directly to the battery. However, if a diode bridge or FET separator is inserted, any voltage/current return from the batteries to the B+ output will be prevented, and the alternator will not be activated.
The new Argofet diode bridges have a special energised input with current limiter that will feed the B+ output when the motor start/stop switch is closed.

Datasheet Victron Battery Separator Argofet 200-2 - ARG200201020

See data sheet for Victron Battery Separator Argofet 200-2 - ARG200201020