The Victron Energy Argofet 200-2 Battery Isolator is a FET-based device for charging two 12V or 24V batteries from one alternator or single-output battery charger without connecting the batteries together. Rated for 200A maximum charge and alternator current, it helps prevent an accessory battery from discharging the starter battery.
Its low-loss FET technology keeps voltage drop below 0.02V at low current and around 0.1V at higher current. A current-limited alternator energize input supports alternators that require B+ voltage to begin charging, making it a reliable solution for high-current dual-battery systems.