The Victron Energy Argo FET Battery Isolator 200-3 is designed to charge three separate battery banks simultaneously from a single alternator or single-output battery charger without directly connecting the batteries together. This allows accessory battery banks to be discharged without also discharging the isolated starter battery.

The ARG200301020 corresponds to the Argo FET 200-3 configuration, which supports a maximum charge current of 200A, a maximum alternator current of 200A, and three battery connections. The manufacturer's specification table confirms M8 bolt connections for this model. 

Key Technology

• Three-Battery Isolation
  Allows three separate battery banks to receive charging current from one alternator or compatible single-output battery charger while maintaining electrical separation between the batteries during discharge.

• 200A Current Capacity
  Rated for a maximum charge current of 200A and a maximum alternator current of 200A for compatible high-current charging systems. 

• Low-Loss FET Technology
  Uses FET-based battery isolation rather than conventional diode isolation, substantially reducing voltage loss between the charging source and connected battery banks.

• Very Low Voltage Drop
  Victron specifies less than 0.02V voltage drop at low current and an average of approximately 0.1V at higher currents. 

• No Alternator Voltage Compensation Normally Required
  Because the FET isolator introduces very little voltage loss, Victron states that there is no need to increase alternator output voltage specifically to compensate for the isolator. 

• Alternator Energize Input
  Includes a special current-limited energize input designed to provide B+ excitation for compatible alternators that require DC voltage at their output before charging begins. 

• Independent Battery Discharge
  The isolated arrangement helps prevent loads connected to one battery bank from simultaneously discharging the starter battery or other isolated battery banks.

• M8 High-Current Connections
  Uses M8 bolt connections for integration into properly designed high-current DC charging systems.

Best Uses

• High-Current Three-Battery Systems
  Suitable for systems where a high-output alternator or compatible charger needs to supply three separate battery banks while maintaining battery isolation.

• Starter & Multiple Auxiliary Batteries
  Ideal for installations with a starter battery and multiple auxiliary or house battery banks supplied by one compatible charging source.

• Marine Battery Systems
  Useful for properly configured onboard electrical systems with multiple independent battery banks that need charging from a common alternator.

• Vehicle & Mobile Power Systems
  Suitable for compatible vehicle installations where high-current alternator charging needs to be distributed among multiple battery banks.

• Single-Output Battery Chargers
  Can distribute charging from a compatible single-output battery charger to three electrically separated battery banks.

• Alternators Requiring B+ Excitation
  The dedicated energize input supports compatible alternators that require DC voltage at B+ before charging can begin.

Product Specifications

Low-Loss Three-Battery Isolation for High-Current Charging Systems

The Victron Energy Argo FET Battery Isolator 200-3 provides an efficient method for distributing charging from a common alternator or compatible single-output battery charger to three independent battery banks. Its low-loss FET architecture, 200A current capability, alternator energize input, and M8 high-current connections make it well suited to properly designed multi-battery DC charging systems.

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