The Victron Energy Argo FET Battery Isolator 200-2 is designed to charge two separate battery banks simultaneously from a single alternator or single-output battery charger without directly connecting the batteries together. This keeps the battery banks separated during discharge, helping prevent accessory loads from also discharging the starter battery. 

The ARG200201020 corresponds to the Argo FET 200-2 configuration, which supports a maximum charge current of 200A, a maximum alternator current of 200A, and two battery outputs. Its FET-based architecture provides very low voltage loss compared with conventional diode battery isolators.

Key Technology

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

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

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

• Extremely 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 of the very low voltage loss through the FET isolator, Victron states that alternator output voltage does not need to be increased specifically to compensate for isolator losses. 

• Alternator Energize Input
  Includes a special current-limited energize input designed for compatible alternators that require DC voltage at the B+ output before charging can begin.

• Independent Battery Discharge
  The isolated battery arrangement helps prevent loads connected to an accessory battery from simultaneously discharging the starter battery.

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

Best Uses

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

• Starter & Auxiliary Battery Systems
  Ideal for installations where a starter battery and a separate auxiliary or house battery share a common charging source.

• Marine Battery Systems
  Useful for properly configured onboard electrical systems with separate starting and auxiliary battery banks supplied from one alternator.

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

• Single-Output Battery Chargers
  Can distribute charging from a compatible single-output battery charger to two isolated 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 Two-Battery Isolation for High-Current Charging Systems

The Victron Energy Argo FET Battery Isolator 200-2 provides an efficient method for distributing charging from a common alternator or compatible single-output battery charger to two independent battery banks. Its low-loss FET architecture, 200A current capability, alternator energize input, and robust M8 connections make it a practical solution for properly designed high-current multi-battery DC charging systems.

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