Victron Energy Argofet 100-3 Three Battery 100A Battery Isolator ARG100301020R

The Victron Energy Argo FET Battery Isolator 100-3 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 independently without also discharging the isolated starter battery.

The ARG100301020R corresponds to the Argo FET 100-3 configuration, which is rated for a maximum charge current of 100A, a maximum alternator current of 100A, and connection to three battery banks. Its FET-based architecture provides extremely low voltage loss compared with conventional diode battery isolators.

Key Technology

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

• 100A Current Capacity
  Rated for a maximum charge current of 100A and a maximum alternator current of 100A. 

• 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.

• 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 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 to supply B+ excitation for compatible alternators that require DC voltage at their output before charging begins. 

• Independent Battery Discharge
  Battery-bank separation helps prevent loads connected to an accessory battery from simultaneously discharging the starter battery or other isolated battery banks.

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

Best Uses

• Three-Battery Charging Systems
  Ideal for systems where a common charging source needs to charge three separate battery banks while maintaining electrical separation between them.

• Starter & Auxiliary Battery Systems
  Suitable for installations with a starter battery and multiple auxiliary or house battery banks supplied by one compatible charging source.

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

• Vehicle & Mobile Power Systems
  Suitable for properly configured vehicle electrical systems where separate battery banks support different electrical loads.

• Single-Output Battery Chargers
  Can distribute charging from a compatible single-output battery charger to multiple isolated battery banks.

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

Product Specifications

Low-Loss Three-Battery Isolation for 100A Charging Systems

The Victron Energy Argo FET Battery Isolator 100-3 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, 100A current capability, alternator energize input, and robust M8 connections make it a practical solution for properly designed multi-battery DC charging systems.

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