The Victron Energy Argo FET Battery Isolator 100-2 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 allows an accessory battery to be discharged independently without also discharging the starter battery.

The ARG100201020R corresponds to the Argo FET 100-2 configuration, which supports a maximum charge current of 100A, a maximum alternator current of 100A, and two battery outputs. Its FET-based design provides extremely 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 keeping the batteries isolated from one another 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 to significantly reduce 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
  The low-loss FET design eliminates the need to increase alternator output voltage specifically to compensate for the isolator's voltage drop.

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

• Independent Battery Discharge
  Battery-bank separation helps prevent accessory loads from unintentionally discharging the starter battery.

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

Best Uses

• Starter & Auxiliary Battery Systems
  Ideal for systems where one alternator needs to charge a starter battery and a separate auxiliary battery while maintaining isolation between the battery banks.

• Vehicle Dual-Battery Systems
  Suitable for compatible automotive and mobile electrical systems where accessory loads should remain separated from the starter battery.

• Marine Battery Systems
  Useful for properly configured onboard electrical systems with separate starting and auxiliary battery banks supplied by a common charging source.

• RV & Mobile Power Systems
  Suitable for installations requiring simultaneous charging of starter and house battery banks without directly paralleling the batteries.

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

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

Product Specifications

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

The Victron Energy Argo FET Battery Isolator 100-2 provides an efficient method of charging two independent battery banks from a common alternator or compatible single-output battery charger. 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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