Victron Energy Argofet 100-3 Three Battery 100A Battery Isolator ARG100301020

The Victron Energy Argo FET Battery Isolator 100-3 is designed to charge up to three separate battery banks simultaneously from a single alternator or single-output battery charger without directly connecting the batteries together. This allows an accessory battery bank to be discharged without also discharging the isolated starter battery.

The ARG100301020 corresponds to the Argo FET 100-3 configuration, rated for a maximum charge current of 100A and a maximum alternator current of 100A with three battery outputs. 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 maintaining electrical separation between the batteries.

• 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 instead of conventional diode isolation, significantly reducing the voltage loss between the charging source and connected battery banks.

• Extremely Low Voltage Drop
  Victron specifies a voltage drop of less than 0.02V 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
  Features a special current-limited energize input that can supply 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 unintentionally discharging the other connected 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 isolation 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 to receive charging current from a common alternator.

• Vehicle & Mobile Power Systems
  Suitable for properly designed vehicle installations where multiple battery banks serve 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 B+ 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 solution for distributing charging from a common alternator or compatible single-output 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 choice for properly designed multi-battery DC charging systems.

Why Buy From US Solar Supplier

US Solar Supplier is an American-founded company based in Kentucky dedicated to offering top-quality solar components from trusted manufacturers. We provide competitive pricing, dependable inventory, and products backed by warranties you can trust.

Our inventory is updated daily with the latest solar technologies, and our experienced team is ready to assist with product selection, system design, and installation guidance.

Need Assistance?

Have questions before you order? Call 1-800-230-7004 to speak with our knowledgeable support team. We’re here to help with product details, compatibility questions, or purchasing support.