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 the accessory battery to be discharged independently without also discharging the starter battery.

The ARG100201020 supports a maximum charge current of 100A and a maximum alternator current of 100A. Unlike conventional diode isolators, the Argo FET design provides virtually no voltage loss, with less than 0.02V drop at low current and an average of approximately 0.1V at higher currents. 

Key Technology

• Two-Battery Isolation
  Allows two battery banks to receive charging current from a common 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 instead of conventional diode isolation, significantly reducing the voltage loss between the charging source and connected battery banks.

• Very Low Voltage Drop
  Voltage drop is specified at less than 0.02V at low current and averages approximately 0.1V at higher currents. 

• No Alternator Voltage Compensation Normally Required
  Because of the very low voltage loss across the FET isolator, Victron states that there is no need to increase the alternator's output voltage to compensate for isolator losses. 

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

• Independent Battery Discharge
  Keeping the battery banks isolated helps prevent accessory loads from unintentionally discharging the starter battery.

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

Best Uses

• Starter & Auxiliary Battery Systems
  Ideal for systems where a single alternator needs to charge a starter battery and a separate auxiliary battery while maintaining battery-bank isolation.

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

• 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 makes the isolator suitable for compatible alternators that require voltage at B+ to initiate charging.

Product Specifications

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

The Victron Energy Argo FET Battery Isolator 100-2 provides a highly efficient solution for charging two independent battery banks from a common alternator or compatible single-output charger. Its low-loss FET architecture, 100A current capability, alternator energize input, and robust electrical connections make it a practical choice for properly designed multi-battery DC charging systems.

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