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The Argofet 100-3 Battery Isolator from Victron Energy (100A) – is a high-tech separator based on field-effect FET transistors, which allows simultaneously charging three separate batteries from a single source (whether it's an engine alternator or a mains charger), completely eliminating their electrical shorting to each other.
Unlike outdated diode analogs, the Argofet architecture uses solid-state switches (MOSFET), which guarantees practically zero voltage losses – less than 0.02 V at low current and only about 0.1 V at peak loads.
This technology ensures one hundred percent charging efficiency, eliminating the need to artificially increase the output voltage on the alternator, which is an undeniable advantage over classic diode isolators.
The most important advantages of the Argofet 100-3 isolator
- Synchronous charge supply to 3 batteries while maintaining their full galvanic isolation
- Minimal voltage losses <0.1 V – fundamentally outperforms the parameters of diode separators
- Starter battery protection – a guarantee that the starter battery will not be drained by consumers connected to service batteries
- Special Energize contact – ensures the correct start of the alternator even with an isolator in the circuit
- Modest dimensions – perfectly fits into tight under-hood spaces and compact boat lockers.
- Passive operating principle – the device does not require configuration and periodic maintenance
- Versatility – full-fledged operation in 12 V and 24 V networks
Technical and operational parameters
- Product code: ARG100301020 (R)
- Number of serviced batteries: 3
- Operating on-board network voltage: 12 V / 24 V
- Maximum permissible charge current: 100 A
- Maximum permissible alternator current: 100 A
- Wire mounting method: heavy-duty M8 screw contacts
- Physical dimensions (in mm): 65 x 120 x 200
- Device weight: 1.4 kg
- Voltage losses on the switches: <0.02 V (at low currents), about 0.1 V (at maximum currents)
- Compatibility with alternator excitation output (D+ 61): provided
- Permissible temperature range: meets severe industrial standards
Areas of application
- Vehicles and campers – reliable separation of the starter battery and the living module battery
- Water transport (boats, motorboats, yachts) – decoupling the engine from service consumers (echo sounders, refrigerators)
- Uninterruptible power supply complexes in IT and telecommunications
- Modern systems using LiFePO₄ or AGM batteries that require maximum output
- Charging batteries from solar inverters or diesel generators without significant energy losses
Technological advantages
- Solid-state switching circuit – using modern MOSFETs instead of heating diodes
- Ultra-low heat dissipation – as a direct consequence of the minuscule voltage drop
- Excitation circuit contact – guaranteed to pulse B+, ensuring normal alternator start
- Thoughtful compactness – the case length does not exceed 20 centimeters
- Highest efficiency at all stages of the charging process