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The Victron Argodiode 80-2SC is a diode-based battery isolator that lets one alternator charge two battery banks at once without linking them directly. Schottky diodes keep the voltage drop low, around 0.3 V at low current and about 0.45 V at the full 80 A rating, and a compensation diode input helps offset that drop. It suits boats, RVs and vehicles where the starter battery must stay protected while an auxiliary bank charges. Against relay or DC-DC alternatives it is simple and silent with no moving parts, but the inherent diode drop means some setups may not reach a full charge without compensation.
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Lowest price we've seen: $39.10 on Nov 12 at Blue Marine. Tracked across 14 stores since Nov 12.
The Victron Argodiode Battery Isolator 80-2SC charges two batteries from a single alternator without connecting them directly to each other. It keeps the battery banks separate, which prevents cross-charging and preserves the starter battery's power. This suits boats, RVs and vehicles where the engine must stay ready to start while an auxiliary battery charges.
It uses Schottky diodes for low voltage drop. The drop is about 0.3 V at low current and about 0.45 V at the rated output. A compensation diode slightly raises the alternator output to offset the diode drop. A current-limited energize input powers B+ when the engine run/stop switch is closed, which addresses alternator startup behavior.
The isolator is installed between the alternator and the batteries. In some setups this can slightly reduce the charge voltage, which may prevent a full 100% charge. Consult a Victron dealer for compatibility and configuration.
