Victron Argo FET 200A 3-Battery Isolator

The Victron Argo FET 200-3 charges three batteries from one alternator or charger using field-effect transistors, with under 0.1V drop.

Voltage drop is where FET isolation beats diode isolation, and Victron quotes the figures rather than a claim. Less than 0.02V at low current and around 0.1V at higher current, against roughly 0.6 to 0.7V for a diode isolator. That difference decides whether the banks reach a full charge or sit permanently short.

An undercharged lead-acid bank sulfates and loses capacity permanently, so the drop is not merely inefficient. It is the mechanism by which a boat with a diode isolator quietly wears out its batteries early.

Two hundred amps across three outputs suits a substantial charging system. The separation means the three banks charge together without being connected to each other, so loads on one cannot drain the others. Explore more battery isolators and charging relays.

• Under 0.02V at low current, around 0.1V at high
• A diode isolator drops 0.6 to 0.7V
• An undercharged bank sulfates permanently
• 200A across three isolated outputs