Victron Argo FET 200A 2-Battery Isolator

The Victron Argo FET 200A 2-Battery Isolator charges two banks from one alternator or charger, dropping under 0.1V.

Two hundred amps across two outputs suits a high-output alternator or a large single-output charger. The isolator rating should exceed what the charging source produces rather than matching it, since an isolator running at its limit heats and the resistance costs voltage.

FET isolation addresses the main weakness of diode isolators: voltage loss. Less than 0.02V at low current and around 0.1V at higher current, against 0.6 to 0.7V for a conventional diode unit. That difference decides whether the banks reach full charge.

Keeping the banks independent means house loads cannot draw down the starting battery. Both still charge from one source, which is the arrangement most boats need without the compromise a shared connection brings. Explore more battery isolators and charging relays.

• 200A for a high-output alternator or large charger
• The rating should exceed the source, not match it
• Under 0.02V low, around 0.1V high
• A diode isolator drops 0.6 to 0.7V