Guest 12V 30A 3-Bank On-Board Charger

The Guest 30A On-Board Battery Charger handles three 12V banks, each with dedicated charging, sensing and control, in a fully sealed housing.

Thirty amps across three banks is the largest Guest on-board charger, sitting above the 10A single, 10A two-bank and 40A four-bank models in the range. High-frequency digital charging is what keeps it considerably lighter than the transformer-based chargers it replaces, which matters on something mounted inside a locker.

Each bank gets its own circuit rather than being treated as one combined load, so a tired battery does not drag the healthy ones down through a shared charge. A fully automatic five-stage program handles recovery through to maintenance without any mode switching by the user.

The expanded LED display shows each bank separately, and wiring and battery fault detection flags connection problems during setup and operation rather than leaving them to be traced later. Auto-maintain Energy Saver logic cuts unnecessary charging once the batteries have recovered, so the charger can stay connected between trips. Sealed against fresh and salt water, pre-wired, two-year warranty. Explore more on-board battery chargers.

• 30A, the largest Guest on-board charger
• High-frequency digital, far lighter than transformer units
• Each bank charged independently, not as one load
• Five-stage automatic charging with fault detection