Guest 6A/12V 1 Bank 120V Input On-Board Battery Charger

The Guest 6A/12V 1 Bank 120V Input On-Board Battery Charger (Model 28106) is a microprocessor-controlled charging system engineered for boats, RVs, and marine vessels that demand reliable 12-volt battery maintenance. This single-bank charger accepts 120-volt shore power input and automatically manages the charging cycle for both flooded and AGM batteries—the two most common battery types found on recreational vessels and offshore fishing boats.

At 6 amps output, this charger delivers moderate charging speed suitable for maintaining and restoring 12-volt battery banks without the risk of overcharging or thermal stress. The microprocessor controller monitors charge state continuously, transitioning through absorption and float phases to maximize battery lifespan. Isolated outputs prevent backfeed to other onboard circuits, a critical safety feature when managing multiple electrical systems. The 120-volt input works directly from standard dock power, eliminating the need for manual switching or external conversion equipment—a practical advantage for weekend anglers and liveaboard cruisers who move between marinas with different power configurations.

This charger addresses a fundamental requirement for any serious boater: keeping batteries healthy during layups and between trips. Whether maintaining batteries on a center console, sportfish, or cruising yacht, the Guest 6A charger fits the operational rhythm of vessels that operate seasonally or spend significant time at dock. Intuitive operation means minimal configuration—connect, plug in, and let the charger manage the rest. The compact footprint (7 x 3 x 9 inches) allows installation in tight engine compartments or electrical lockers common on both new and retrofit marine systems.