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Guest 2731A Guest On-Board Battery Charger 30A / 12V; 3 Bank; 120V Input12V 30 amp 3 bank on-board battery charger. Built-in safety: reverse polarity, over-current, over-voltage, over-temperature and ignition protection. In-line fuses for maximum DC wire protection. 100% Waterproof (IP67) and shock resistant for all fresh and saltwater applications..