In the process of buying my first boat (1989 Catalina 30). As far as electric system, all I know right now is that it has 2 group 31 AGM Deka Intimidator batteries. The boat is currently connected to shore power, but I would keep it on a mooring.
Exactly how does the battery charger work? Is it related to shore power, or does it have a role when on a mooring?