ProNauticP Series chargers are designed for cuddies, cruisers, sailboats, yachts and commercial larger fishing boats. Boats in this class typically have a common ground and are set up for shore power AC and sometimes include the use of a generator and or an inverter on board. A 12V DC common ground system is typical for most boats, however larger boats and commercial boats may be utilizing a 24V, 32V or 36V common ground DC system.