When choosing a new or replacement generator, several criteria must be considered to ensure you are getting the right unit. Adding up the entire amperage requirement on the boat will tell you what size unit you need. With multiple refrigeration/freezer units, several tons of chilled air and air -handlers, ice makers, cooktops, microwaves, battery chargers, raw-water pumps, head systems and other necessities that today’s boats require, getting enough juice to supply uninterrupted power is essential for equipment to operate properly. This, along with making sure the unit will fit in the space allotted will help determine the best unit for your needs. Evaluating raw-water feed and fuel-input needs can be adjusted and reconfigured to fit your new unit should they not line up exactly.