Dometic's Cuddy dc is a compact 3,500 BTU/hr cool-only air conditioner designed to work with 12-volt power systems. Energized by a dedicated bank of batteries and a dedicated power module, the Cuddy dc makes your small cabin a refuge from the heat and sun.
Compact - about the size of a typical battery box - this low-profile unit easily fits beneath a V-berth or below-deck storage.