House battery is described as the deep-cycle battery that powers the motorhome, 12-volt DC electrical system, separate from the chassis. Powers the coach lights, water pump, furnaceblower, vent fans, stereo, refrigerator (in 12-volt mode) and other house equipment. The number and rating of house batteries used depends on the motorhome's battery compartment size and the motorhomer's camping tendencies. Motorhomers who frequently use electric hookups in campgrounds may not need to carry as many house batteries.