Bilge pumps are devices that are used to remove water from the bilge, or the area of a boat where water and other liquids collect. They are an essential part of any boat, as they help to keep the vessel afloat and prevent it from taking on too much water. Bilge pumps typically need between 12 and 24 volts of power to operate, though some models may require more or less. The specific voltage requirements for a particular bilge pump can be found in its owner's manual.