For use where gasoline and propane engines become a hazard. Uses two 12 volt deep cycle type batteries, which produce a 24 volt system for longer operation time. Optional charger available. Batteries are charged on the Power Vac by plugging into the charger, or batteries may be transferred to a charging table and a fresh set replaced for continuous use. Depending on the batteries, 90 minutes of operation is viable. Batteries purchased locally. 1 HP D.C. Motor rated at 3200 RPM. Features a polarized plug for re-charging.