The Alternative Fuel or AF Series, Liquefied Petroleum Gas (LPG) or Natural Gas (NG) generators uses the powerful and dependable Ford, Hyundai and GM gaseous engines. These generator units are radiator cooled, use a brushless generator with AVR (automatic voltage regulator) and Digitec 300 control panel. These units also include automatic shutdowns, overflow bottle, interlocking rubber isolation mounts, industrial grade muffler, skid base, battery charger, battery tray, battery hold down and cables. This generator series is able to produce power ratings from 13-150 kW at 60 Hz.