Norpros' Alternative Fuel Series uses the powerful and durable GM (General Motors) and Ford engines. These engines series are able to produce power ratings from 13 -125 kW at 60 Hz and 8 -100 kVA at 50 Hz. Norpro's Digitec 300 Controller is now standard on all Alternative fuel Series generators. Norpro's NEW Digi-tec 400 is now available as an upgradeable option. For more information on the Digi-tec 400 please CLICK THIS LINK.