Belt Driven MeccAlte 10200/12000 Watt Generator Head With Outlets #S20W-130BD 10,200 watt continous/ 12,000 watt surge 3600rpm 60hz, 2-120 volt 20 amp outlets, and 1-120/240 volt 30 amp receptacle The generator is made to fit an engine via belt drive, or direct coupling to an engine shaft. Brushless generator design, 7/8" diameter keyed output shaft. A 20 hp or more engine is required for full output.