S20FS Spec Sheet 12,000 watt generator head 13,750 watt surge 3600rpm 60hz 1 - 240V/40A outlet with breakers 2 - 120V/20A outlets with breakers The generator is made to fit an engine via belt drive, or direct coupling to an engine shaft. Brushless generator design, 28mm output shaft. A 24 hp or more engine is required for full output. Model S20FS-160BD. 108 lbs