The Miller big blue 500 (907736) comes with a Kubota diesel engine and delivers 500 amps of DC welding output. The generator can produce 27,000 peak watts of power when using 3-Phase or 15,000 watts on single phase. The Kubota heavy-duty T4i diesel engines are the cleanest, greenest diesel power available. These models utilize diesel oxidation catalyst (CDC) technology to keep the air clean with NO exhaust aftertreatment maintenance.