This generator is a 20kw with a 35kw surge, operated by a V-4 Wisconsin engine with triple V-belts, a new battery, and its own gas tank. I have used it to weld equipment in the field and power the yard when REC goes out. It works great, and it is portable (mounted on a compact towable trailer) and self contained. It also has a canopy over it to keep the weather out, but yet let it breathe! It has both 220 and 120 volt connections. Don’t get caught without power when it goes out!!