P=vi, I=p/v , I=2700/230, I =11.7amps, but the welder will have a transformer, how big is the welder, mine is a clarke 131 teor maybe 135, cant remenber, but id reckon my welder would run of that genny, also another thing, some gennies you can set the revs high, or to adapt to the load, you want...