If you’re going to use the adapter we recommend only running it on 20a 120v. Most adapters that come with dual voltage machines are only rated for 120v 20a max. Your best bet to get the full potential out of any 120/240 volt welder is to run it off of 240 volt. 110 is only good for about 120 maybe 130 amp max from a welder but the duty cycle of 60% that they claim probably won't be true.