I would not think the machine needs much to get 110v. Problem is must make a neutral since the machine is feed 220 or multi-voltage 3phase. In the old days electrical code would allow you to use the ground. Now you must have ground and neutral. Kinda like an electric dryer. I looked at my dynasty 350 inside and it looks to be an electrically isolate plug. The torride inside of d280 probably can,t handle a high tap load. So that voltage step is current limited by design purposely. I bought my d350 because the 280 was not available yet. If i had a do over, i would have still got the 350. It is a very tig machine and excellent stick burner on pipe.