1 - 220v
2 - we strip the 16" wire, wrap the 15amp power cable to it, weld with tin put a ribbon and a high fusion tape. (all of my machines are running with this electrical setup for one year)
3 - we try to make the avalons work in another environment (my office inside the building, in a 20 amp power plug) and same problem
4 - did you attach the psu's correctly to the units? Yes I think, i saw some videos (including one of yours) and i think that is correct, i can put some pictures of it if it helps