^
You can convert a branch to 220v at the breaker box, but that would make all the other outlets on that branch 220. You would need a 220 breaker and then black and white would become hot and ground would become neutral. You would also need to change the outlets to 220 outlets (there are some in a 110ish format and you would need to check your local codes. Pretty sure you don’t want to go that route, but just throwing that out in case you were not aware (I bet you are).
You might want to consider the ProLiant DL380 (DPS-600PB). 12v (Think it can be modded into the 13’s) and 47amps. Supposed to be very reliable and run forever (exaggerating, of course). With a slight modification, the outputs can connected in series. Common for folks to run 2S, 3S, and 4S for 24v, 36v, and 48v, respectively. I saw one where the guy had 2S with jacks for 5, 12, 17, and 24v. I think 2 units would be the max you could run on a typical 110v, 15A home outlet.