I have a variac rated for a maximum output of 30A. The problem is it takes 120V on the input and all of my 120V circuits are 15A, as expected. I unfortunately cannot just add an additional 30A circuit since I live in an apartment.
I have a 240V circuit with a 30A double-pole breaker on it (2x 15A breakers connected together). This goes to a NEMA 6-30R outlet but that means there's no neutral for me to get 120V. Since I live in an apartment and this normally powers my A/C, I'd prefer to not rewire it to be a 120V circuit (the A/C unit already sucks enough as-is; I really don't want to see it struggle with 1/4 of the power it was designed for).
I was wondering if it would be possible to use another transformer to step the 240V down to 120V, and if this would properly split the 30A load across both 15A hot legs so as to avoid starting exciting electrical fires in my wall.
If this is possible, I'm having trouble finding a reasonably-priced transformer with the appropriate power rating (3600VA+, not accounting for any core/coil losses) to do this. I guess I'd be stuck winding my own if I go this route and don't want to spend a ton of cash?
The only other thing I could think of was to rectify the 240, step that down, and then pass that to an H-bridge inverter. No idea if that is workable though, or if the variac can even handle a non-sinusoidal input (I assume it can since it's just a transformer, but I didn't see anything in the product description explicitly stating such).
Any ideas or help are appreciated.