Unfortunately that is going to prove challenging with the latest Bitmain models, where the psu is customized. Which is a big issue if, for example the S15s failure rate at 240v really is higher than usual. Where do you get a replacement PSU not made by bitmain?
I have been trying to figure that one out for my company already as the PSUs are 20v instead of 12v making our entire stockpile of PSUs obsolete.