I use a 240 and then have a UPS that will smooth out the power down to 220-230. An extra piece of expensive hardware, but the industrial power in the warehouse I have my miners isn't always the most reliable, so I'm happy with the extra safety.
Hello wavelengthsf...what is the capacity of your transformer? How expensive is to get to UPS? Do you have anything for surge protection as well or you just rely on UPS for those? Thanks.