It would be a 4:1 stepdown going from 480 to 120v. The current would end up being 4 times higher on the 120 side vs the 480 side though not including losses. Price one....they aint cheap at all. How big of area do you need? How much land do you already own? Theres peace of mind having better security at your own place instead of having to worry about someone breaking into your warehouse across town. The gas back and forth will to the warehouse will more than enough pay for a couple German Shepherds to roam your own land around your own building. There are options. Prefab outbuildings, sheds, garages and even custom builds along with DIY. FYI Bring in a prefab shed and they put it where you want it, there are many places that will build to your spec and most places dont charge you property tax on the sq footage since its not considered a permanent structure like a garage. Sit the shed on cinder blocks, crushed rock or even on its own skids. I have enough room to to put many of those on my house lot before Id have to start getting into my woods and start clearing. The startup costs for a prefab shed, its own electrical (internal and the power feed) and ventilation/air conditioning are quite attractive.
How many Gpu's are you talking about here that need to be put to work? What kind are they?
Certainly there are i2r losses but I dont expect pathway between 120v side to PC-s will be longer than normal household wire length. Sent inquiry to one of the transformer manufacturer and said to me at least heat loss should not be a problem but i have to account for any possible negativity. I dont expect big area probably 10-15 miners 1st year but where live in CA the cost of electricity+tax is so much, i dont own house but condo so no land, so traveling to closes state NV for rental, with 20 gpus running in my condo, the electricity actually now costs more than if i do a small warehouse rent in NV. so that is what i am doing, at the same time, i am looking at cheap isolated small houses across state border to see if i can. If i manage to get something working NV just beyong the state line, then travel is reasonably 3-4hrs drive, i'd consider it manageable.