renting a warehouse how to test the electric output like a pro

[ggbtctalk000]

At least two articles on the internet says 3-phase is in general more efficient, of course there are lot of technicals but I am just covering the high level stuff can not read all of 'em but at least one of the article says it is expensive to convert 3-phase to a single phase. Now I am looking what really expensive means, is it just one time cost of step down transformer in which case i can shoulder or is it lowered efficiency in power throughout the usage, oh god there are so many things to consider, in the end, I hope lord will be watching me lol.  

https://blog.tripplite.com/single-phase-vs-three-phase-power-explained/

3 phase is more efficient....on 3 phase equipment. With a 3 phase building you will end up with a substantial amount of available power because there are 3 legs of power coming in instead of just 2 like in a home.  ANYTIME you step down or up power you end up with less efficiency...that loss is in the form of heat at the transformer. This is why no power supply is 100% efficient.  208 3 phase is what you want over a 480 3 phase power input.  208 3 phase has 120v to ground from each leg OR 208v across any two legs.  480 3 phase is 277v from each of 3 legs to ground or 480v across any 2 legs.  You wouldnt need a stepdown transformer for a 208v 3 phase building. You would be good to go just know that you CANNOT use anything that an electrical motor rated for 240vac (marked 220/230/240) in that building that has 208 3 phase.  They will burn up in very short order.  Now your power supplies will be fat dumb and happy in a 208 3 phase building.  You can run each power feed off of one leg to ground OR you could run them off of 2 phases which would yield 208v.

That is what i thought. The eddy current and all sorts of stuff happening in the transformer, used to study while I was doing EE but that was more than 10 years ago, so does not click much. I am looking at 480 to 240 or 480 to 120 transformer, and if efficiency is not too low I may get one, this is added expense, and who knows transformer will not blow up after constant use, another risk element to put into.

[remauto1187ma]

At least two articles on the internet says 3-phase is in general more efficient, of course there are lot of technicals but I am just covering the high level stuff can not read all of 'em but at least one of the article says it is expensive to convert 3-phase to a single phase. Now I am looking what really expensive means, is it just one time cost of step down transformer in which case i can shoulder or is it lowered efficiency in power throughout the usage, oh god there are so many things to consider, in the end, I hope lord will be watching me lol.  

https://blog.tripplite.com/single-phase-vs-three-phase-power-explained/

3 phase is more efficient....on 3 phase equipment. With a 3 phase building you will end up with a substantial amount of available power because there are 3 legs of power coming in instead of just 2 like in a home.  ANYTIME you step down or up power you end up with less efficiency...that loss is in the form of heat at the transformer. This is why no power supply is 100% efficient.  208 3 phase is what you want over a 480 3 phase power input.  208 3 phase has 120v to ground from each leg OR 208v across any two legs.  480 3 phase is 277v from each of 3 legs to ground or 480v across any 2 legs.  You wouldnt need a stepdown transformer for a 208v 3 phase building. You would be good to go just know that you CANNOT use anything that an electrical motor rated for 240vac (marked 220/230/240) in that building that has 208 3 phase.  They will burn up in very short order.  Now your power supplies will be fat dumb and happy in a 208 3 phase building.  You can run each power feed off of one leg to ground OR you could run them off of 2 phases which would yield 208v.

That is what i thought. The eddy current and all sorts of stuff happening in the transformer, used to study while I was doing EE but that was more than 10 years ago, so does not click much. I am looking at 480 to 240 or 480 to 120 transformer, and if efficiency is not too low I may get one, this is added expense, and who knows transformer will not blow up after constant use, another risk element to put into.

If you have to get a warehouse with 480v 3 phase and are buying 480 to 240 step down transformers you (A) Better have some serious cashola ready and (B) Better hope Bitcoin goes to $100k soon or you will never recoup your investment unless your rigs/farm is already paid for itself.  Id hate to see what a 480v 3 phase power bill looks like!  I know 208 3 phase aint pretty for one of the radar station I take of (power distribution and backup emergency power). 3 phase is more efficient when you dont have to step it down (this is where 208 3 phase comes in handy) but the up front costs along with monthly whether or not you use it can be high.  Me personally if I ever surpass my homes 200a supply then I will just put a shed or small garage on my 5 acres that is dedicated just for that and have another service entrance brought in to that building.

[ggbtctalk000]

Yes, renting a commercial space  is increasingly looking unnattractive as i presume majority of them are equipped with 480v. I Am thinking a land or buhva far out house at cheap and just do the minkng there. It is more peace since u got 100pct control over your property.

[ggbtctalk000]

At least two articles on the internet says 3-phase is in general more efficient, of course there are lot of technicals but I am just covering the high level stuff can not read all of 'em but at least one of the article says it is expensive to convert 3-phase to a single phase. Now I am looking what really expensive means, is it just one time cost of step down transformer in which case i can shoulder or is it lowered efficiency in power throughout the usage, oh god there are so many things to consider, in the end, I hope lord will be watching me lol.  

https://blog.tripplite.com/single-phase-vs-three-phase-power-explained/

3 phase is more efficient....on 3 phase equipment. With a 3 phase building you will end up with a substantial amount of available power because there are 3 legs of power coming in instead of just 2 like in a home.  ANYTIME you step down or up power you end up with less efficiency...that loss is in the form of heat at the transformer. This is why no power supply is 100% efficient.  208 3 phase is what you want over a 480 3 phase power input.  208 3 phase has 120v to ground from each leg OR 208v across any two legs.  480 3 phase is 277v from each of 3 legs to ground or 480v across any 2 legs.  You wouldnt need a stepdown transformer for a 208v 3 phase building. You would be good to go just know that you CANNOT use anything that an electrical motor rated for 240vac (marked 220/230/240) in that building that has 208 3 phase.  They will burn up in very short order.  Now your power supplies will be fat dumb and happy in a 208 3 phase building.  You can run each power feed off of one leg to ground OR you could run them off of 2 phases which would yield 208v.

That is what i thought. The eddy current and all sorts of stuff happening in the transformer, used to study while I was doing EE but that was more than 10 years ago, so does not click much. I am looking at 480 to 240 or 480 to 120 transformer, and if efficiency is not too low I may get one, this is added expense, and who knows transformer will not blow up after constant use, another risk element to put into.

If you have to get a warehouse with 480v 3 phase and are buying 480 to 240 step down transformers you (A) Better have some serious cashola ready and (B) Better hope Bitcoin goes to $100k soon or you will never recoup your investment unless your rigs/farm is already paid for itself.  Id hate to see what a 480v 3 phase power bill looks like!  I know 208 3 phase aint pretty for one of the radar station I take of (power distribution and backup emergency power). 3 phase is more efficient when you dont have to step it down (this is where 208 3 phase comes in handy) but the up front costs along with monthly whether or not you use it can be high.  Me personally if I ever surpass my homes 200a supply then I will just put a shed or small garage on my 5 acres that is dedicated just for that and have another service entrance brought in to that building.

I understand that  by how much? power in at 480v side and power out at 120v side and you will get some ratio right?

[remauto1187ma]

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?

[ggbtctalk000]

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.