How many miners can handle this electrical set up?

[Brunnervac]

I have a warehouse which recently had power upgraded for one of the tenant. The power was upgraded to 480V 3ph at 280 amps.

They had this exact requirement:

We want three groups of power outlets. Each power group will have the following;

480V1 power outlet – rated to 50kW
208V power outlet – rated to 50kW
240V2 power outlet – rated to 20kW

How can I calculate the number of S19 Antminers will this handle? Can someone show me how to calculate this?

[danieleither]

By British terminology, if your incoming power is 480v 3ph @ 280A, that would mean you have 480v between each phase and neutral, and theoretically you could run 124 x S19 Pro if you are able to obtain the right transformers to use all three phases at full capacity.

480 x 280 = 134.4kw per phase.

134.4kw x 3 phases = 403.2kw (403,200 watts) total.

S19 Pro uses 3250w.

403,200w / 3250w = 124.

480v 280A 3ph may not have the same meaning in your country as it does here in UK though.

[Brunnervac]

Thanks!

[mikeywith]

[...]

I am not from the U.K nor have I  seen a 480v transformer but I have strong reasons to believe that you made a mistake in your calculations, I am almost certain that you can't have 480v between each phase and neutral, 480V is between phases, and 277v or 240v if it's high leg delta between each phase and a neutral.

This means the math has to change to 240 or 277 * 280 = either 67,200kw or 77,560kw if it's 277v, and since you can't really go past 80% load, I'd guess the transformer will only be happy with at a 20% reduction, which is either 53kw on 240v or 61kw on 277v, that will be a total of 159kw or 183kw.

Now if I am wrong, i.e you really get 480v between each phase and N, then the number of miners you can run on this transformer is exactly ZERO because no miner on planet earth works on 480V.

[Brunnervac]

Thanks . It shows on the panel 480V/ 277 so I believe you have a good point.

[danieleither]

[...]

That's why I added the disclaimer "by British terminology". There is no error in my calculation, however I doubt it is 480v 280A 3ph (at least not in the way it would mean here in the UK).

I have 240v 200A 3-phase at 2 of my sites, which is effectively 144kw total (everything maxed out). Voltage is 240v between any phase and neutral, or 415v when measured between two phases.

[mikeywith]

That's why I added the disclaimer "by British terminology". There is no error in my calculation, however I doubt it is 480v 280A 3ph (at least not in the way it would mean here in the UK).

Sorry, your calculation is not wrong, bad wordings (as usual) on my end, excuse my English.

Thanks . It shows on the panel 480V/ 277 so I believe you have a good point.

Then you have 277v*280a * 3 * 0.8, that's roughly 185kw in total, but you have bigger problems to worry about, most mining gears won't work on 277 volts, IIRC someone mention 255v was good on some T17 but not all, I think most folks who have 277v use Microbt gears, of course, not all Microbt gears support 277v but they do have a few options like the models that use p21 PSU, I had this voltage conversation like a year ago, and I am a bit too old and my memory isn't so great, so take the voltage info with a spoon of salt and do more research in that regards.