3-phase 150kVA Transformer 600V to 240V - How many S9 miners can it supply?

[digger888]

Hi there,

I got a 3-phase 150kva step-down transformer from 600V to 240V. I am supplying the input of the transformer with 600V 200A 3-phase, and the output of the transformer is 3-phase 240V. This is going into my 240V 400A disconnect, and then into my 240V 400A power distribution panel.  How many S9 Antminers (1400W) can I run this 150kva transformer?

I calculated 61 units. Can some help me confirm my calculations?

[Lantic_Mining]

Hi there,

I got a 3-phase 150kva step-down transformer from 600V to 240V. I am supplying the input of the transformer with 600V 200A 3-phase, and the output of the transformer is 3-phase 240V. This is going into my 240V 400A disconnect, and then into my 240V 400A power distribution panel.  How many S9 Antminers (1400W) can I run this 150kva transformer?

I calculated 61 units. Can some help me confirm my calculations?

S9's draw more like 1600W when hashing depending on the environmental temp.

1600W / 240v = 6.666 amps per unit
400A / 6.666 = 60 units but with no headroom

If it were me I'd not go above 55 or so units to give a 10% margin and also make sure they can't all start at the same time.

[digger888]

Thanks for confirming my calculations. It seems that I will need several 150kva transformers.

[big al]

At 100% power factor 150 kva  = 150 kw

150 kw / 1.4 kw = 107 miners with no safety margin.

I do not know if you can run up to the nameplate capacity of a transformer.

[big al]

Is the power distribution panel 3 phase as well? If so here's the math

Watts / volts x 1.732

that's how you get amperage draw if you place a single miner across each phase

1400w / 240 x 1.732 = 10.1 amps

400 / 10.1 = 39.6

39 (round down) x 3 = 117 miners

[digger888]

Is the power distribution panel 3 phase as well? If so here's the math

Watts / volts x 1.732

that's how you get amperage draw if you place a single miner across each phase

1400w / 240 x 1.732 = 10.1 amps

400 / 10.1 = 39.6

39 (round down) x 3 = 117 miners

Hi Al,

I searched through the forum and below is my understanding

150kVA, assuming pf =1, and 80% for continuous load = 120kW

120kW/1400W = 85 miners

I have seen people done it the other way around

150kVA is connected to 400A 240V 3 phase panel.

400A * 240V * 1.732 = 166,272 watt

with 80% for continuous load = 133kW

133kW / 1400W = 95 miners

[minefarmbuy]

Did you think about running the Canaan Moose with that kind of set up? Should be more efficient per TH/s than antminer. Maybe even their single 841's as well compared the 13.5 th/s antminer that's available unless you already purchased your hardware.

[banman24]

Your not being limited by the transformer here, your limit is your 400amp 240volt panel. at 80% (I wouldn't recommend going much above 80% though) you can have roughly 46 s9's

fun fact those transformers are under rated and over built. Ask the utility company, on a 2500ka unit they told us they were ok with loading it to 120%

*EDIT* Didn't see this was 3 phase! You are correct on the 95 machines you should be ok hooking those up!