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Title: 3-phase 150kVA Transformer 600V to 240V - How many S9 miners can it supply? Post by: digger888 on December 13, 2017, 04:58:52 AM 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? Title: Re: 3-phase 150kVA Transformer 600V to 240V - How many S9 miners can it supply? Post by: Lantic_Mining on December 15, 2017, 12:49:40 AM 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. Title: Re: 3-phase 150kVA Transformer 600V to 240V - How many S9 miners can it supply? Post by: digger888 on December 15, 2017, 05:05:11 AM Thanks for confirming my calculations. It seems that I will need several 150kva transformers.
Title: Re: 3-phase 150kVA Transformer 600V to 240V - How many S9 miners can it supply? Post by: big al on December 15, 2017, 06:02:38 AM 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. Title: Re: 3-phase 150kVA Transformer 600V to 240V - How many S9 miners can it supply? Post by: big al on December 15, 2017, 06:08:39 AM 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 Title: Re: 3-phase 150kVA Transformer 600V to 240V - How many S9 miners can it supply? Post by: digger888 on June 29, 2018, 03:43:04 AM 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 Title: Re: 3-phase 150kVA Transformer 600V to 240V - How many S9 miners can it supply? Post by: minefarmbuy on June 29, 2018, 01:48:13 PM 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.
Title: Re: 3-phase 150kVA Transformer 600V to 240V - How many S9 miners can it supply? Post by: banman24 on June 29, 2018, 08:47:06 PM 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! |