Anybody with Electricity Knowledge or Server room SET ups HElp!! - page 2.

allanh

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Quote from: venom2049 on May 15, 2014, 07:09:30 PM

Well this is what I wanna do before I get more confused, I have a warehouse with a panels that has a 3 phase 208v layout. I have 6 cointerras ready to be plug in but i wanna switch to 240 so I can be a bit more efficient. what do i do?

Unless the utility offers 240V there (which is doubtful), you can't. Okay, you could get boost transformers to convert to 240V, but the loss in the transformers would negate any small efficiency gain you might get in the downstream power supplies. Have you examined the efficiency curves for the supplies to see what the efficiency difference would be?

venom2049

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Quote from: DeathAndTaxes on May 15, 2014, 06:54:02 PM

Quote from: allanh on May 15, 2014, 06:32:36 PM

3 phase (208V single phase is unusual, if not nonexistent).

208V single phase PDU is very common. A single 3 phase drop is split into three 1 phase drops and a single phase PDU used for each one. In a datacenter usually racks are 30A or less so it allows you to power three racks using a single drop and three PDUs.

Well this is what I wanna do before I get more confused, I have a warehouse with a panels that has a 3 phase 208v layout. I have 6 cointerras ready to be plug in but i wanna switch to 240 so I can be a bit more efficient. what do i do?

DeathAndTaxes

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Gerald Davis

Quote from: allanh on May 15, 2014, 06:58:15 PM

Should have said 208V single phase from the utility is unusual if not nonexistent.

Gotcha. Yeah that would be unusual.

allanh

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Quote from: DeathAndTaxes on May 15, 2014, 06:54:02 PM

Quote from: allanh on May 15, 2014, 06:32:36 PM

3 phase (208V single phase is unusual, if not nonexistent).

208V single phase PDU is very common. A single 3 phase drop is split into three 1 phase drops and a single phase PDU used for each one. In a datacenter usually racks are 30A or less so it allows you to power three racks using a single drop and three PDUs.

Should have said 208V single phase from the utility is unusual if not nonexistent. Certainly the premises can then be wired with 208V 3-phase circuits, 208V 1-phase circuits, and 120V 1-phase circuits.

DeathAndTaxes

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Gerald Davis

Quote from: allanh on May 15, 2014, 06:32:36 PM

3 phase (208V single phase is unusual, if not nonexistent).

208V single phase PDU is very common. A single 3 phase drop is split into three 1 phase drops and a single phase PDU used for each one. In a datacenter usually racks are 30A or less so it allows you to power three racks using a single drop and three PDUs.

venom2049

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Quote from: 2112 on May 15, 2014, 06:40:35 PM

Quote from: venom2049 on May 15, 2014, 05:54:12 PM

Well Im looking to set 5 cointerra miners at a shop using 208 v, some I was looking to get a PDU3VN10G60 which supposedly can feed up to 12600 watts but then when I was reading the specs says that I will only take 35 amps of input.

here is the link

http://www.tripplite.com/sku/PDU3VN10G60/

Can anybody explain to me how this works?? How will I ever put 12600 watts on a PDU that can only take 35 amps??

I would really appreciate any feedback, thanks.

Nico

It is a 3-phase device. Maximum output current is in each phase is 20A. 3*20A*208V=12480W.

Basic introduction to 3-phase systems:

http://en.wikipedia.org/wiki/Three-phase
http://en.wikipedia.org/wiki/Three-phase_electric_power

5 Terraminers have 10 power cords, each drawing 2100W/2/210V = 5A.

You can't distribute them evenly amongst 3 phases. The closest is 3+3+4. So it will be drawing 15A+15A+20A. One circuit is at its maximum. Any further asymmetry and they will start tripping the breakers.

It could work if all the Terraminers have perfect power supplies with perfect load sequencing.

I think Im just gonna buy 3 of this ones

Tripp Lite PDUMV30HV Metered 208/240V 30A 10 ft PDU

http://www.newegg.com/Product/Product.aspx?gclid=CNCZ9MuNr74CFYFQOgodtRsAzg&Item=N82E16812120338&nm_mc=KNC-GoogleAdwords&cm_mmc=KNC-GoogleAdwords-_-pla-_-Power+Distribution+Unit-_-N82E16812120338&ef_id=U27rvwAABTlJ2oNO:20140515234229:s

DeathAndTaxes

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Gerald Davis

As pointed out that is a 3 phase device. Unless your premises is wired for 3 phase power that PDU is useless. If you don't know then it isn't.

2112

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Quote from: venom2049 on May 15, 2014, 05:54:12 PM

Well Im looking to set 5 cointerra miners at a shop using 208 v, some I was looking to get a PDU3VN10G60 which supposedly can feed up to 12600 watts but then when I was reading the specs says that I will only take 35 amps of input.

here is the link

http://www.tripplite.com/sku/PDU3VN10G60/

Can anybody explain to me how this works?? How will I ever put 12600 watts on a PDU that can only take 35 amps??

I would really appreciate any feedback, thanks.

Nico

It is a 3-phase device. Maximum output current is in each phase is 20A. 3*20A*208V=12480W.

Basic introduction to 3-phase systems:

http://en.wikipedia.org/wiki/Three-phase
http://en.wikipedia.org/wiki/Three-phase_electric_power

5 Terraminers have 10 power cords, each drawing 2100W/2/210V = 5A.

You can't distribute them evenly amongst 3 phases. The closest is 3+3+4. So it will be drawing 15A+15A+20A. One circuit is at its maximum. Any further asymmetry and they will start tripping the breakers.

It could work if all the Terraminers have perfect power supplies with perfect load sequencing.

allanh

newbie

Activity: 3

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3 phase (208V single phase is unusual, if not nonexistent).

35A * 208V * sqrt(3) = 12600W

venom2049

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Quote from: solarion on May 15, 2014, 06:16:57 PM

Quote from: venom2049 on May 15, 2014, 05:54:12 PM

Well Im looking to set 5 cointerra miners at a shop using 208 v, some I was looking to get a PDU3VN10G60 which supposedly can feed up to 12600 watts but then when I was reading the specs says that I will only take 35 amps of input.

here is the link

http://www.tripplite.com/sku/PDU3VN10G60/

Can anybody explain to me how this works?? How will I ever put 12600 watts on a PDU that can only take 35 amps??

I would really appreciate any feedback, thanks.

Nico

P(power) = I(current) x E(voltage)

12600(w)/35(amps) = 360v

the specs says 12.6 kWatts / 208 Volts / then its says 60 amps output but 35 input??

solarion

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Quote from: venom2049 on May 15, 2014, 05:54:12 PM

Well Im looking to set 5 cointerra miners at a shop using 208 v, some I was looking to get a PDU3VN10G60 which supposedly can feed up to 12600 watts but then when I was reading the specs says that I will only take 35 amps of input.

here is the link

http://www.tripplite.com/sku/PDU3VN10G60/

Can anybody explain to me how this works?? How will I ever put 12600 watts on a PDU that can only take 35 amps??

I would really appreciate any feedback, thanks.

Nico

P(power) = I(current) x E(voltage)

12600(w)/35(amps) = 360v

venom2049

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then why do they advertise 12600 watts ??

Entropy-uc

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You can't.

You will need 2 30 amp 208V circuits to power those 5 machines. And a lot of cooling capacity.

venom2049

member

Activity: 90

Merit: 10

Well Im looking to set 5 cointerra miners at a shop using 208 v, some I was looking to get a PDU3VN10G60 which supposedly can feed up to 12600 watts but then when I was reading the specs says that I will only take 35 amps of input.

here is the link

http://www.tripplite.com/sku/PDU3VN10G60/

Can anybody explain to me how this works?? How will I ever put 12600 watts on a PDU that can only take 35 amps??

I would really appreciate any feedback, thanks.

Nico

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