Anybody with Electricity Knowledge or Server room SET ups HElp!!

[venom2049]

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

[Entropy-uc]

You can't.

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

[venom2049]

then why do they advertise 12600 watts ??

[solarion]

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]

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??

[allanh]

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

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

[2112]

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.

[DeathAndTaxes]

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.

[venom2049]

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]

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.

[allanh]

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]

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

Gotcha.  Yeah that would be unusual.

[venom2049]

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?

[allanh]

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?

[2112]

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?

That's only doable with the agreement with your electrical utility. I believe it is called "high leg delta" 3-phase.

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?

No additional transformers are required with the "high leg delta" hookup. But the efficiency difference will be minuscule. There maybe a surcharge from the utility for supplying this old-style, asymmetric power that will negate any efficiency savings.

http://en.wikipedia.org/wiki/High-leg_delta

Anyway, you clearly need to talk to certified electrician and the warehouse owner, because the change to "high leg" may make the rest of the warehouse unsafe.

[2112]

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?

I just noticed that you now have 6 terraminers instead of 5 in the original post.

Then another cheaper option is to get 240V 3-phase 3-wire with an additional electric meter. 6 miners will form a sufficiently symmetric load that won't require the neutral wire.

But you clearly will need help of an electrician and cooperation from the utility.

The Company's nominal secondary service voltages are 120 volts single phase, 120/240
volts, 3 wire single phase, 240 volts 3 phase 3 wire, 120/240 3 phase 4 wire, 120/208 3
phase 4 wire, 277/480 volts 3 phase 4 wire.

Those are the types of service that an example US electrical utility offers that do not require negotiation, just a matter of ordering and waiting for provisioning.

[2112]

And just to wrap it all up for both US and non-US readers I've accidentally found a nice short link showing pretty much all modern configurations available around the globe:

http://www.ccontrolsys.com/w/Electrical_Service_Types_and_Voltages
http://www.ccontrolsys.com/w/Four_Wire_Delta_Circuits
http://www.ccontrolsys.com/w/Three-Phase_Grounded_Delta_Circuits

[klondike_bar]

just to add a few comments:

1) 208V is definitely better. more power per plug, PSU wires carry half the amperage and dont warm up (mostly if 18awg), and the mains wiring also doesnt need to be as thick as for 110V
2) unless the PDU is just handy to you, be careful. those specialised plugs and multi-phase wiring can end up costing a lot more than cheaper alternatives. One of those 3-phase specialty outlets may cost well over $100, and if you use a 3-pole circuit breaker you are looking also well over $100. (a single pole is around $20)

2a)  NEMA L6-30. receptacles are $50 new or easily found used for <$20. They carry 30A (or almost 5kW after the 80% rule), and fit generic receptacle boxes.
2b) Use typical household 20A 110V outlets (NEMA 5-20) to carry 208V, thus allowing you to use extremely common parts and cords.  *this is very much against code, and a ghetto-solution*

[venom2049]

Well the warehouse owner is a Master Electrician that does most electrical work around my area many years of experience. His panel is 200 amp panel with 3 phases. He is gonna pull from that panel 5 240 volts outlets to feed 5 of those L6-20A PDUs, each PDU will be connect to one Cointerra so will be only using a bit less than 10 amps per PDU. Anything wrong with this idea?? am I missing something??

[Zich]

Well the warehouse owner is a Master Electrician that does most electrical work around my area many years of experience. His panel is 200 amp panel with 3 phases. He is gonna pull from that panel 5 240 volts outlets to feed 5 of those L6-20A PDUs, each PDU will be connect to one Cointerra so will be only using a bit less than 10 amps per PDU. Anything wrong with this idea?? am I missing something??

More like i miss something here, why did you choose to use those type PDU?