.05 BTC bounty - act now! | Bitcointalksearch.org

ASICSPACE

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Quote from: Trends on December 31, 2014, 08:15:49 PM

Each of the 3 distribution panels (208/120 breaker panels) would have a 225 amp main breaker, not one single 225A breaker on the 208V output of the transformer.

Transformers are sized to permit 100% of their rating therefore 278 Amps (100080 watts) of 208V is avaliable for the 3 distruibution panels to share depending on connected load at each panel. In theroy it would be possible to load up the distribution panels (even following the 80% rule) to exceed the 278A output of the transformer but doing so would cause the main transformer breaker to trip on overload.
Best to have a qualified electrician or electrical eng review your plans.

Trends

Always a good idea to get a review by an expert. Some transformers can be overloaded depending on their insulation class and ambient temperature.

Trends

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Each of the 3 distribution panels (208/120 breaker panels) would have a 225 amp main breaker, not one single 225A breaker on the 208V output of the transformer.

Transformers are sized to permit 100% of their rating therefore 278 Amps (100080 watts) of 208V is avaliable for the 3 distruibution panels to share depending on connected load at each panel. In theroy it would be possible to load up the distribution panels (even following the 80% rule) to exceed the 278A output of the transformer but doing so would cause the main transformer breaker to trip on overload.
Best to have a qualified electrician or electrical eng review your plans.

Trends

sbogovac

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Quote from: Soros Shorts on December 30, 2014, 01:39:27 PM

Quote from: sbogovac on December 30, 2014, 01:26:28 PM

Quote from: ASICSPACE on December 30, 2014, 12:20:17 PM

[...]

Quote from: sbogovac on December 30, 2014, 12:17:10 PM

Still don't understand how this will "supply" any "watts to [12V] mining equipment [OP]" though...

That's the job of the power supplies.

So - basically - you're saying "this PDU" will not be "supplying" any "Watts to mining equipment...?

And even if you assume any role for PSU's than certainly those 100KW will not reach cet "mining equipment"...?

I believe most people who read this thread will understand the context that the 100KW is the "at-the-wall" power consumption of the equipment, before any losses due to PSU inefficiencies or wiring losses downstream of the PDU.

Possibly, but some (like the OP, maybe) won't:

Quote from: yochdog on December 29, 2014, 02:09:34 PM

I am not that good when it comes to electrical matters.

First person to tell me (correctly) how many watts this PDU can supply to mining equipment, wins the bounty:

http://www.ebay.com/itm/PDI-PDU-100-KVA-480v-x-208v-3-Panel-Manuifactured-2009-/121527983792?pt=US_Uninterruptible_Power_Supplies&hash=item1c4ba1deb0

Soros Shorts

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Quote from: sbogovac on December 30, 2014, 01:26:28 PM

Quote from: ASICSPACE on December 30, 2014, 12:20:17 PM

[...]

Quote from: sbogovac on December 30, 2014, 12:17:10 PM

Still don't understand how this will "supply" any "watts to [12V] mining equipment [OP]" though...

That's the job of the power supplies.

So - basically - you're saying "this PDU" will not be "supplying" any "Watts to mining equipment...?

And even if you assume any role for PSU's than certainly those 100KW will not reach cet "mining equipment"...?

I believe most people who read this thread will understand the context that the 100KW is the "at-the-wall" power consumption of the equipment, before any losses due to PSU inefficiencies or wiring losses downstream of the PDU.

sbogovac

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I don't believe in denial.

Quote from: ASICSPACE on December 30, 2014, 12:20:17 PM

[...]

Quote from: sbogovac on December 30, 2014, 12:17:10 PM

Still don't understand how this will "supply" any "watts to [12V] mining equipment [OP]" though...

That's the job of the power supplies.

So - basically - you're saying "this PDU" will not be "supplying" any "Watts to mining equipment...?

And even if you assume any role for PSU's than certainly those 100KW will not reach cet "mining equipment"...?

Soros Shorts

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Quote from: yochdog on December 29, 2014, 02:13:30 PM

KVA is equivelent to KW?

I thought there was a conversion involved.....

It is actually

KW = KVA x (power factor)

but the power factor of modern switching power supplies with active PFC that you find in mining equipment is usually very close to 1.0, so most people don't bother to account for it.

ASICSPACE

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Quote from: sbogovac on December 30, 2014, 12:17:10 PM

Quote from: ASICSPACE on December 30, 2014, 11:26:05 AM

Quote from: gdale on December 30, 2014, 12:57:50 AM

okay its out is this 225amp max at a 208volt's max this is because of 225 Amp Main Breaker this puts it at 46.8 kw's here is a calc for it
http://www.rapidtables.com/calc/electric/power-calculator.htm

put in the volts output of 208 and amps max is the main breaker of 225amps
hope this helps

edit its not 3 phase as no power factor is listed in spec

First of all you can tell there's a 480/277 to 208/120 transformer in here because those are the voltages listed in the listing, which clearly indicates three phase power because 208 is the line to line voltage between two of the phases and 120 is the line to neutral voltage between a phase and the neutral.

Also you multiplied the output line to line voltage by the input current, incorrectly. After the current passes through the transformer it will will increase (as indicated in the listing) because a transformer will change the voltage, and the current, but the power remains the same. P = (V1 x I1) = (V2 x I2).

Still don't understand how this will "supply" any "watts to [12V] mining equipment [OP]" though...

That's the job of the power supplies.

sbogovac

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I don't believe in denial.

Quote from: ASICSPACE on December 30, 2014, 11:26:05 AM

Quote from: gdale on December 30, 2014, 12:57:50 AM

okay its out is this 225amp max at a 208volt's max this is because of 225 Amp Main Breaker this puts it at 46.8 kw's here is a calc for it
http://www.rapidtables.com/calc/electric/power-calculator.htm

put in the volts output of 208 and amps max is the main breaker of 225amps
hope this helps

edit its not 3 phase as no power factor is listed in spec

First of all you can tell there's a 480/277 to 208/120 transformer in here because those are the voltages listed in the listing, which clearly indicates three phase power because 208 is the line to line voltage between two of the phases and 120 is the line to neutral voltage between a phase and the neutral.

Also you multiplied the output line to line voltage by the input current, incorrectly. After the current passes through the transformer it will will increase (as indicated in the listing) because a transformer will change the voltage, and the current, but the power remains the same. P = (V1 x I1) = (V2 x I2).

Still don't understand how this will "supply" any "watts to [12V] mining equipment [OP]" though...

ASICSPACE

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Quote from: gdale on December 30, 2014, 12:57:50 AM

okay its out is this 225amp max at a 208volt's max this is because of 225 Amp Main Breaker this puts it at 46.8 kw's here is a calc for it
http://www.rapidtables.com/calc/electric/power-calculator.htm

put in the volts output of 208 and amps max is the main breaker of 225amps
hope this helps

edit its not 3 phase as no power factor is listed in spec

First of all you can tell there's a 480/277 to 208/120 transformer in here because those are the voltages listed in the listing, which clearly indicates three phase power because 208 is the line to line voltage between two of the phases and 120 is the line to neutral voltage between a phase and the neutral.

Also you multiplied the output line to line voltage by the input current, incorrectly. After the current passes through the transformer it will will increase (as indicated in the listing) because a transformer will change the voltage, and the current, but the power remains the same. P = (V1 x I1) = (V2 x I2).

kabopar

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Quote from: gdale on December 30, 2014, 12:57:50 AM

okay its out is this 225amp max at a 208volt's max this is because of 225 Amp Main Breaker this puts it at 46.8 kw's here is a calc for it
http://www.rapidtables.com/calc/electric/power-calculator.htm

put in the volts output of 208 and amps max is the main breaker of 225amps
hope this helps

edit its not 3 phase as no power factor is listed in spec

power factor has nothing to do with being 3 phase or 1 phase

https://en.wikipedia.org/wiki/Power_factor

Cheers

gdale

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okay its out is this 225amp max at a 208volt's max this is because of 225 Amp Main Breaker this puts it at 46.8 kw's here is a calc for it
http://www.rapidtables.com/calc/electric/power-calculator.htm

put in the volts output of 208 and amps max is the main breaker of 225amps
hope this helps

edit its not 3 phase as no power factor is listed in spec

stan258

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Quote from: klondike_bar on December 29, 2014, 08:11:21 PM

Quote from: yochdog on December 29, 2014, 02:13:30 PM

KVA is equivelent to KW?

I thought there was a conversion involved.....

not really. Watts = Volts x Amps --> W=VA -----> KVA=KW

there is some discrepency depending on your voltage input/output and other factors, but 100KVA means about 208A of 480V input power. Safe practice dictates keeping full-time load at less than 80%

Manufactures generally advertise max potential in a perfect set up not constant supply, Klondike is correct.

Edit - - - - TrippLite has had to re name several of their 220 - 240 PDUs because nobody in their right mind will ramp them up to full marketed AMPs

klondike_bar

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ASIC Wannabe

Quote from: yochdog on December 29, 2014, 02:13:30 PM

KVA is equivelent to KW?

I thought there was a conversion involved.....

not really. Watts = Volts x Amps --> W=VA -----> KVA=KW

there is some discrepency depending on your voltage input/output and other factors, but 100KVA means about 208A of 480V input power. Safe practice dictates keeping full-time load at less than 80%

dogie

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Well there goes the hash rate!

ASICSPACE

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Quote from: yochdog on December 29, 2014, 02:24:43 PM

Quote from: ASICSPACE on December 29, 2014, 02:17:55 PM

Quote from: yochdog on December 29, 2014, 02:13:30 PM

KVA is equivelent to KW?

I thought there was a conversion involved.....

Nope, generally when you use KVA you're talking about the rating of equipment, while when you use KW you're talking about actual power usage.

Make sure to load each phase evenly otherwise you'll cause harmonics.

BTC address: 1KDDR9VrkjXugxrsnT4BjDWbNbyYDwSCC1

OK, you win.

Coming your way.

Got it, thanks! Feel free to PM me if you have any more questions. If you're trying to mine, I may be able to give you some pointers that can save you lots of money. Check out the mine we're building, link in my signature.

yochdog

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Quote from: ASICSPACE on December 29, 2014, 02:17:55 PM

Quote from: yochdog on December 29, 2014, 02:13:30 PM

KVA is equivelent to KW?

I thought there was a conversion involved.....

Nope, generally when you use KVA you're talking about the rating of equipment, while when you use KW you're talking about actual power usage.

Make sure to load each phase evenly otherwise you'll cause harmonics.

BTC address: 1KDDR9VrkjXugxrsnT4BjDWbNbyYDwSCC1

OK, you win.

Coming your way.

ASICSPACE

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Quote from: yochdog on December 29, 2014, 02:13:30 PM

KVA is equivelent to KW?

I thought there was a conversion involved.....

Nope, generally when you use KVA you're talking about the rating of equipment, while when you use KW you're talking about actual power usage.

Make sure to load each phase evenly otherwise you'll cause harmonics.

BTC address: 1KDDR9VrkjXugxrsnT4BjDWbNbyYDwSCC1

bonds

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Quote from: ASICSPACE on December 29, 2014, 02:16:21 PM

Quote from: bonds on December 29, 2014, 02:14:41 PM

120 volts at 278 amps is 33360 watts

That's another way to look at it, but you forgot it's 3 phase so 120*278*3 = 100080 watts = 100 kw

Sheesh thats insane Shocked

ASICSPACE

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Quote from: bonds on December 29, 2014, 02:14:41 PM

120 volts at 278 amps is 33360 watts

That's another way to look at it, but you forgot it's 3 phase so 120*278*3 = 100080 watts = 100 kw

sbogovac

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I don't believe in denial.

None,

It clearly states:
SPECIFICATION
OUTPUT
208/120 volts

I don't know which miners you had in mind, but generally ASIC miners run at 10-12 volts...

Topic: .05 BTC bounty - act now! (Read 2160 times)