Bitcoin Forum

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

It's a 100 KVA which means 100KW. A little less actually because the transformer inside doesn't have a perfect power factor.

KVA is "apparent power" while KW is real power. Apparent power is what you would get in a perfect world with no lagging reactive power due to the transformer.

Check out this link: http://www.apcmedia.com/salestools/SADE-5TNQYF/SADE-5TNQYF_R1_EN.pdf?sdirect=true

We're not using PDUs in our data center, just transformer + panels. We have some pics on our website: http://www.asicspace.com/ (http://www.asicspace.com/)

KVA is equivelent to KW?

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

120 volts at 278 amps is 33360 watts

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...

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  :o

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.

http://media.tumblr.com/a59c99cda990a322c93b4ea13b1861da/tumblr_inline_mqhj1iqVts1qz4rgp.gif

Well there goes the hash rate!

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

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

Cheers

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.

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.

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:

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.