Server PSU for Antminer S1, step by step guide.

[klondike_bar]

Getting this psu this wednesday:
http://www.ebay.com/itm/HP-BLp-Bladeserver-ESP120-2950W-Netzteil-253232-001-226519-001-239161-B21-PSU-/310903465629?pt=PC_Netzteile&hash=item48634a669d&_uhb=1
3kW
Should be enough to power 7 S1's

No!

That psu is out for 51V and not 12V the S1s needs.

Gow did you come up with that?

Aw shit
I fcked up.
I must've read over the obvious line stating it is 50V output...damn..
Maybe I can convert it to 12V with a DC/DC Converter?

not easily or efficiently.

I almost snagged a similar 2500W supply at a recycling place then at the last second saw that 99% of its power came as 48V and the rest was like 0.5A of 5V and 0.02A of 12V

[tzortz]

Right, there is not just the wattage that we should be looking for , but only the combination of the 12v supply with its amperage.

We dont need anything else than 12v.

Klondike, I wonder if you put 4x S1s connected in a row, would they work with 48V?


I believe they would.

[bitcoin4eva]

Nice guide! I guess when tampering PSUs theres a danger of you messing up with the wirings and getting shot to hands with electricity when plugging it in?

[tzortz]

Thanks for your kind words.

What kind of tampering? Except from the pins I mention in the guide?

[GordonBM]

Right, there is not just the wattage that we should be looking for , but only the combination of the 12v supply with its amperage.

We dont need anything else than 12v.

Klondike, I wonder if you put 4x S1s connected in a row, would they work with 48V?


I believe they would.

What do you mean in a row?
In series?

That could work.
In series, the voltage divides, but the amperage stays the same.
In parallel, the amperage divides, but the voltage stays the same.

Maybe there's still hope for that esp120?

[tzortz]

Yes , exactly in series instead of parallel as in other cases.

[GordonBM]

But, isn't that only 2 Ants?
Doesn't each blade use 12v?





OR

Maybe I could fix a voltage divider.

Vout = R2/R1+R2 * Vin

The psu should be giving off ~52V.
We want 12V. So we want a 100Ohm and a 30Ohm resistor.

Vin = 52
R1 = 100
R2 = 30

This should give 12volt on as out.

[GordonBM]

So I did a little research and putting them in series is actually a horrible idea lol
Because if one fails, the others get more juice and will die.
If you put them in series, they must all have the equal amount of impedance and they do not have this. So they will die anyway.
Ah well, looks like I wasted my money.

[klondike_bar]

So I did a little research and putting them in series is actually a horrible idea lol
Because if one fails, the others get more juice and will die.
If you put them in series, they must all have the equal amount of impedance and they do not have this. So they will die anyway.
Ah well, looks like I wasted my money.

figured. The machines are too complex to run in a series anyways for multiple issues. Its a complex device, not just an LED or basic circuit. Additionally the first unit would experience massive amperage through its wires and likelyt burn out

[allcoinminer]

Never run like this.

But, isn't that only 2 Ants?
Doesn't each blade use 12v?





OR

Maybe I could fix a voltage divider.

Vout = R2/R1+R2 * Vin

The psu should be giving off ~52V.
We want 12V. So we want a 100Ohm and a 30Ohm resistor.

Vin = 52
R1 = 100
R2 = 30

This should give 12volt on as out.

[tzortz]

Every electric machine, like S1 is counted as a load witn resistance R.

To be more detailed, the R of S1 is variable and changes from 4 ohm, down to 0.3 ohm at full hashing overclocked.

Now the problem starts when an S1 starts hashing at different timing than others .

That would lead to different overall R, and create also different voltages to each S1.
Different voltages would mean to even higher than 20 or 30 Volts.

I dont believe an S1 can stand that high voltages.

[goldar]

Hello there Goldar,

sure can be switched on and off with a mini switch.

Let me build one and revise the thread.

Keep following the thread.

It would be great.
It comes handy sometimes if you need to reset the miners instead of unplug/plug the power cord.
Please let us know.
Thank you.

[bjalbert]

Can anyone tell me why there are so many wires coming off the positive and ground? I was expecting to see 4 on each for 4 pcie connections. What am I missing?

[klondike_bar]

4 PCIe connectors = 12x GND wires and 12x 12V wires

[GIXXER]

Are the Server Psu's the best way to power the S1's?  Im thinking about ordering 13 more because they're so cheap now.

[loshia]

Are the Server Psu's the best way to power the S1's?  Im thinking about ordering 13 more because they're so cheap now.

Could you post a link where are you getting them in quantities?
10x

[goldar]

Are the Server Psu's the best way to power the S1's?  Im thinking about ordering 13 more because they're so cheap now.

They work great. run 2 s1 no problem.
Using 10 for 3 weeks straight only 1 failed couple days ago (my fault).
Cannot complain - 10 bucks each, cannot beat the price.

[goldar]

Are the Server Psu's the best way to power the S1's?  Im thinking about ordering 13 more because they're so cheap now.

Could you post a link where are you getting them in quantities?
10x

Try that big on-line auction house.
Lots of them listed.
Cannot find one, PM me I send you the link.

[loshia]

Are the Server Psu's the best way to power the S1's?  Im thinking about ordering 13 more because they're so cheap now.

They work great. run 2 s1 no problem.
Using 10 for 3 weeks straight only 1 failed couple days ago (my fault).
Cannot complain - 10 bucks each, cannot beat the price.

Dude where are you getting them from?
A link would be grat
10x

[Darthswan]

Very interesting thread.  I'm really considering moving over to server psu, but scared as hell of tampering with the internals.  I guess I'll order one and go to work on it and see.  I would love to sell some Corsairs.  These are a hell of a lot cheaper. 

I'm looking at the HP 1000W to power 2 over clocked S1s.  Has anyone used this particular psu?  How simple was it to make the conversation? 

Thanks in advance.