Bitcoin Forum

I thought it might be good to share my experience of what I feel is improving the design of the S1 Antminers.
This is my first parse, I'm already revising my design to mount both fans on the front.

At current they have a front and back mounted fan. 

The fans are Nidac 12v 2.7amp Beta V. I use two fans per ant miner to keep them nice and cool to add a level of redundancy in case of PSU failure I run the fans in two banks each powered of a cheapish PSU in my case some old cool masters that I had around.  I chose the p1 and p2 connectors that can supply enough amperage for the fans.  Thats the main thing with these just make sure they are attached to cables that can take the power 12v * 2.7amp * 4 = 129Watts per bank.

http://www.netring.co.uk/content/images/fans.JPG

My ants are running at around 190-205gh each and are staying around 33ish degrees which I class as a win.
Powering the fans direct off a separate PSU drops the drain on the main corsair 750 I'm using, this is what I believe allows me to run two ant miners off of one corsair 750 PSU.  At the wall they are drawing about 1600 Watts, which is a little over what the PSU are rated at but they are running cool.  Obviously try this at your own risk!

http://www.netring.co.uk/content/images/ants1.JPG

What I want to do is build an alert system in on fan failure, I'm probably going to do this with two parses, step one possibly a basic amp meter on the fans which switches of the related miners on a failure.  Long term I might rig this up to a raspberry PI so I can monitor them remotely and get alerts.

If anybody is interested or done anything similar I would love to know?

Also if any body wants to send me a tip because they think its a good idea they can to
14qF1hj3SxAzyWkCxrkgSYPikM7faKqKAV

Operating at peak load I would expect a CX750 to draw 937 Watts at the wall or 1875 for two of them.

The 750Watt rating is power supplied to the attached devices and CX750's are rated to be 80% efficient so 750/.8 = 937.5 Watts at the wall when operating at peak load.

Why do you think these fans are better than the stock fans?

Electricites

Rule #1.
Do NOT overload circuits.

I've had one of the stock fans fail.
Yes I had read they could cope with more then the 750 so they are within operating limits with the 4 ants.
I'm drawing 1680 Watts at the wall according to my monitor.

As they don't keep the ants cool enough even running at 190-200 gh they are only at about 34 with the new fans, I run two fans in case one cuts out, thus the ants don't cook them selves.
Also i'm not to sure how reliable they are, I've chosen a fan that I know is regularly used on servers and has a good reliability track record.

That hasn't been my experience.  The speed of the stock fans is controlled by Ant's controller board based on the reading from the on board temp sensor.  The stock fans never even run at top speed in my experience you can test this by unplugging the fan control cable and your fan will accelerate to top speed which is considerably higher than it's normal speed.

At any rate, it's your money but I don't see any reason to believe there is a benefit to this.

I have 4 running off a single Dell 2100W server PSU.

Funnily enough I was taking some old servers apart yesterday to see what PSU were in them, I haven't managed to figure out the wiring on them yet though as they are hot swappable PSU's

I've taken apart four different servers so far trying to do the same thing.  So far I have a 100% failure rate but I have a PowerEdge 2950 coming out of service soon and I am hoping that will give me one win.

you have done a nice job on temp control!


 But you are overloading your psu. and 1680 watts is not acceptable on a 15 amp 120 volt circuit for 24/7/365 work.


15 amp x 120 volt =1800 watts x 80 percent = 1440 watts


1680 on a 15 amp circuit = bad bad bad

and running your psu to redline is also bad  bad bad  bad.

I smell melting rubber bro!  but I really like the cooling ideas the rack is also nice

If you go back and read he says he is only powering two Ants off of each 750 PSU so I'm pretty sure his 1600 number is for 4x Ants and 2x PSUs plus a PSU to power the fans.

yeah i get that, but if they are plugged into the same wall/circuit he is overloading the circuit.

  and running 2 ants 24/7/365 on a 750 watt psu is overloading his psu.  but He has a nice rack to keep them cool along with a good fan setup.

Fortunately, its 240v and its a 30amp circuit.

I'm running this from a ware house so I have fitted a heat extractor for the room.
I am curious though do a lot of people run multiple units from home? As then I would see there be an issue with overloading your house supply?

Yeah, on the plus side if you have enough Ants you can turn off your furnace in the winter months.

Do you have both fans pulling in the same direction?

Otherwise it would not make any sense.  :D

Main fan push, add fan pull.

It does if you turn the ant upside down.

If it is the right way up then the 2nd fan just pulls a little air in through the aluminium vents, a little over the last chips and a lot from everywhere else. If you turn the ant upside down and push the air in from the second fan then the shape of the aluminium vents pushes the air up and out, cooling the  aluminium vents and the chips far more.

I have been playing with this as an alternative to a tunnel but I still cannot beat the cooling of a tunnel with the original fan pulling air from the tunnel.

I have no idea what you talking about? Original fan not pull air out, the original fan blow air in.

Here in civilisation, we have real electricity.  240V with 30A per circuit, with most houses having a minimum of two circuits.  The houses here have 100A supplies, which is 24kW.  Good luck overloading with miners.

It is more efficient to pull air out of a tube or tunnel than pushing air in. If you put the ant in a tunnel then you turn the original fan around to pull air out.

Maybe, i would not bet on that.

But with 2 Fan (1 additional on the other end) its sure more effective to blow air on 1 side in, and pull on the other side out.

Yes but look what it's done to your teeth!

I dunno I am confused how my 200A 240V service to my house is a "problem" and I'm in the US. 

Seems pretty standard where I am...

I have one fan setup as they come out of the factory, But then I have another fan at the other end pulling air out.
It seems to work quite well at the moment between the 4 i'm getting around 800gh and they are running cooly.

I've added an extraction fan to the room which is then pumping the air into the coolest part of the warehouse, its a bit noisy but people are appreciating the extra heat.  The 4 ants are using about the same wattage as one of our electric heaters, so I'm basically getting paid for some of our heating bill.

Excellent today another difficulty increase :-)

I would bet, lots, it is physics 101, what is easier, to push air into a small box or push air into a bigger box? Push or pull depends on where your mind is in relation to the force and if you are in a room with no air con pushing air in, then that bigger box of a room is a big as the world's atmosphere.

If I get time this weekend I will do some tests on my thoughts about upside down miners with push-push fans and report the results.

To be honest, my fan at my desk cool down my face better, when blow air in my face, not when suck the air out my face.  ;D