I'm looking at a similar heat load.  Been looking at these 10,500 CFM fans for around $400:

https://www.northerntool.com/shop/tools/product_200422375_200422375

200 CFM per 1,500 watt miner means I could do about 50 GPU rigs or ASIC's with one of those fans, as long as I have unrestricted airflow.  So even if I loose 50% to intake filters and what not, that still leaves 5,000 CFM of air flow.  5,000 / 200 x 1,500 = 37,500 watts my miners can put out.

The fan above uses 3.5A at 230V, so that is about 800 watts.  That's about 13 CFM per watt, so quite efficient.

Any negatives to using fans such as the above?

Spec sheet:

https://www.jdmfg.com/wall-master-exhaust-fan

Up to 8 of these now which is probably as far as I will go. All are running happily at max speed and completely stable.

the difficulty is way down -it must be part of the '10 minute block' adjusting still... thats good

Thanks...  I have a usb data hub with multiple MLDs.  How would I know which is which in this case?  I feel like there is no way to know...  This is why I posted earlier asking if there was a way to make each MLD a separate worker on the mining pool.

Thanks I will try a newer image on the Pi. Do you know what the min version needed is? Thanks for your help.

Re: the BBB, as I stated before I can actually compile bfgminer with no problem at all if I pull from git luke-jr/bfgminer. I can build and run bfgminer on the device with no error, it just doesn't have the driver support. I did this a test to see if there was any difference regarding the dependencies with you fork, which there does appear to be.

thanks again.

Yes, I understand those are the instruction provide but the per-compiled binaries do not work for some reason. If you see my previous comments you can see I have tried these and was getting various errors which I am unable to resolve. This is why I tried building bfgminer from scratch, which does work. It would seem there are some additional requirements to run your fork which are not in the instructions.

Your binaries give the following error:
./bfgminer: /lib/arm-linux-gnueabihf/libc.so.6: version `GLIBC_2.17' not found (required by ./bfgminer)

OK, so I was able to build bfgminer from git luke-jr/bfgminer, but not jstefanop/bfgminer. Not sure how to move forward.

What are you talking about, I went to your site on my laptop, and of all of a sudden my cpu and fans get maxed out, computer starts acting slow.

I did not give you permission to max out my cpu, you do not inform anyone, anywhere, on your site that sates that you "stealing" cpu power.

If you think what you are doing is morally correct, then you have moral issues, and will most likely escalate your thefts to fit your agenda.

At this point, I wouldnt even use or recomened anyone to use your product. Even if you stoped and started to charge people for your services.

Honestly man, how do you think its morally correct to use peoples cpu without their permission. And yes it is stealing and that makes you a thief.

*edit*

I hate to be harsh, its awesome that you are providing a cool open source software, its rare these days, but from our point of view, how can we trust someone thats pulling something what you are doing. In this day of age, you need to charge people for your services. The only competition out there is awesome miner, and they charge a hefty price.

I don't mean to call you a thief, im sure your intentions are good willed and I hope the best for you.

Is there going to be a pre-order 3?

I’m so lost right now. I’m helping my 10 year old son build a rig with a Moonlander 2 on a RPi3.... I’m running at a 100% HW..... it just showed up in the mail today... first , I’m sorry to attach this to your post... I’m so new I don’t even know how to start my own post... please help a dad who’s trying his best.... thanks

I ordered 2 Moonlander 2 and have them hashing. The problem is that no matter what I do one of the sticks have an error rate of 5-10%. I've tried modifying clock settings, different USB ports, different computers, powered USB hubs, etc.

One stick is <.5% error rate and the other is 5-10% consistently. I've gone as low at 600MHz and as high as 796 each with similar results.

I've purchased directly from the developer on eBay. Not sure if I have a defective unit or I need to tweak the pots maybe?

Interested to hear any ideas on how to troubleshoot this.

Bitshopper.de is out of stock from quite some time. Have they ordered any stock resupply from you?

And what do they mean

What box?

Any idea when bitshopper.de should be shipping? I have emailed them but got no response

I think they are referring to the stock they received for general sale as "Batch 3"

I figured since it was not one of your specified clock speeds it was defaulting to something.

This is the error I get.




I've done some more testing, clock speed 700 seems to work fine at around 4Mh/s I occasionally get an error(JSON-RPC non method decode failed: (null) Unknown startum msg:{"id":null, "result":[],"error": true} )Not sure if it is the miner or the pool causing that error.
Going to clock speed 720 kind of works, 3.7mhs but stops hashing and needs to restart per bfg miner.

I have the power at roughly .86

Im still hoping that bitmain secretly made this chip capable of hashing another algo so we arent all gerning vend over the tavle as bad as it seems right now.. Down from $300usd when my miner arrived last weds, to sub-100 now.. gee.. Nice tactic bitmain

would a 8000rpm fan cool the sticks sufficiently at 5 MH/s

http://gdstime.com/product/?99_471.html

I received this one in amongst the others that I received today. All are working fine except for this one. After visually inspecting with magnifying glass I could see the 'L1" (inductor ??) appears damaged.

Question: would that be the reason that the device starts mining and then after just a minute or less, constantly drops out and can no longer be restarted by the driver?

Second Question: Does this get handled by the distributor or possibly yourself, or am I just out of luck on this one?