What is most disturbing is that said miner is being paid a very large percentage of every block reward and it yet seems that to-date they have not done any valid work. Doesn't matter how bad their luck is, given their size if the miner farm was running correctly statistically they would have several hundred blocks under their belt by now.

So far they have found zero blocks and yet the Slush operators don't care? Personalty I'd boot them until the situation is corrected! Kano had to ban Nicehash users when a similar situation was found with its work results.

Have you at least contacted them and opened a support ticket?
Whatsminer firmware page https://whatsminer.net/whatsminer-latest-firmware/

Hmm, wonder if the 400PH miner (ypgmc) w/no block to-date are running Ebang E10's? ref https://bitcointalk.org/index.php?topic=789369.msg41681753#msg41681753 for one pool operators opinion of the E10's. For comparison, a nearly equally large miner (bf-canada) that also started in late 2017 has found 651 blocks per the Acclaim Stats page...

Good primer, Merit given

One odd point in the cost equation. You end it with: =Cost per day to operate (ideally more than the FIAT value of BTC mined). That rather sounds like cost to run is more than value of coin mined.

Shouldn't that read 'ideally less than the value of BTC mined' as in you earn more than the cost to run?

Well, all I can say is email them and ask.
In my case Nick was nice enough to send me 2 fans gratis, no doubt at least partly from me getting many k$ of miners and PSU's from them ever since they were picked by Canaan to be a distributor. The older 721's & most 741 miners were bought directly from Canaan and as such Canaan had to do the fan replacement. Painless but took touch over a week. The spares cover me for that next time.

Again, gotta say -- Love these folks!

As an FYI the same fan is used on all the miners from 721 on up to 841 (so far). Hell, might even be the same one an A6 uses?

415v line is along ways from 480. No matter what a step down xmfr is needed so they might as well do it right.

^^ ditto.
Just place the delta/wye step down xmfrs at the end of each aisle along with their required distribution breaker panels and feed each xmfr with a run from the 480V main panel feeding the delta side. Makes it nice and safe/easy to work on each aisle plus saves on wire cost by keeping the 208v runs needing really thick wires that run only the length of the aisles. Also since the miners are now directly fed from across the phases the is no need for a Neutral wire for either the 480v side nor the wye 208v side (but ground does connect to the center of the wye).

One trick to do is set the taps on the 480/208V transformers to produce higher voltage. Usually you can set up to around 215-220v and that give a little extra margin to work with when the line dips.

If you mean the RasPi PSU wall warts, they need to be rated for at least 2.5A.

When you say 'reboot' are you soft booting (not cycling the power off/on) just the miners, restarting cgminer, or soft booting the RasPi?

To Nick @ Blokforge, got the fans you sent and thanks. Having spares on-hand gives nice warm and fuzzy peace of mind for next time a fan goes out.


To all, Blokforge does have fans available for spares. If not listed yet just send them an email and they will take care of you. Warranty replacement is never an issue but it *does* take a little time (few days) so having a spare to pop in before the replacement arrives is always handy

Or you could just buy a temp controller to do what you want, such as found here https://www.automationdirect.com/adc/Shopping/Catalog/Process_Control_-a-_Measurement/Temperature_-z-_Process_Controllers

Bigger thing in the repair guide deals with the API logs and how to read them -- that gives detailed information as to PSU voltages, Vcore, temps, speeds, AUC dongle temps & current draw, etc. Pull a copy of the logs when they are running right and another copy when they act up then compare the two.

edit: and DO NOT post dupes of the same query in other sections - mods will delete them...
If you insist on dupes at least post them in the right areas eg Mining Support and preferably under that Avalon repair thread so everyone can see the question and solution without searching all over the Forum... Software area sure ain't it...

For a start, read through the Avalon troubleshooting guide pinned to the top of the Support section. Bet ya find the answers there...

Something must be seriously wrong with the setup because I've found the Avalons to be rock-solid.

^^ As seen at the very top of the Forum webpages right under your avatar:
https://bitcoin.org/en/download

That is still no reason for them to call for forking BTC by creating another PoW algo. Once the photonic chip manufacturing processes are viable then the logic pathways behind sha256d can just as easily be implemented in optical logic as it is in current chips.

You want to break Bitmain's dominance of BTC -- build a better BTC miner than they do. My take on it is that they just want to make another coin and as is the case with all new alts they're hoping that it could supplant BTC.

At this time still pure fundraising PR as on-chip photonics is still a long ways out. As expected they hold up the Evil Bitmain as their reason, despite the fact that there are several sha256d miner makers with the #2 being Canaan with their Avalon series.

More to the point regarding this area, they are talking about making an alternative to the sha256 PoW algo aka BTC and as such this becomes an altcoin discussion and should be moved to the altcoin areas.

Close but no cigar. Look for the next size down in the family. The ones you want are good for either 5 or 8a per-circuit - not 23a.

edit: These are the ones https://www.molex.com/molex/products/datasheet.jsp?part=active/0455580003_PCB_HEADERS.xml
DigiKey, Mouser, Allied. etc should carry them. If possible get the ones with either silver or gold plating to handle max current.

If you mean the hash board power connectors, those are male (pins) - not female (sockets). Made by Molex and I believe are their Mini-fit series. PM Lightfoot for hard info as he repairs boards all the time.

Until someone has one of these miners and goes through the code, unknown. That possible re-direction is what folks were worried about with the s7's.

Does no one have a problem with the miners phoning home? From the sales copy:


As was the case with Bitmain's s7 remote shutdown (Antbleed?) had it ever been activated it sounds like the miners report home either at boot or periodically when running. The anti-theft measures means GMO can brick the miners at will. Thing is, I'd assume the miners need to phone home and get a permission key before they will run.

I for one will never allow a miner or any other device to do that. Even Bitmain's s7 allowed phone-home (had it ever been activated) to be disabled.