If you use the stock firmware you will have to try, there is a combination of voltages stored in the EPROM of each hash board, some will match well some won't, if you use custom firmware, you can simply mix and match as they don't care about the voltage readings.

However, why do you want to do that in the first place? unless you are going to sell the other PSU and Control board, or you are running out of space, it's better to keep 1 working board in 1 miner and 2 in the other, the 3 working boards will run a lot cooler sitting next to dead hash boards.

It's all connected together when people are overpaying for mining gears, dying to get their hands on a miner that even when the numbers were good needed 2 years to ROI, it's just a good sign that shit is about to hit the fan, so holding either was just a bad idea, but you are right, if you don't plan on selling your BTC at any point, then getting a gear is less damaging at least at the psychology level.

But do keep in mind that exchanging BTC for a mining gear can be more damaging at times, you still need to ROI the BTC you spent on it, and depending on when you bought it, and for how much, as well as how much it costs to run it and at what point you will be forced to shut it down, you could be in a situation where you were better off just keeping your BTC.

You also need to add the fact that keeping BTC is a lot easier and safer than keeping a miner, so if I have 1 BTC which I can store in a cold wallet, and I have the option to buy a mining gear that will get me 1.1BTC in two years, I will pass and just keep the BTC, in fact, given how risky mining is, to me, if it can't "at least on paper" do me a 2x, I won't touch it.


it's already happening, Bitfarms sold 1,500 like two days ago to fund some credit-backed facility loan, and many of these large miners took loans against both their BTC bags and mining gears, those loans aren't cheap, above 10% interest rate, for the most part, they will have to let go of their BTC bags first, next will be their mining gears, whoever gets liquidated first will benefit the remaining miners.

I wouldn't say it's bad, it's actually great, at least from the small miner's perspective, think of it this way, these large corporate miners formed in the last bull cycle, and they managed to easily raise billions of dollars because everyone involved thought they could make a ton of money, things took a turn for the worse, the investors now are probably hitting their heads against the wall for paying 10k or 15k a gear to Bitmain, even if they manage to come out of this "alive", they won't be doing the same thing again.

If the bull run took 1 more year to finish, everyone would have made a ton of money and in the next cycle you and I won't be able to mine shit, but now, we have better chances.

 

Everything you mentioned can be done using AwesomeMiner, it's the best tool for this job, hands down.

You will, of course, have to use Vnish firmware to use most of the functions, AwesomeMiner has its own distribution of Vnish and you don't have to buy AwesomeMiner license if you use it which is a plus.

With AM you can set your target profile hashrate which gets activated based on many factors, like time of the day, temps of the miner, number of shares found, profitability, and a lot more, if you don't want to use the already configured profiles you can just change the frequency and/or voltage.

The way it works is like this, you have what's called triggers and actions, the former watches for something to happen in order to activate the latter, there are many ready-to-use triggers but you can even write your own c# script to get inputs from your solar inverter and adjust the hashrate accordingly.

Gear prices have dropped by a lot, and probability in fiat is 60% lower than it was back in February, it makes sense for gear prices to fall, a gear that used to cost 15k is now selling for 5k and below, they will still drop, it's just a matter of time, gear prices take some time to react to profitability drop, most of the big guys mine with S19 or the equivalent, so something in the 30-35w/th range.

at current prices, I don't see any reason for them to shut down or to stop deploying.

Let's run some simple math and try to be as realistic as possible.

Let's pretend all the big guys that make up the majority of the hashrate mine at 6 cents (3-4 cents for power, the rest for maintenance, employees, rent, etc), now since many of them will be getting the S19 XP while some of their gears is still the 17 series or the equivalent, let's use something in the middle of both and that would be 35w/th

So let's work with 100th for simplicity.

100th consumes 84kWh, at 6 cents that is  $5 a day.

let's also assume that they will only stop hashing if they get to a negative number,  or let's be generous and assume they will stop when their average 100th makes less than 50 cents.


1st scenario, difficulty unchanged:

BTC at 13k > they still make $ a 5.52$ - 5 = 0.52$ a day
BTC at 11.75k  > they mine at a loss.


2nd the scenario, difficulty changes, price unchanged.

Diffuclty at 44t  >5.52$ - 5 = 0.52$ a day (47% increase from the current figures)
Difficulty at 49t they mine at a loss.


At current figures, their heads are still above the water making $8 and paying $5 and thus netting $3 per 100th, but with that small income, it's pretty hard to expand, and even assuming the price will stop dropping (which does not seem to be the case) they can only endure about a 40% increase in difficulty, so that's only 100EH more, in other words, less than a million gears, there are hundreds of thousands in pre-orders waiting to be sent to the U.S, every dollar BTC loses makes the room for new gears a lot smaller, there might come a point where some gears are already losing money before arriving at their locations.

Meanwhile, with the summer heat, I saw someone talking about some farms shutting down/ underclock in places like Texas, which could help bring the difficulty down a bit, at least a long side with many of the small miners who are shutting down because they pay a lot more than 6 cents and don't actually have a 30-35w/th.

My long-long term view on those large corporate miners is that most of them will be screwed, it's very unlikely that we can recover before Q3-Q4 of next year, we may stop dropping but we won't be putting any crazy high prices, and even after we recover, the next thing coming will be the halving, so difficult times ahead, not just for them, for everyone who is involved in mining, especially those who bought the top, like 15k per miner that now makes them a 100$ a month, stay strong fellow miners.

This thread now sits at the top of this sub-board, reading through the comments I found Biffa's answers, it's fascinating how mining earnings can change so much in a very short time, only 4 months had passed since this post and the same hashrate now earns you only 0.00012239 or 2.3$, that's a 60% loss in just about 4 months, imagine OP or anyone for that matter had plans that were built on a such a profit only to see earnings drop by that much.

To most of us here, it's nothing new, we lived through a few bear markets before, but those who started mining 2021 must be feeling really bad, I mean those who paid 15k for S19 are probably not even halfway to ROI, that should serve as a great lesson for the next cycle, do not buy expensive gears after BTC makes new ATHs, please don't.

I assume you don't have any previous experience with programming, you can't just jump into this without knowing the basics at least, you need to learn how to use a proper compiler and debugger, that way you get to know that exact line that caused the issue, you can't just execute the program and keep guessing, even if you get lucky with fixing this issue you will face more issues.

100a on 25mm2 cable is the max, and it won't be able to run 24/7 without a voltage drop for some degree, not sure what type of fuse do you have, but you are going to need to install smaller breakers to be on the safe side, the total amp you can draw from that 25mm2 cable would be 80amp so do work with that number.

Also, you might have 3 phases at the main panel, not sure about the U.K but here most home panels have 3 phase set ups but the electric company will often run 4 wires (3 live and 1 natural ) but only plug 1 and leave 2 for future expansion purposes, if you are likey, you might find just that, if not just work with the 80amps you have.

Miners combined make a tiny portion of the trading volume that btc has, the selling pressure caused by miners is not that strong anymore.

Also i would not say that most miners are mining at a loss, it is more likely the other way around, proof is, difficulty keeps hitting a new ATH every month despite the 70% price drop, large corporate miners in the U.S have access to very cheap power and access to a lot of money, they are unlikely going to stop, it is the small miners who bought overpriced gears and mine at 15 cents per kWh that are getting screwed in this mess.

The drop happened faster than i thought, so I am inclined to believe the recovery may take a bit longer, it is important to admit to the fact that the end of a bear market is not just a price target we hit and bounce of off, the sideways that can take months is even more difficult to watch.

As mentioned above by Welsh, we can not ignore the general macro, we could break below levels that we did not break below before, but then for someone who is trying to invest in bitcoin, what would it take for you to buy? It is not like you are putin's best friend to know when the war is about over, you do not date one of the decision makers in the U.S, you can not predict shit about all those factors, and once you and I are informed about the general health of the economy it will be too late to buy crypto.

So really, does not matter from here on if we dip any further, current prices are just good, 15k is better, 10k is even better, one should be prepared to accumulate at any given price, big or small it does not matter, what matter is, buying a solid asset at 70% off or more from ATH was never a bad idea. 

Don't these evap coolers increase humidity? ok they probably do, but isn't too bad? do keep before and after humidity figures? I mine in a very hot place, but in the winter humidity goes up a little and it damaged way more gears for me than heat ever did, thank God we managed to control it later but still, humidity is a worse enemy than heat.


Those are shit gears according to the general public, people have reported a very high failure rate for those gears, which is probably why they sell for a lot cheaper.

Could not identify which line throws that error in a debug mode or something? I am not familiar with Ckpool source code but this error seems to be related to dynamic memory allocation, look for a declaration of a char called buffer/buf which is used in something like realloc(), and try to increase the size of that char and see if it makes any difference.

هدا يعتبر اسوء استخدام لنظام الثقة في المنتدى وقد يعرضك للحصول على تقيمات سلبية من اعضاء الثقة الافتراضية, تقيماتك السلبية لاقيمة لها ان لم تكن مدعومة من الاعضاء اصحاب الثقة الافتراضية,وللوصول لتلك القائمة يجب ان يكون استخدامك للنظام جيد جدا على اقل تقدير, اما بطريقة استخدامك هدا فانت تضمن لحسابك هدا وحساباتك الاخرى او حسابات اصدقاءك (الامر لايهم في هده المسئلة) ان لا تصل الى تلك القائمة ابدا, بل العكس حصولك على تقيمات سلبية لسوء استخدامك للنظام واضافتك في قائمة غير الموثوق بتقيماتهم يجل كل التقيمات التي تضعها اقل قيمة مما هي عليه.




كما ذكرت للعضو الاخر كل تقيماته لاقيمة له, الا في حال كان هدا العضو موجود في DT ولو حصل هدا فسوق اقوم بوضع تقيم مضاد لتقيمه والعمل على ازالته من القائمة, يمكن ان تنظر الى حسابي فهوا مليء بالتقميات السلبية التي لا تحمل اي قيمة وهي لاتوثر على حسابي باي شكل من الاشكال ولم اقم بترك تقيمات سلبية على حساباتهم نظرا لان ذلك يعتبر "انتقام" وهدا ايضا يعتبر تصرف خاطيء حسب اجماع اعضاء المنتدى, افضل حل مع تلك التقيمات هوا التجاهل.


اما بخصوص ترك تقيمات سلبية على حسابات ذلك الشخص فقط لانه يمتلك اكتر من حساب ايضا يعتبر ضد مايتنفق عليه اعضاء التقة الافتراضية في المنتدى, لان امتلاك اكثر من حساب ليس ضد القوانين اصلا, يمكن ترك تقيم محايد او سلبي في حال كان الشخص قد قام بالنصب على احد الاعضاء بحساب اخر ولكن لفعل هدا يجب ان يكون الارتباط بين الحسابين واضح جدا, كون ان اكتر من حساب قامو بكتابة تقيم سلبي في حسابك لايجعل من هدا دليل قوي على ارتباطهم, لذلك وكونك عضو قديم  ومعروف وموثوق في القسم العربي انصحك بتجاهل التعليقات السلبية والمضي قدما, وان لا يكون هدا الهجوم عليك سبب في توقفك عن فضح النصابين والمتحالين واعلم انه ان لم يقم اي شخص بمحارتكم يعني انك لاتقوم بمحاربة النصابين.

That's going to be A LOT of work, and don't get me wrong, it will be extremely difficult for a top-notch programmer, let alone someone who is still learning, but to give you a sort of a summary of what you need to write, it will be as follows.


1- You will need to write or modify an existing mining software/driver to control the S9, that will be either Cgminer or BraiinOS.
2- You will need to run your own bitcoin node software to keep up to date with the blockchain and to propagate any blocks you might find

For that, you will need to be well connected to the other major mining pools, which requires a good server/s and some good amount of money.

Keep in mind that the above open-source codes is plug and play, you will need to do a lot of modification and testing, and in the end, you will only know if your code can actually find a block after it finds one, so you could be mining forever with a piece of software that isn't capable of finding a block in the first place, but it will be a great learning experience for sure.

The answer is in these 3 lines which I copied from your kernel log, your miner is T17 which has 30 chips of on each hashboard, they work in series which means one missing chip will stop the whole hash board, your chain 0 and 1 both have bad chips, chain 0 loses the signal on the 18th chip, chain 1 doesn't sense any chip at all, this is a very common issue with all the 17 series, most often caused by bad contact between the chip and the board itself, fixing it isn't an easy job and needs a good set of skills and hardware.

if you don't have those and don't want to send it for repair, try the freezer trick, seal the two hashboard in a plastic bag, drop them in the freezer for 2 days, not sure what does that exactly do to these hash boards, but it does work sometimes if you are lucky enough.

I do not think it is that easy with the s17 series PSUs, you only get 12v on the wire that powers the control board, the other side of the psu that feeds the busbar going into the hash boards only kicks when there is power draw from the hash board, so the simple testing procedure that works with other PSUs might be misleading with these psus.

My guess is whoever owns the current payout address will be able to recover the account, but again, every pool would operate in a different way, your question is specific to slush pool and thus I think you should post in their own thread to get a better answer

Ya likely, but could be a few bad chips as well, also judging by the domain voltage error, could it be that he mixed and matched some hash boards? Can you get him to flash vnish firmware like awosomeminer or asic.to?

This custom firmware eliminates a few possible causes and helps you narrow down the issue to one or two things.

How do you know Autotuning is off? just disabling it on the profile page, doesn't mean it will stop, anyway, go to Miner Configuration > Mining profiles and scroll down, there will be another log, please post that.

I also don't think you need to worry about the health of the hash boards, they read just fine

Post two different posts, cut the kernel in half, third or even quarter as needed, you didn't post the first half of the kernel log which is very important, but judging by the other half you posted, it seems that the miner might have a bad PSU, it could be dead, or the buyer's voltage is just way too low, you need to ask him for a proof that his voltage his 220v or even better, just ask him what voltage he runs them on.

Transmission and distribution of electricity are very complex and very, very costly, just because you have excessive power at point A -- doesn't mean you can't be lacking the necessary power at point B, you can solve this problem if you throw enough money at it, but then transferring power will come at a great cost of money + a good amount of it will be lost in the transmission process, the person/s receiving it need to be able to afford all that extra cost added, or else, it doesn't make any sense to invest billions of dollars to send that power to the other side of the country.

Kengen isn't 100% owned by the government, so the shareholders will probably care more about how much money they can make than supplying the poor with electricity (the government too probably doesn't care), so it really makes no difference if 30% of the people have no electricity or even 70% of them, miners can bring their containers right next to the power source which means no Step-Up/Down transformers, no expensive transmission towers, which means saving billions of dollars.

Of course, I am not arguing if it's moral to sell electricity to foreign bitcoin miners while 30% of your own people are in the dark, freezing to death in winter and melting in the summer heat, of course, it's inhuman at best, but it seems like those 30% are poor and live somewhere in the countryside, so even if the company would transfer the power there, they will either not afford to pay for it, or not use even half of it, which gives the shareholders of the company the incentive to find other clients, it's pretty damn sad to see that some people in 2022 still don't have electricity at home, but it's what it is.