Doorstopper would fit better, they can do exactly that, I have used them for such purpose when i had nobody to hold the door while i carry stuff inside/,outside.

I think the scrap value for S9 was 10-15% in China 2-3 years ago, now with all metals increasing cost, it should be 20$ or so,  so ya, worst case.

Guessing difficulty has been only getting harder, it's even worse nowadays since we are approaching the halving, you just can't tell what people have in mind, but a 5% is a whole lot of gears and power, I still find it hard to believe that it was not a fluke which would correct itself this epoch.

Mind you, even post halving we would still see unrealistic changes like we did the last halving, it would take a few epochs for things to settle down.

The one thing certain is that anybody paying above 5-6 cents and doesn't have S19 or better, is going to face some serious issues.

Too much details in the comments but the most important thing and probably the only thing that really matters would be your buy back prices.

It does not matter if you have 2 or 2000 panels, you can't mine Bitcoin off-grid, so you will always have to buy power from the grid, so how much would your electric provider pay you for it and how much they would sell it back for?

If electricity is too complicated for you, think of it as extracting water from your land, you have a pump that only works for 4-5 hours a day, doesn't matter how much water you get, you can't store any of it to use it for the remaining 19-20 hours, so you extract more than you use, sell it to the water company, and then buy it back when your pump is not working.

It is worth mentioning that usually the issue is in a single chip or just a few of them, so all these S17 floating around for sale have already been fixed and equipped with the single block heatsink, this means, they have a lower failure rate than the brand new ones, not because of the new heatsink, but rather the fact that they have fixed them and used better solder.

They would fit perfectly, the surface of the chip is perfectly flat, and you put a perfectly plat plate on them -- you get an even contact and perfect heat transfer, so these plates do work, but if your question is "will this solve the main problem with all the 17 series?" then the answer is NO.

As I explained before, the issues of bad soldering between the chips and the hashboard itself can't be solved by using this signal large heatsink, it's not very common for heatsinks to fall apart, if that was the main issue then this design would do the trick, but it's not.

It would be easier to remove a single large plate when you need to fix something underneath it, a lot easier than having to heat and remove a dozen small chips, it may provide slightly better cooling than the stock design, but it certainly isn't going to fix the major problem which is the most common, in my honest opinion the person who invented this large heatsink is a con artist, he knew that many people thought the issue was always in the heatsinks, so "pretend" that you have fixed the problem so you can make a ton of money by giving false hope to miners.

My general advice when it comes to these trash miners is -- don't buy them.

المحتوى العربي محدود جدا سواء من حيث العدد او المضمون, طبعا قد يرا البعض هدا على انه عيب في القسم العربي الا اني اراه شي ايجابي جدا, فمثلا لو ركزنا على القسم الرئيسي وقسم المبتدئين سنجد ان 90% في المئة من المواضيع والتعليقات هادفة وجدية ومتعلقة بالبتكوين, مواضيع القمار لا تعتبر مرتبطة بالكريبتو باي شكل من الاشكال فحتى ان كانت وسائل الدفع للكازينو او الربح منه بالكريبتو فهدا لا يعني انها تتعلق بالبتكوين او الكريبتو, يوجد الاف الخدمات والمنتجات التي يمكن شرائها بالكريبتو ونحن هنا لا نناقشها, والامر لايختلف كثيرا بالنسبة للقمار.

اضف على ذلك ماتقدم به الاخوة الزملاء ان مواضيع القمار لن تجد رواجا هنا نظرا لان اغلبنا لانمارسها ولا نهتم بها اما لاسباب دينية او غيرها, شخصيا لا يهمني القمار ولا احب حتى ان اقراء عنه اي شي, فما بالك بكتابة مواضيع عنه.

Ya, I used stock settings as a reference, it would take a while for mods to work well on the Antminer S21 to figure out how low can the w/t go, it could be 15w or anything in that range unless they are already underclocked by Bitmain which doesn't make sense, but my guess is -- it would be a similar drop that S17 had percentage-wise.

As for the bull trap scenario -- it's possible, BTC likes to do things differently every cycle, this is the first cycle where we hit a new ATH before the halving, the majority of people were waiting for the halving to happen and then bull, many other people including myself thought that this time would be different in a negative way, i.e, it would not moon in the same halving year but rather middle or late next year, but what do we know? BTC does what BTC wants to do.

Well actually going as far back as 4-5 years then it's 2019 era, the most efficient publicly available mining gear at the time was Antminer S17 which did 56th for 2500w, this puts it 44.6W/th, fast-forward to today, we got Antminer S21 which does 200th for 3500W, which is 17.5th, that's a little over 60% improvement in efficiency which is HUGE, one would also assume that mining gears manufacturers have already acquired more experience and skills to make the overall production cost lower.

We may not get another 60% improvement in the coming 4 to 5 years, at least not on a single-chip level, but if they can make them cheap enough, they can always stack more chips and run them at lower speeds to achieve better efficiency.

I am really sad to hear this, i know you have invested too much time and effort in that farm, alongside with buysolar, it sucks to stop mining, been there, i know it feels like shit.

I would sell them if I could, wait for another chance to present itself, the longer you keep them the less they are worth in BTC, not an easy move I know -- but good things don't last forever.

With that said, patience is key, I had a deal over for 30KW, was sitting there doing nothing for months, then a 1MW deal came my way, you just have to wait, but while you wait, try to get the best deal for the gears you have, you can always re-buy them cheaper when the time comes.

Energy production is a complex subject. It's neither cheap nor easy. The only reason why electric companies can offer "cheap" rates is because they produce energy in bulk. Setting aside all taxes and other unrelated costs, you need to produce a significant amount of energy just to break even. It doesn't matter how you produce the energy—whether from the sun or wind—you can only generate a limited amount at a given time. For the majority of the day, you will need to rely on power from the grid.

Storing electricity is more expensive than producing it. Battery technology is lagging, so you can't simply produce 240 kWh and use it throughout the entire 24-hour period. If you require 240 kWh per day, you must assume it's only viable for 4-5 hours, meaning you'll need to sell it to the company and then repurchase it.

If the company sells you 1 kWh for 10 cents and buys yours for 5 cents, then you'll need to do some calculations.

For example, if you require 100 kWh every hour during the 4 hours when your solar/wind system is producing energy, you need to generate 40 kWh for your use and 400 kWh to sell to the grid. At 5 cents per kWh, you have a daily credit of 400 * 0.05 = $20.

Then, when your solar panels or wind turbines aren't producing anything for the remaining 20 hours, you'll need to purchase 200 kWh at 10 cents, costing you $20. In other words, you break even; you don't owe the company anything.

However, this means you must invest in a system capable of producing 5 times your actual needs. That's a significant amount of money to invest. Of course, there could be other incentives for running solar, such as tax benefits. If your country/state encourages on-grid solar, they may buy from you at 4 cents and sell to you at 5 cents during the night (not sure if anybody does that, just speculating). It all depends on your location. But in general, building your own energy infrastructure is complicated and expensive.

DH = Average error rate, it shouldn't be more than 1.5%, max 2%, it has been a while since I run any Avalon (never liked them, didn't have good luck with them, maybe because I bought them used/abused, but ya) IIRC the GHSavg which is the hourly rate will show the actual hashrate the unit runs at after taking into the account the DH, DH and HW are usually caused by incorrect voltage/frequency settings, too high or too low would increase DH and HW.

Most important however would be your pool hashrate and the reject rate at the pool, if your miners are expected to run at 100th and you get anything above 97~th with say 1-2% rejection rate on the pool, ignore everything else you see on the miner GUI, if that isn't the case -- you got a problem, start by lowering the frequency.

Fine so you want to assume that heat loss is 0, and delta T is 14, here is the math.

air density at 3c = 1.223kg/m
1.223*900*1005 = 1,106,203 * delta t of

15,486,849 joules > the heat required to raise the temps inside 900m3  by 14 degrees Celsius.

T = Q/W  

Example 1:

for 1*antminer S21 =

T = 15,486,849J/3500W/60s = 73 mins

Example 2:

for 2*antminers

T = 15,486,849/3500*2/60 = 146 mins

If you really want to assume no heat loss at all and up to 1 day to reach that delta t of 14, then you just use Q and T and solve for W
Since  T = Q/W then W = Q / T

Q = 15,486,849J > We got it from the above equation
 T = 24*60*60 = 86400 > Converting 1 day to seconds
W = 15,486,849/86400 = 179W

That means even 179W is good enough to heat a 900m3 area in 24 hours with 0% heat loss and perfect conditions, obviously, since there is no way that heat won't escape from whatever walls you are building, this never will never do it.

But if you really are okay with waiting a whole day to bring that temp up, then I think with good insulation, you can probably do well with just 5-10KW, your main issue now would be to discover how much heat loss you are going to encounter, if the place was already built, you could make a cheap test like Phil suggested, you get a 3KW heater put it there for 24hours while monitoring the temps, whatever that gets you is what 1*S19 would do, doesn't matter the source of heat, you just focus on the KW ratings and get an idea of what 3kw, 6kw, 9kw would do to your greenhouse if you get 9KW heater and it fits just fine, then 9KW worth of miners would do the exact same thing, air doesn't care how you generate that heat, heat is energy after all.

If the average person outputs 100w of heat, you put 90 lazy people inside the greenhouse and they would raise the room temp exactly the same as 3kw miners or 3kw heaters would.

There can be no study that is remotely accurate when it comes to mining, these numbers floating around on google and elsewhere are only good for a research paper to graduate  from your IT college or so, it serves no real-world purpose beyond that, nobody knows where and how the hashrare is being generated, it is all guesswork, they take a few miners and ask them what machines do they use? How much they pay for power? Then take that 10-20% minotiry and assume everyone uses the same gears, pay the same power bill, have the same CapEx and OpEx, same debt, same techs, whereby in reality every single miner is different.

So when someone says, it costs x to mine Bitcoin, or the total power consumption for mining BTC is x, all they do is speculate, some do educated guessing which may represnt some part of the truth, the rest are just bullshiting.

Miners' depreciation is directly related to the amount of BTC it can mine, and since difficulty is an ever increasing function, minings gears lose value every single day, in 2023 alone difficulty grew by more than 90%, that means every single depreciated by more than 90% throughout 2023.

Still, this isn't counting the failure rate that would drastically increase when you do those periodical running rounds.

ROI in respect to BTC is the most crucial aspect of case studying a mining investment, while turning your gears off at certain times lowers your power bill, it lowers your income as well, in other words, ignroing everything I mentioned, if highest electrify price at your place is not low enough for you to generate net income, then this model won't work, if the highest price is still good enough, then why shutdown?

Not saying your math is wrong, it is correct for someone to compete against themselves with no other external variables, but given that this isn't the case, you simply can't compete if you are forced to shut down for periods of time because the power bill exceeds your production capacity, unless there an abnormal case where the cost for 1/3 day is 20 cents/kWh vs  2 cents for 2/3 of the day.

The better model which has been tested for years in China, is seasonal mining, where miners ship their gears to the otherside of the country for 5 months to get close to free power, then go back to the region that has the cheapest electricty rate.

As for the all the numbers in the study you posted, they could be off by anything from small to huge, just like with all these similar studies, they contain a lot of guesswork, you just look at their methodology and you will understand why, using a small sample of avaible data and reflecting that on the entire network is simply inaccurate.

Except that mining difficulty is never 'relatively static'. In the past 12 months, it increased from 42T to 81T, resulting in an average monthly increase of 3.25T. A 2-3% increase every epoch is now considered the norm. It doesn't matter how large the current hashrate is—investors continually pour money into mining gears and infrastructure. On the 16th of February difficulty adjustment, there was an 8% increase. The hashrate was roughly 500EH at that time.

To put this into perspective, an 8% increase translates to 40Exahash. Assuming the latest generation miners capable of 200Th/s, this equates to 200,000 mining gears. While difficulty isn't a perfect representation of actual hashrate due to variance, even a conservative increase of 4% would mean an addition of 500 million dollars' worth of equipment and 350MW of power in less than 13 days.

As for mining off-on, it simply doesn't work. You're not only competing with difficulty but also with technological advancements. These factors continuously depreciate the value of mining gears, irrespective of the price charts. As a miner, you're facing constant depreciation, especially as halving events approach.

Moreover, mining gears are engineered to function optimally when run at a steady pace. Turning miners off and on causes sudden temperature changes that can negatively impact chip lifespan, solder integrity between the chips and PCB, or chips and heatsinks.

While this may not be convincing to many miners, having worked extensively with mining gears, I can assure you that 90% of failures occur during boot. Miners rarely fail when running steadily. Large mining firms may negotiate shutdowns with the electric companies, but these requests come at a hefty price. For instance, Riot, a single miner, received over $30 million when asked to shut down during a Texas heatwave IIRC.

There are no tricks in mining. Sourcing cheap competitive power is essential. Some large U.S. miners enjoy rates below 3 cents/kWh (Not even sure how they do it), you can't compete with these folks by having a 20% discount on your expensive power bill for 3 hours while the sun is burning hot.

It's 68k now, but ya, honestly, nothing is going to be good enough to make post halving even close to 13 cents/th profit, the best we could hope for is for the price to keep climbing up slowly and hopefully a 20-30 difficulty drop 1-2 months after the halving, 11 cents would be like a dream after the halving, I will be more than happy with 10 cents post halving but well prepared for 5-6 cents /th.

As for the current difficulty status, it seems like we are still lagging.


Goes against my expectations but I am happier about being wrong than right.

العنواين التي تحوي على رصيد متاحة للجميع ويمكن ايجاد كل شي على البلوكتشين, مالفائدة من نشر تلك الملفات؟ اما بخصوص اختلاف انواع العنواين في منشورك التاني, فالمفتاح الخاص واحد, يمكنك بنفس البرايفت كي انشاء عنوانين Lagacy and Segwit اما عن سبب التغير فهو ليس تغير بل تطوير وهي في الواقع حزمة من التطويرات التي تمت على هيئة softfork الغرض الاساسي منها زيادة حجم البلوك او بالاحرى زيادة عدد المعاملات داخل البلوك الواحد.

يمكنك البحث عن Segregated Witness لفهم القصة كاملة, وان كان لديك اي سؤال معين تفضل بطرحه.

The difference between 900m3 and 9000m3 is 900%, and given that the topic is heat/cooling every meter matters.



Selling wood in square meters is just plain dumb lol, especially firewood which doesn't have the same thickness most of the time, if it was some MDF sheets that would make sense, where I live, unless the thickness is identified, wood is always sold in cubic units, but ya, the world is crazy.


You need to calculate how many KW of heat you need, this isn't something we can help you with, we can only speculate, we don't know what the outside temperature is and what type of insulation your room/greenhouse it makes a world difference.

I will give you a very simple example, the house I live in is built of Hollow concrete block, no drywalls and it's on the top floor, if I turn off my AC for a few hours, the room temp will be almost exactly equal to the outside temp, it loses heat very fast and in order to keep the house warm during winter and cool during summer, I need a large AC for the living room and the 2 rooms next to it, and another AC in the bedroom that runs most of the day too.

The other week I went to a friend's remote/country house, he built it with concrete blocks and then covered it with thick 10-15cm sandwich panels, it was 8-10c outside, the room temp was 24c,  he turned off the heater, 4-5 hours later temps were still 22c, hadn't I been feeling pretty warm I'd think his thermometer is broken, if I turn the AC off in my house off for 4 hours it would be 8-10c inside, I am not kidding.

So you see, insulation is very important, good vs bad insulation could mean 10KW is good vs 50KW is not enough so what's it going to be for your case?

If you want to do this right you will get an accurate number of the required heat in your greenhouse, only then you can run the math.

Say it's 10kw of heat that you need, you take the cost of miners vs the cost of other heaters, the cost of running them vs running other heaters, then you add the miner's income to the equation just like I did above then you get an ROI estimate and you would be able to tell if it makes economical sense to spend more on miners.

One thing you need to keep in mind is that miners don't like to be turned off and on like a thermostat, they like steady state, so if your room gets too hot, you don't want to turn them off, you would want to direct the heat outside, doing this efficiently would add more to the overall cost of running miners, for the normal heater it's a thermostat you set, it can be turned on-off dozen times a day without a problem.

Another factor you need to keep in mind is how fast you need to warm the place after a power outage, if you have perfect insulation and can wait for the heat to slowly accumulate you may do with just 10KW, if it's okay to wait for say 5 hours for the place to reach the desired temp, now if you need the place to be warm in 30 mins it means you need 10 times more heat, if this was a regular house were you could put on a blanket for 2 hours till your S21 makes your house warm -- it would have been easy, but you say it's a business, probably growing plants or whatever people do with greenhouses, everything about it different than heating a regular house.

We did explain the overall logic on how to go about this, but without all the details I mentioned above, we all are just "guessing".


You are converting seconds to days without going to minutes

187.941.096.000J / 500000W = 375882 seconds that would be 6,264.7 minutes or  104 hours which is just about 4 days not 261 days.

Water as you already know has a higher heat capacity than air it's 4186 J/kg°C vs 1005J/kg°C, but I think you are reading the labels wrong, I don't know what a water boiler labels mean, we don't use them hear, but I suppose whatever the rating is -- it's for the output capacity of the boiler, i.e it gives you 500KW worth of heat, you use it to heat air or water is a different subject, so you shouldn't be looking at things this way, also why the hell would you use 9000m3 of water in your calcs, that's a lot of water to be boiling. , you want to stick to 900m3 of air since that is what you need to heat.


Yes that's right, it's the correct formula, obviously, this assumes no heat loss and even distribution of heat, which both don't happen in a real world sncerio, there will always be heat escaping the room depending on the insulation and the outside temp, and even heat distribution in such volume is difficult, so if the room temp was even at 20c across the whole room, and assuming no heat loss, it would be maybe only 1 degree hotter on one side of the room, and 10 degrees hotter on another spot, but ya, the average would be 5c.


So now that you say yours is 900m3 and not 9000m3, then using your friend math of 34w/m3 it means you will need 30,600KW worth of heat, the number seems pretty reasonable to me, say your outside temp at winter is 5c and you need to be 25c, with delta t of 20c and 30KW, it would take roughly half an hour to heat the place by 20c, with heat loss and all the imperfection and the fact that you don't want to be running the boiler or whatever the source of heat 24/7 then I see 30KW is pretty reasonable from your guy assuming it's really cold outside (which you have not mentioned anything about up to this point)

With miners, since they are designed to run 24/7 you may get away with less power, assuming no power outages and no heat loss alongside some good insulation, I honestly think 10KW would do you just fine for 900m3 area, probably even less.


 

I don't fee comfortable clicking on random links, and I am sure many other members are probably the same, the forum is feature-rich, you can post images, kernel logs and many other content where the viewer can easily and safely view them, if your account doesn't let you post images you can just put URLs to them.

Use this website https://www.talkimg.com/ to upload images, paste the image URL.

And to post any logs you can use the code tag "dash icon above the smileys"

Example:


You can quote my post to learn how to use the code tag, it's pretty straightforward.

Luck resets, it has no memory, you could be running for 1000 rounds with no blocks, and then hit 3 consecutive blocks, I know many people don't understand this or find it difficult to understand how past results have no effect whatsoever on the future results as far as mining is concerned, it's really like rolling a dice, if you get 1 in the first time, the chances of getting 6 or 1 in the next round will remain 1/6.

When you mine, every share you submit has the exact same chance of hitting a block, it's just the more you submit the more likely you get that one share that would hit a block, alas, I understand why it's hard to understand but I still try to explain it in the best way I can.