I'm not really looking for ROI. I feel it's too pricey to reach enough h/s to achieve that. I'm just doing it for fun and to support the currencies.
Nice to see people mining just to support bitcoin. Your hardware will not be that much addition to your electric bill assuming the PC you are using is always on and you are not CPU or GPU mining with it. Your ASIC miners are adding around $8.75 to your bill a month. |
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Any switched managed PDU can do this. I use Triplite, APC or ServerTech but there are many makers out there. I also heard good things about this but never used it. http://www.digital-loggers.com/lpc.htmlEDIT: Spelling Corrections |
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Too bad these are 220W.  You can use the dryer outlet or the stove outlet if you are not using those currently. 110V-120V is just not enough to run large PSU's, the required amperage would be crazy. |
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What are people offering that is ridiculous? $800-$900 is a fair price for this unit, I would of made you an offer if you were in the USA just cause of shipping cost.
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I go to Austin all the time, I will have to use her next time
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The death of home mining is what's next, unfortunately.
It was a fun hobby while it lasted.
"Never give up never surrender." I have two dedicated mining rooms, and even if the stop selling in small batches. I will buy in bulk and keep home mining. |
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Degree C. In the sun at extreme. Its near Turkey
Ok wow I highly suggest trying on a small scale. That is extreme for a ambient mining. I think you will be surprised how much heat they can put out. Maybe someone has some advice but 122 F to start with is like a nightmare for a miner. You will not be able to pull outside air in and exhaust it out. You will have to have all air going through AC's. 20TH in that like you mention is just going to be hard. Around 117F ambient a SP20E, will need to be slowed down to 1.35Th to operate without hitting 125C on its cores. I imagine 122F it will need to be even slower, the SP20Es have a very hot running core, so they will probably still operate in this heat but at lower hashrates. As far as other miners I do not know, I only heat tested the SP20E. |
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Looks like you covered most of what I can think of.
The fact that they have 208V is another good thing. This means that they are at a business location with 3 phase power and not in someones garage.
Also.
There are 120V-240V kill o watt type device available but most DC's or business use metered PDUs, as you can tie the SNMP queries into your accounting systems.
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Since I have some of the info, I will share to help the others interested.
Location: Washington State
Local Pickup Only
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Even if the proof is very legit, I think other details would be required to get a loan at btcjam. I doubt they would fund an operation that big.
I have been involved in several orders of $5k and much more that was all done with cash or credit card, no loans involved. |
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Who's giving you $260/TH? I've talked to Bitmain, Spondoolies and Avalon in the last week and haven't gotten numbers that good from any of them.
It is very possible to get this low or lower, you just have to order the right quantity. Please show proof of any company with current gen miner doing this. Specifically the 3 companies mentioned in what you quoted. I don't see getting 260 and definitely not lower. Easily done. http://www.spondoolies-tech.com/products/holiday-special-sp20-mini-farm-batch-2$5495.00/15 = $366.33 each $366.33/1.7 = $215.49 per Th (Even if you go with 1.65 or 1.6 its still less then $250, cause getting them to 1.7 or higher is a PITA) That was only 15, imagine ordering in quantities of 50+ |
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' Higher voltage from the PSU will mean, for the same power draw on the miner, less current draw through your cabling and therefore less loss (resistive losses are current squared). However, higher voltage from the PSU means a lower duty cycle in a VRM miner which means increased current ripple (with losses in parasitic resistance on the board) and decreased overall efficiency. Higher voltage in a string miner means higher node voltages, and therefore higher current consumption. If anything, you probably want to lower the PSU's output voltage. I even saw a measurable difference in efficiency with my S1 testing between identical clocks and voltages with an 11.6V and a 12.0V input.
16AWG copper has 4.014 ohms/kfoot, so a 100 foot 6-pin cable would expect about 0.27 ohms. Powering an S5 at 600W you'd see 150W per cable, so 12.5A per cable, expected wire loss of 42W PER CABLE. That's big enough you'd have to factor it into delivery calculations since the endpoint voltage is less, and the current is that much more so the power loss is actually greater. Gross.
Thanks. That was what I needed, and of course I do not run 100' cables even if I needed on for that reason. I use 36" or shorter 16AWG Copper wires. |
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Unless your using 100-200 feet of extension cords,you should have very little voltage drop.A 3-6 foot cord will have negligible voltage drop. A little "boost" may be ok,depending on the device's sensitivity. Just keep a close eye on em & measure (volt,wattage,temp & performance) for a period of time to be sure your not harming them  What kind of cable are you using? I see VERY noticeable voltage drops with even 24-36 inches. That is with 16AWG Copper. And I have never seen a 100 foot PCI-E cable before, from what I know I do not even think 12V is usable if you tried a 100 foot PCI-E cable. you guys are talking ac and dc. @ op what psu do you have that is adjustable dc? this would be good to use with antminer s-5's You are correct I forgot to specify DC, I figured since I refereed to 12V it was obvious but my fault. I am talking DC. The PSU is HP DPS-800GB can adjust from 12.05V-14.0V with the breakout board. The boards were made by Jack Sausa, they have a small potentiometer on the board for adjust. |
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Who's giving you $260/TH? I've talked to Bitmain, Spondoolies and Avalon in the last week and haven't gotten numbers that good from any of them.
It is very possible to get this low or lower, you just have to order the right quantity. |
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Buy in bulk and it will reduce costs considerably.
Do not buy 1-3 SP31, order 20-40 then the pricing makes it so you can make profit.
No. You can no longer make your money back on hardware. Most of the people running miners today, like me, bought them last year. Now that I have them, and they are running, I lose more money by shutting them off and selling the hardware than I do by keeping them running. I will not make my money back unless the price of bitcoin goes back to at LEAST $700. But a small revenue stream is better than nothing at all. You are doing something wrong. Myself and many people make BTC when buying hardware from manufacturers. Wrong could cover living in a place with electricity is too high, Not buying the right equipment, Needing to build out your house to support more power, etc etc etc. |
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Unless your using 100-200 feet of extension cords,you should have very little voltage drop.A 3-6 foot cord will have negligible voltage drop. A little "boost" may be ok,depending on the device's sensitivity. Just keep a close eye on em & measure (volt,wattage,temp & performance) for a period of time to be sure your not harming them What kind of cable are you using? I see VERY noticeable voltage drops with even 24-36 inches. That is with 16AWG Copper. And I have never seen a 100 foot PCI-E cable before, from what I know I do not even think 12V is usable if you tried a 100 foot PCI-E cable. |
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Are you already finished with the prototyping and testing?
Is the production run already started?
I am interested in buying a few.
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So the question is....
Does anyone see better performance by slightly over volting the DC input?
On my adjustable voltage PSU's I used to tune then so I actually get 12.0V-12.1V into the miner to counter the voltage drop if the wire runs.
Just wondering if it does any good to maybe provide 12.2? or 12.4?
Same question for the opposite the PSU's that output exactly 12.0V on the breakout board are actually providing less then 12.0V to the miner, does this have any negative effect?
Is one way hard or easier on the VRMs?
Any constructive input is appreciated.
TIA.
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Just wanted to thank J4bberwock for the 2880W boards, these boards are great. Very easy to go dense with miners with these boards and their well made not a single issue. Thanks again.
Very nice setup, McHouston. I just purchased 3 of these IBM 2880 watt PSU's myself. I'm about to order 3 of these breakout boards and 15 AWG cords. May I ask how many S3's you have hooked up to each 2880 watt PSU? Also, if you purchased PCI-e cords as well, what length cords did you get? I put 8 S3's on each PSU, that picture was taken with the prototype boards so they only had 16 connections available. I only use 2 PCI-E cables per S3 and they are able to run at full power and not be in danger of melting the cable. Most are also overclocked to S3+ setting. I would keep it at 8 S3's per PSU even if I put the production 22 port version on that shelf. The wires in the pic are J4bber 36", I choose to use all 36" as the voltage drop was not that much since they are a good gauge and copper. These PSU's are beasts they will take an insane amount of heat. In the pic you actually see the intake for the PSU facing the same side as the exhaust from the S3's. So the PSU is sucking in hot S3 exhaust and having no issues. (I have redone this) |
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