Is that discount only available for Netherlands? I am in UK and I was looking for large psus.
nope, just tested it..... the dicount code is case sensitive though. "iloveBCT" shipping adress, method and payment method shoudn't matter... what browser are you on? |
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A little update ... with the following discount code: you get 20% discount ... Discount code is not working What product did you select? |
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A little update The website is live: www.bitcoinpsu.euwith the following discount code: you get 20% discount Some of the products 1000w+ (85A) - 8 PCI-e - 90.5% efficientSuitable for 2/3 of a S7, one Avalon or 2 S5's In theory it can deliver 1325 watt's however, due to heating it is sold as 1000w With discount: €60,-2000w+ (175A) - 10-16x PCI-eSuitable for up to 1,5 S7, two avalons or four S5's *It must me noted that this PSU is very loud, about the same of a S7* With discount: €92,-2800w+ (240A) - 12x PCI-ePerfect for a S7 of 1,5 Avalon With discount: €144,-3000w+ (255A) - 20-24x PCI-e - 90.5% efficientThis unit consists of 3 1000w PSU's. good for 2 S7's. All units can be powered on at once. With discount: €160,- |
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Hi All, The past two years I've sold around 200 PSU's to miners here in The Netherlands. What I realized is that there is no decent website to order server PSU's in the EU, so I opened one! you an visit it here: http://www.bitcoinpsu.eu/I have recently bought a large batch of power supplies. So big that I can't sell it on my own.. For that reason I'm looking for a couple of resellers of my PSU's. If you're interested, please have a look here: http://www.bitcoinpsu.eu/reseller.htmlRegards, Burks Hey I am kinda interested to resell those psu's But I got a few questions! So you sell the Power that is needed to run a bitcoin miner right? Not the bitcoin miners them self? I am from The Netherlands as well can it still work? How much do you sell a day? Thanks PM sent |
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These server PSU's deliver 12.2 volt afaik.
If you calculate with 12.2 volt instead of 12.0 the efficiency is slightly higher (~1%).
I calculated it with the actual voltage, but since voltages differ across PSU's and load, I didn't post all those values  |
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Today I tested with up to 5x S1, here the results  |
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Can you repair them as well ?
I bought three of them and one no longer work.
Or is it cheaper to me buy a used/new from ebay ?
Yeah, If you sent it back I'll replace it. |
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We need a psu ~1500watt for last s7 batches.....
The power rating on a PSU is based on the output, not the input... So if 1500w goes in, only 1350 comes out (at 90%) It looks like a nice build, but I think it's going to be difficult to give a warranty on that :S Unfortunately, the 2980 PSU's a quite expensive |
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Damn, I was interested until I saw the prices, I don't know if you source your psu really expensive or make a 3 digit markup but I'd be amazed if you sell them
Prices at the moment are just an indication. We don't have a lot of cables on stock, so we don't want to encourage sales (yet). |
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Hi All, The past two years I've sold around 200 PSU's to miners here in The Netherlands. What I realized is that there is no decent website to order server PSU's in the EU, so I opened one! you an visit it here: http://www.bitcoinpsu.eu/I have recently bought a large batch of power supplies. So big that I can't sell it on my own.. For that reason I'm looking for a couple of resellers of my PSU's. If you're interested, please have a look here: http://www.bitcoinpsu.eu/reseller.htmlRegards, Burks |
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In the end, you have a load which needs to be powered. It doesn't matter if you do that with a 2880w PSU or a bunch of 900w PSU's.
uhm that's quite wrong sorry ... it matters VERY much if you care about efficiency ... otherwise it's true yes The efficiency is a curve which normally peaks around 60 to 75 % load of the PSU. Outside that load the psu efficiency is WAY worse!!! You can actually see it in your chart the efficiency for the large units climbed and it would climb further if you applied more load up to ~75% where it would slightly go down again. So without a 2000watt+ load you wont find out the true efficiency of your 2880 watt unit. I think you misunderstood what I said. I completely agree with you on the fact that efficiency is a function of the drawn wattage. However: you can approach a situation from 2 vieuws: - the PSU is most efficient at 70%, so I will seek a load that is 70% - I have a load of X, how efficient is each PSU on that load. I prefer the latter, that is why I will test all PSU's at the whole spectrum of loads. with 6x S1 we will draw 2160w, enough to test all PSU's |
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You can't compare the efficiency if you don't take the total wattage of the PSU into account.
If you test each unit at approximately 70% load then you can compare them.
1300 watt test @ ~ 900 load
2000 watt test @ ~1400 load
2880 watt test @ ~2000 load
I'm sorry to bother you that much but I do believe many customers would like to know anyway.
Moreover I thought MOST server PSUs delivery platinum or even titanium efficiency yet the numbers you provide are hardly even gold efficiency.
I heard of 94-96% efficiency server units, which are they?
Well, Efficiency is basically OUT/IN. In the end, you have a load which needs to be powered. It doesn't matter if you do that with a 2880w PSU or a bunch of 900w PSU's. This week I'll extend the measurements up to 6x S1. I will add a 1100w ATX PSU to the test. To be honest, I expected higher efficiency as well  If you have a suggestion, let me know so I can test them the same way... |
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Yesterday the new meter came in and I deliverd the first 25 PSU's. The customer has some S7's (batch  and bitmaintech PSU's 2x Bitmaintech: 2672 3x 1300w+: 2792w So the Bitmaintech is still 4% more efficient :s Id did some extra measurements with the new powermeter  What I noticed about the 2880w power supply: As soon as the fans spin up, the usage increases about 30w (and that is already with 2x S1, not even full fan speed). Wow, these 2000 watt units are appealing  Running 2 units at 75% to 80% (1500 to 1600 watt) from one breaker seems ideal. (at least for me, I have exactly one double cable = 2 plugs to each 240v/15a breaker, max 3600 watt) At 75% they should normally run at PEAK efficiency as well. Very nice page you have. Thanks  Efficiency numbers for each unit would be great of course. If you can eg. load test 60 % or up to 80% on each unit, that should be enough to provide useable numbers. Moreover I never checked what protection features these units offer: Some very crucial ones are: 1. SCP (short circuit protection = MOST important, can save your life  ) I'll check that with a cheaper PSU if you don't mind. 2. OVP (over voltage protection) 14V (Almost on every PSU it is 14v)3. OCP or OPP (over current/power protection) This one isn't that important with HUGE single rail PSUs which I assume they all are. They're all singel rail. I'll test this again with a cheap PSU4. OTP (over temp protection) I know a 1400w PSU just quits at high tempsbtw on your page I didn't find these 900 watt units you talked about ... I've quit with those ones, since they're quite bulky and noisy |
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any news?
Just got them in. I will test it with 2, 2.5 and 3x S1 When running 3 PSU's on 2 miner 2x 103A = 206A 206/3 = 69A per PSU 69x12 = 828W per PSU A S1 is about 350w --> 2.4 x S1 should be the same load results: Tonight! Unfortunately my power meter broke a couple of days ago. When I test it with the Amp meter i get somewhere between 90 and 92% with 2,5 S1's attached.... I bought a new power meter, hopefully it arrives before the weekend... BTW: I just finished my webshop: http://www.bitcoinpsu.eu/ I hope you gys like it regards |
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any news?
Just got them in. I will test it with 2, 2.5 and 3x S1 When running 3 PSU's on 2 miner 2x 103A = 206A 206/3 = 69A per PSU 69x12 = 828W per PSU A S1 is about 350w --> 2.4 x S1 should be the same load results: Tonight! |
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3x ~900watt? If they deliver 93+% peak efficiency I'll take them. When do you need them? Early next week I can test the actual efficiency for you. |
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That price per unit is totally fine for me if the peak efficiency is as good as you say. (93-94%) Actually I don't care about the single PSU wattage. I just need about 2500+ watt at high efficiency for now. (maybe more in future) The units can be as low as 900 watt or as high as 2880 watt ... I simply order that much units to fill my "wattage" needs. (yes i know NOT to plug different psus to one and the same device due to slight voltage difference of each unit/load) I can make of 3 PSU's for 2x S7 That case the PSU will be around 92-93% efficient. |
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Ah nice numbers for the bitmaintech. (good efficiency)
I would like to order 2 units of the bitmaintech. (how many pci-e plugs?)
Are you doing escrow? and if, with whom?
Shipping is to: AUSTRIA
Haha, unfortunately, I don't sell those (yet) And still, before you have them here, you're looking at 145-160 euro per PSU without sales tax, so that efficiency comes at a price :S |
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8 pci-e 1440w unit is fine for me I would take 2 units But I would appreciate an efficiency test first.  (You can cut open the power cable "enclosure" and test the ac current-in that way.) Ok, so first test results are in: SummaryThe bitmaintech is really efficient with around 93,9-93,5% efficiency on a S7 batch 8. The new 1300+w PSU that I’m working on reaches about 89,5%. I did not fully test a 2880 with j4bber board, but on first sight, it is even more inefficient. Testing procedureI’ve hooked both PSU up to a Batch 8 S7. Next to that I tested: 1-4x S1 on the 1300+, 4x S1 on the 1440 and 2880 with jabber board on 1x S7 Batch 8 & 1x S7 batch 7. - All measuring has being done with a Voltcraft 4500 Advanced powermeter, a Voltcraft VC-330 powerclamp and a Tenma 72-7725 - Voltages were measured at PCI-e plug. - Time intervals was 10 and 20 min. Results S7 batch 8 Next to that I tested the efficiency with some antminer S1's as load. - tested with 1/2/3/3,5/4 x S1 on full speed  The 1400 got around 88% and the J4bberwock with 2880 drew 2875w for a S7 Batch 8 and a S7 batch unknown. If there is enough interest I will test more PSU's And if you have measurement wishes, please let me know! regards |
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yep great way to test efficiency compare your 240volt ac amperage to your total 12v dc amperage. The difference determines your efficiency. Looking forward to seeing your "real life" numbers. Unfortunately, I forgot a phenomena: "power factor" So now I've got this baby: http://www.conrad.com/ce/en/product/1340670/VOLTCRAFT-4500PRO-DE-9999-hrsThis weekend I'm going to do some experiments with a Bitmaintech, 2880 and my new PSU. I noticed just now that you have 1440 Watt PSUs in stock?
I would be interested in 2 of these 1440 Watt units, any details?
Shipment would be Europe, specifically Austria.
Normally I supply them with 8x PSU (10x PSU is +5 euro) Depending on the temperature they will do between 1000w and 1400w shipping for 2 is about 20 euro. Will one 900W Dell PSU be able to run 2 Antminer S3+ miners? If so will I still be able to overclock one miner since there are six 6-pin PCI-E cables coming with a single PSU. I will connect 4 of them with one miner that I want to overclock and I will run the other one normally with 2 of the remaining cables. Also I noted that the shipping cost to India is nearly double of the miner = € 52,59  Can I get some discounted quote on this deal please? I don't have the 900's anymore. I would advise a 1440w. Than you can overclock both S3+'s shipping for 1 is still 35 :s |
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