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I plan on installing 240v outlets for my new S7's. My electrician is asking how many amps? I cannot find this information on the Bitmain website. Thanks as always!

I suggest reading on 240 a little more.  He is asking about the breaker amps.   I personally would ask 30 if your breaker box can handle it.  Then get a 30 amp PDU, make sure he put's in the plug that you need for the PDU.

Wait for someone else to confirm before you tell him.  But I would say 30 as long as you can handle it. 

http://bitcoinist.net/exclusive-1st-review-bitmain-antminer-s7-4-8-ths-using-1250-watts/
https://bitcointalk.org/index.php?topic=1177795.0

Why dont u build you own rig?

http://vanvandeformell.com/images/miningsoftwarebitcoin/GpuBitcoinMining/bitcoin-mining-blog.php
https://news.bitcoin.com/wp-content/uploads/2015/09/multiple-gpu-password-cracker.jpg

Sorry, part of links not asic. Just example. =)

I think your looking at wrong examples.  His electrician asked how many amps on 240..... so were talking about a breaker. Example - http://www.amazon.com/Siemens-Q230-240-Volt-Circuit-Breaker/dp/B00002N5HJ

I think 30 amps as long as electrician say's you have that much you can do.  But I was hoping someone else would agree, or comment better if there is a better option to tell electrician.   

I've gotten feedback on some other sites saying 20 amps is the way to go. The calculations are: S7 uses roughly 1300watts...so 1300w / 240v = 5.41 amps...so each S7 needs around 6 amps. If you put an outlet with two available plug sockets on the 240v/20amp circuit then that would be ideal. You could run two miners on your 240v/20 amp circuit. Other input is appreciated as I am not an electrician.

Ahh, be careful, the S7 power consumption at the wall is now 1410-1480 depending on PSU efficiency, so if you come up with tight calculation, you could bust.

Any reason they went with the 20 amp?   Unless it is you don't have the extra amps I would go 30 amps.

You will thank me when you get a 30 amp PDU and have 30 amps worth to power miners vs 20.   I don't see an advantage of 20 unless it's all you can handle.  I personally went 30 as I had enough amps and wanted 30 amp PDU vs 20 amp PDU.

Are you using a 240v/30 amps (breaker) or 120v/30 amps? Based on the calculations you would definitely need 30 amps with 120v. I didn't plan to use a PDU. Just an EVGA or Bitmain's PSU plugged directly into the outlet.

Does 30 amps help them run more efficiently? So am I still correct to assume I can run 2 miners on a 240v/30 amp circuit (basically use top and bottom of the outlet). I have the power available.

Better power density. And with all the people reporting miner failure because of electric surge, you'd probably want to use surge protectors and PSU with UVP/OVP, like the EVGAs.

Are you recommending something like this to plug the EVGA into? It would be nice to monitor the amps on each miner but I'm not sure this is a proper surge protector.

http://www.amazon.com/Tripp-Lite-PDUMV30HV-Metered-Vertical/dp/B0012VN0I0/ref=sr_1_cc_2?s=aps&ie=UTF8&qid=1453786119&sr=1-2-catcorr&keywords=30+amp+pdu

Thats a PDU, not a surge suppressor, not sure if this has surge protection. Personally i just use a surge protected strip bar, it cost 20$. But a PDU can be useful in certain situation.

Maybe someone that knows more about PDU can tell you about them. So far i only use 120v.

I had my miner on a 20a circuit (120v outlet) and it just taxed the crap out of the wires and system. I would suggest 30a minimum, and be sure to get a PDU or surge protector!

Yes you will want to get a PDU that is enough AMPs.  So if you get 20 amp... you only need 20 amp pdu.  If you get 30 amp I  would get a 30 amp pdu.  Either way you really need a PDU to distribute power to your power supplies from your 240 line.

I would suggest checking ebay though.  You can get PDU's at a great discount on ebay used vs buying new.  I owe learning this from phil.  But I saved a ton going to ebay.

Is it safe to run 30AMP on a 30AMP circuit? Every breaker i have have a warning labeled "Rated continuous use is 80% of rated value". In this case that would be 24a i believe?

okay  missed this.

if you are having an electric man come in.
if you have enough empty spaces on your panel

you should do 2 things get a whole house surge protector



http://www.amazon.com/Square-Schneider-Electric-HEPD80-Electronics/dp/B00CONA1OQ/ref=sr_1_1?ie=UTF8&qid=1453852015&sr=8-1&keywords=whole+house+surge+protector

and get a l6 30- r installed

http://www.amazon.com/Superior-Electric-YGP017F-Electrical-Receptacle/dp/B00J3Z9X60/ref=sr_1_8?ie=UTF8&qid=1453852121&sr=8-8&keywords=l6+30+r

to do the above you need  4 spots on the circuit panel

now code for 30 amp is 10AWG WIRE
CODE for 20 amp is 12 awg wire

I would hope the op has his panel rigth near the spot he wants the power out let.

a 30 amp circuit will run a 30 amp pdu

the pdu should have a fued and derate to 24amps.   this will allow for 4 s-7's on the pdu

24 x 240 = 5760 watts   that is 4 s-7's

here is a good pdu on ebay

low end

http://www.ebay.com/itm/216858-001-Compaq-50-60Hz-24A-4-port-PDU-Power-Distribution-Unit-Upgrade-/390708088945?


you may want better

here is a good one

http://www.ebay.com/itm/HP-MODULAR-PDU-CONTROL-UNIT-SERIES-EO4500-Heavy-Duty-/221975855071?

last one http://www.ebay.com/itm/APC-BASIC-RACK-PDU-12-PORT-MN-AP9571-208V-50-60HZ-24A-/171699304728?

I have never ran 30 amp on it.   The big thing is it gets you a decent amount more then 20 amp.  But you are correct I don't see running it at full 30 amp.  Just like 20 I don't see running at full 20 amp.

This is why I suggest he goes 30 as long as his panel can handle it.  Also possibly will save him money if he does run 2X amps from having to get another line ran.   I don't see dis-advantage with more as long as he can handle it.

that is why I linked him to pdus rated for 30amps  since they top out at 23 to 25 via internal fuses.

You guys have been a huge help. Thanks!

I just talked to my electrician. We are doing (3) outlets each connected to its own 240v/30 amp breaker (I have the space). There is a surge protector being installed on the whole panel (internally). I will go with one of the PDU's shown above that are rated for 30 amp but pushes less. The outlets are right by my panel which works perfect. My plan is to only plug 3 miners in each PDU to start as I work my way up to 9 miners (3 PDU's).

Has anyone seen a difference with using the Bitmain power supply compared to the EVGA power supply? The Bitmain's is much cheaper and didn't know if the EVGA is really even necessary with my electrical setup now. I know most people use the EVGA because they are using 120v. Thoughts?

Once again thanks for all of your help thus far.

They're better, more expensive PSU's. If you want cost effective, go ahead. Personally i like the cleanest powers for my miners. But with how much money you can save, then maybe servers PSU's are the way to go.

However getting PSU packages from the forum is a better price. The Bitmain PSU is not really that much of an interesting buy.

EVGA to get the PCIE cables and power needed your up to the EVGA 1600, it runs around 400 or so.   So extremely high.   You can get server PSU's much cheaper.

There are some "kits" that can power multiple S7's if you go big enough.  And there is of course the bitmain server psu.   I have not had any issues with them they seem to work good.

With getting 240 I would compare prices on kit's and bitmains PSU.  Either way you go it will beat the EVGA by far on cost.

You can use 1300W fine, and thats 175USD but yeah its still expensive to power a single S7, especially with the nice kits using J4bberw0ck's breakout boards.

The 1300 does not come with 10 PCIe cables.  Also look at B8/B9 efficiency.   I would not guarantee a 1300 doing it on current batches.

Even if it did run it would be pushing the 1300W pretty much at max unless you under-clock it.

The EVGA, unlike most PSU out there, are underated for efficiency, at least, their peak limit is much higher than their rated #.
They can actually run their "100% load" no problem. Their components does not degrade easily and as such you'll find yourself possibly not needing to ever RMA it. My EVGA 1000 with 3 years used get the same reading as the brand new one. So running them at 98% load is just fine, it can handle spikes easily from there, it even handle 104% no problem. Though i'm not sure whats the true limit is.

They really can do their rated load, DC, continuously with no problem. The only downside is efficiency loss.

Now i don't know if this numbers hold across all that S7 design, but so far i get 1280W DC with my B8. I run the fans at 3360 RPM.

And yeah, you might need to get an extra cable, or maybe not, the way i set it up is;

3 double, 1 per blade, 1 single 1 per blade. Then a periff for the controller. I did not need to come up with any extra cables myself.
I don't know where i got these PCI-e converter, but i have so many of them. And since these baby are modular, i simply used a 3rd double from another EVGA.

Worse case scenario, if you somehow has absolutely nothing on hand (i have spare of everything, because being ready for anything is my motto). Grab some extra cables and perhaps y splitter while you're at it. Start by checking Finksy and Klondite's stuff.

In this case, you could get 2 4$ y splitter. If you absolutely have nothing on hand for some reason.

You only need the 240v setup if you plan on using their PSU. As others stated, can use EVEGA or another server PSU, you just need to be able to handle ~1300 watt continuous. That being said:

You should have a 20% buffer for continuous use.

Watt = Volts x Amps
so 240 Volt @ 10 Amps = 2400 Watts - 20% (480) = 1920 Watts which is plenty for a single S7.

So a 10 amp breaker would be fine for a 240V setup.

If sticking with 120V standard US then
120 Volt @ 15 Amps = 1800 Watts - 20% (360) = 1440 Watts continuous, which would also be plenty for a single S7.

So a 15 amp breaker would be fine for a 120V setup. That being said, you really shouldn't plug anything else into that circuit.

Hope this helps, any other questions feel free to ask.

Edit: Keep in mind this is for a single S7, I do not know how many you intend to setup. So adjust the math as required.

If he's paying a electrician it would be a shame to pay for a 240 10 amp to be put in.  It will be a little cheaper due to equipment.  But hes already going to pay for his time I would guess on electrician.

With paying for his time he might as well get 30 amp whall hes doing it.   There is not a drawback to getting it assuming the cost is not rediclous on price, some electricians do very high cost compared to part's/time.

I'm not telling him not to get 30 Amps... All I am doing is providing the math to him so he can make his own decision on what he wants. If he is running more than 1 machine, he will need more than 10 amps anyway.

The more important math in this case is the electricians cost I think.   I have a feeling 10,20,30 amp same amount of time on install.  So chances are only big difference is part's which 30 will cost a bit more.  But if your paying a electrician I have a feeling 30 amp will make most sense in almost all cases.

And also OP ask for a quote.  I had one electrician who wanted over a thousand dollars for 1 240 30 amp (way to much and to high).  Needless to say I did not use him.  I think he did not want job after seeing some miners, when he saw them was when I could tell he lost interest. 

I will let you know the quote when I get it this week and the scope of work. I am putting in two 240v/30 amp circuits and a surge protector in the panel.

Good this would give you 240 x 30 = 7200 watts before 80% derate for safety or about 5700 watts per circuit.

I have two 30 amp 240 volt circuits for mining.

I have been able to 8 avalon6s for my two circuits.

I am happy I did these two circuits.

I do about 4000 watts a circuit