Power supply problem with my antminers U2+ and the usb hub??

[oskuro]

hi i have a problem.

I have this usb hub i bought on ebay with that power supply it came with:

http://www.ebay.es/itm/261433004354?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

the power supply says: INPUT 100-240 V - OUTPUT 5V == 3.5A

and i have a raspberry pi connected to that usb hub, as well as 6 antminers U2+ and a vent.

I have minepeon, and bfgminer.

The problem is, that i have the 6 antminers but seems like 2 of them have this problem:



and finally, 1 antminer disconnects and it says i just have 5, and then they all work fine:



my question is.... maybe this is because my power supply for the hub is not enough, and like i have a vent, 6 antminers u2+ and the raspberry pi connected to the usb hub, they dont have enough power and thats why 6 antminers cant mine together and just can work 5?? here is the usb hub with the antminers and the vent:



Also here you can see, even with the raspberry pi connected to my computer, and the usb hub just with the vent and the 6 antminers, that 1 antminer always accepts less than the others, and runs at a lower hash rate:



So if thats the problem... what power supply do you recommend me?? i saw this one:

http://www.ebay.es/itm/5V-8A-40W-LED-Power-Supply-Netzteil-230V-AC-fur-WS2801-WS2811-WS2812-B-Strip-/281268122538?pt=Netzger%C3%A4te&var=&hash=item417ce2f3aa

and if you can recommend me also another usb hub because i need to buy another one.

Thanks

[$toke]

An AntMiner U2 requires 2.95W at 2Gh/s, per the Bitmain website. That means that you must account for .6A or so for each miner, and leave a little extra to keep the hub from burning out prematurely. Six miners are drawing 3.6A, not to mention whatever the fan is using, clearly putting you above max. I saw your ebay post and assume you're not in the U.S., but for what it's worth I am running five of these AntMiners on a Rosewill 10 port hub as well, but the 5V 4A version. http://bitcoinrigs.org/wp-content/uploads/2013/10/rosewell-10-port-usb-port-2.jpg Got it on Amazon. I also don't suggest you buy another psu and try running your hub with it: if the two are not rated for each other, you're probably going to short out/probably destroy your equipment/probably get shocked/probably start a fire. Good luck man

[oskuro]

An AntMiner U2 requires 2.95W at 2Gh/s, per the Bitmain website. That means that you must account for .6A or so for each miner, and leave a little extra to keep the hub from burning out prematurely. Six miners are drawing 3.6A, not to mention whatever the fan is using, clearly putting you above max. I saw your ebay post and assume you're not in the U.S., but for what it's worth I am running five of these AntMiners on a Rosewill 10 port hub as well, but the 5V 4A version. http://bitcoinrigs.org/wp-content/uploads/2013/10/rosewell-10-port-usb-port-2.jpg Got it on Amazon. I also don't suggest you buy another psu and try running your hub with it: if the two are not rated for each other, you're probably going to short out/probably destroy your equipment/probably get shocked/probably start a fire. Good luck man

Ok thanks so much. Now they are working perfect. I reduced the overclock to previous frequency, and now the 6 work without problem. The antminer will use an own psu(just bought it), but i would like to buy an usb hub with vertical align for the antminers, just like the one i have. Can you recommend me any that comes with a good psu? thanks

[$toke]

The Anker 10 port 3.0 hubs are supposed to be pretty good. 12V 5A

[oskuro]

The Anker 10 port 3.0 hubs are supposed to be pretty good. 12V 5A

I cant use 3.0 usb with raspberry pi and my antminers u2+, just 2.0

[$toke]

Sorry I had forgot about that. I too am running off an RPi, and just a heads up: you're going to have a hard time finding a hub strong enough that isn't 3.0 to power all six. As a suggestion, get two hubs. I used this thread to help me out https://bitcointalk.org/index.php?topic=253749.0 great info on all the community top rated hubs

[oskuro]

Sorry I had forgot about that. I too am running off an RPi, and just a heads up: you're going to have a hard time finding a hub strong enough that isn't 3.0 to power all six. As a suggestion, get two hubs. I used this thread to help me out https://bitcointalk.org/index.php?topic=253749.0 great info on all the community top rated hubs

Ok thanks mate

[HweeShyan]

i have 5 u2 and my winxp detect only 3 but when connect to win8 it detect all 5, i think its OS problem, likely OS dont support the driver? (sorry mine U2 donno if it's U2+ maybe problem related :p) winxp is 32bit win8 is 64bit bgfminer 64bit for win8 and bfgminer32bit for xp

in xp when 3 stick plugin all port id show ok but when plugin 4th miner, the 4th port id show error.