Topic: Wiring for 5 Avalon 741s (Read 916 times)

Agreed for 220 only. But if running wire and paying for the labor it is a negligible cost to run a neutral as well. You never know when you might need it for 110 volt fans or if you end up getting 110 volt power supplies. I will freely admit I am fairly new to mining and only basing my opinions on my limited experience with my 6 miners but when it comes to electrical I have wired up an entire house and a half dozen shops, water wells, etc. I am no licensed electrician but I have wired a ton of things. Running wire is a pain in the ass especially on existing houses so make sure you only have to do it once. For my mining room I ran 4ga wire with a neutral to a subpanel. The last thing you want to do is hire an electrician to do it and pay him a small fortune only to find out a couple months later it wasn’t enough and you have to call him back.

That should help. I have no antminers what I am describing is a single 741

I said I didn’t know the airflow and you would want at least that. My point was running five of them through a regular 4 or 6 inch bathroom  duct wasn’t going to cut it. Sounds like it needs more than I thought

I completely agree with Phillipma1957
Anytime you are moving air through a duct you will get restrictions. The best thing you can do is increase the cross section of the ducting you are using as accommodates for the restriction, and also increases the velocity of the airflow. Having seen a few of Phillipma1957's photos/ videos he has a great idea by placing the mine within the wind tunnel, I can't say for sure but upon a fan failure in the unit this might also help save them because they still have airmovemnt across them.

please delete the bolded info   it is simply wrong

 a 4 inch  for 1 avalon 741 = restriction and over heating
 a 5 inch for 1 avalon  741 = restriction and over heating

I had a lot of avalon's the 4 the 6 the 721 the 741..

I have found  putting the entire unit inside a tunnel design  works better for heat  and sound

or a box  with adequate large ducts of ten inches  for 2 units.

The Neutral is only required if the 220v feed is also going to be split to supply 110v.
Since they are only using 220v then normal NEMA 6-30 (or the 40-50A versions) plug and sockets are used. Just the 2 hot lines and ground.

Thanks for your thoughts.  These are Avalons so they run about mid-60 decibals.  Sounds like you might be running Antminers which are mid 80s in decibals from what I have read and seen?  But yes, I am trying to account for noise as well.  I am thinking of lining my wine room w/ this Barium accoustic wall board which is supposed to help a ton for noise reduction.  The floor of the room is cement, but I will probably line the walls and ceiling with this stuff: http://www.homedepot.com/p/54-in-x-240-in-Acoustic-Insulation-Roll-7102-11054/302759769?cm_mmc=Shopping%7cTHD%7cG%7c0%7cG-BASE-PLA-D22-Insulation%7c&gclid=CjwKCAjw0qLOBRBUEiwAMG5xMPatrNJF84UwOBeTxw-EwqIck8vZYq_hKzW_8DX4gxtAD_N-87BR1hoCdEcQAvD_BwE&gclsrc=aw.ds&dclid=CLHY082hwdYCFYF3wQodgQIPcQ

Yes, he is going to run 220 V on the 30amp.  We also discussed a 40amp breaker and larger wire.  I'll probably just do that.  Thanks for your thoughts.

I hope the 30 amp circuit he is running is 220 V - two 10ga hot wires plus a neutral and a ground.

Are you planning on running the miners on 110 or 220? You can only put one miner per 20 amp 110 circuit but you could run two on a 20 amp 220 circuit.

The larger wire and breaker are not that expensive relative to the cost of the electrician doing it. I would have him run larger wire and have at least 50 amps going in there.   

I don't see the specs listed on CFM for the 741's but I would want at least 4" of duct size for each one as that is about how big they are so as not to cause a restriction maybe even 5" - edit this may not even be adequate. My point was I don’t think a typical bathroom duct will be adequate for 5 miners

I would think if all 5 are going into one duct it would need to be about a foot in diameter so as to not cause restriction.

I hope your cellar is sealed well and away from things. The miners are about as loud as a vacuum cleaner. I had one running in my office of a 3000 sq ft house and with the door closed you could hear it anywhere in the house.

These things are not really designed to be ran in a home. I moved mine out to my detached shop. It runs fine out there with no AC but it is a huge shop and one unit can't heat it up. A bunch of them in a small space will make it very hot in there.

We have a pond about 150' away from my shop that we fish in during the evenings. Sitting at the pond fishing when it is quiet I can hear the miner running 150' away.

Guys,
Thanks so much for the input so far.  It has really helped.  The electrician came to my house yesterday and I am waiting on the quote.  I have begun thinking about how I will exhaust the heat from 5 miners.  What do you think of this idea?

1) Above the wine room ceiling runs the exhaust tube from a nearby bathroom.  I could easily patch into this by cutting a hole in the wine room ceiling. The tube exhausts out the side of my house.  Do you think a standard bathroom exhaust vent is too narrow to force the heat through (remember, its 5 Avalon 741s)?  Should I just bite the bullet in run a separate exhaust vent out the side of my house?  This would probably be a huge PITA, but maybe its the correct way to go?
2) Also, I will be creating a hot and cold side for the 5x5 wine room.  I have a 1200 watt A/C unit that could feed the cold side, but that would just jack up my power bill even more.  There is a nearby basement window?  Could I just feed cold air through there, except on hot summer days?  Not real sure how to go here... maybe room temperature air is fine??

Finally, my last question....

3) I have one 20 amp circuit and the electrician will run one new 30 amp.  Does a PDU exist which I could plug both circuits into (for a total of 50amps?) and then fan out the power that way?  Is this the correct way to go?

Thanks for your help.

Steve

I can emphasize the heat that others are mentioning enough. It is a lot. You know those little ceramic disc heaters that you can plug in and heat a room? A miner puts out a similar amount of heat.

if you don't drink enough wine your wine closet must be filled with wine bottles

While you are waiting for the miners to arrive....
Again I must emphasize cooling needs. Miners are 100% efficient heaters so to get an idea of what that means - get a few el'cheapo 1kW or more electric space heaters and run them at full power in the miner room. Preferably enough heaters to simulate the full 5.5kw load is best test of course...

and to top it off just for you


this will allow 4 for sure 5 maybe

https://bitcointalksearch.org/topic/m.22020934

Ohh, the PDU and 30 amp circuit is a very good idea!  Thanks for your help and thanks for the link 

Read Bitcoin Mining 101.
5x of the A741's will pull 5.5kw.
Hire the electrician and have them put in a 30A 220v line then get a small PDU to fan out the power. That is by far the single best thing miners can do as finding PSU's for 110v is a PITA and they are expensive.

As said you will be pulling 5.5kW and that equates to 18,783 BTU/hr of heat - better have a way to remove it...

I have 5 Avalon 741s on the way.  I am converting a useless 5'x5' wine closet (I don't drink enough wine ) into a mining room.  There is one 20 amp line & outlet which runs into the room (20A x 120V =) 2400 watts.  I have the following questions.  Also, I am thinking of hiring an electrician to run two more 20 amp lines to the room.

1) Will I be able to run two miners off of a 20amp outlet?
2) Are two more 20amp lines enough to run all 5 of my miners?

Thanks for your help!

Steve