PDU, to use or not to use

[saintex]

Hello,

With many S9s how do you power your PSUs? via a PDU (HP EO4500) to a 30A 240V outlet or otherwise?

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[tim-bc]

Running 9x Antminer S9 per PDU with 60A 240V breakers seems to work quite well for many miners.

You should be fine without a PDU for a small number of miners. Just don't use 110V.

[saintex]

Running 9x Antminer S9 per PDU with 60A 240V breakers seems to work quite well for many miners.

You should be fine without a PDU for a small number of miners. Just don't use 110V.

What type of PDU are you using?

[Steamtyme]

Hello,

With many S9s how do you power your PSUs? via a PDU (HP EO4500) to a 30A 240V outlet or otherwise?

Hi there,

I couldn't find the exact specs on your PDU so it will depend on a few things. What I did find appears to have it rated for 24 amps and up to 240 V.

A rough estimate will be that you can use 3 S9's per PDU on this circuit.

I'll use 1340 for watts and the worst case scenario add 10% so 1474W   W/V=A

= 6.14 amps per miner. So 4 miners will put you over the rating on that PDU as it's rated for 24 amps(common)


Now, if you only receive 220V on the line this pushes the per miner amps to 6.7 amps. Which definitely puts you over.


Hope all that helps. Do you know how many machines you want to bring online or what your plans are for expansion?

[Philopolymath]

PDU's are total waste of money..... Basically they are just very expensive breakers & splicers for rich pussies with no DIY skills.

Just cut the male plug off of each c-13 power cord (use 14 gauge for Miner's PSU rated up to 1600W/220V)
Then direct splice each conductor from all  4x S9's  onto respective conductors of an 8 gauge line
(Make damn sure it's a GOOD solid well protected splice with solder & heavy gauge mars, well taped and in a splice box...)
Connect the 8 gauge to a 30 amp breaker (2 hot, 1 common/neutral, no ground for a 2pole, single phase, 220V)
You can either unplug each miner individually or just switch off the breaker to kill 4 units or kill the whole panel during lightning storms.
Works like a charm... cheap safe and effective and code compliant.

I ran 4x14Th S9's on one breaker at 26 amps for 9 months no problem...till summer heat wave then must watch the breaker does not overheat and trip off...on hot days (+80F)
I've only tripped off once because of overheat...breakers are relatively cheap if one does fail.

If you wish to stay under 80% load (24amps) and avoid the risk of heat/tripping breaker (3x S9/13.5Th + 1xS9/14Th) does the trick.
running them cold (50-65F) makes a HUGE diff in power draw.

Also knowing you only pull max power draw when fans are at 100% ...let's you cheat a bit on the draw.
So in winter with free outdoor -30c cooling... I can/have run 5...YES 5x 13.5Th S9's on a single 30 amp breaker by staggering the startup so each fan is spooled down and hashing along nice & quietly before adding power to the next unit.  (did draw 28amps mind you, but never did trip off)

[saintex]

well I may be considered by some to be a rich (wet) pussy but I think my DIY skills are above average.

Anybody else care to comment on the electrical code conformity of the aforementioned wiring technique ?

[Raymond_B]

well I may be considered by some to be a rich (wet) pussy but I think my DIY skills are above average.

Anybody else care to comment on the electrical code conformity of the aforementioned wiring technique ?

OK, call me a pussy (nobody's ever called me rich...), but I prefer my house to not burn down, I also prefer cleaner wiring, and peace of mind. The challenge with PDUs is finding low outlet count higher breaker PDUs. Most will have many outlets, but very low on-board breakers which is just the opposite of what ASICs need.

Here's some info from philipma1957 that has helped me out a lot. I have found a couple of these on eBay for cheap.

Hp makes a four socket pdu for 30 amp circuits

Runs 4 s9s with ease.

I get them on eBay for 35-50 dollars.

Hp 228481-002

[tim-bc]

If you are looking for a high number of breakers the geist metered PDUs can support 6x 20 amp breakers for 2 miners each at 240V, so up to 12 miners per PDU.

[Raymond_B]

If you are looking for a high number of breakers the geist metered PDUs can support 6x 20 amp breakers for 2 miners each at 240V, so up to 12 miners per PDU.

It's funny I just started looking at these guys for our data center at work. They have great prices and are super configurable. Never occurred to me to look at them for my ASICs

[fanatic26]

If you are looking for a high number of breakers the geist metered PDUs can support 6x 20 amp breakers for 2 miners each at 240V, so up to 12 miners per PDU.

If there is a problem that shuts off the breaker the PDU is attached to you will lose a large section of miners. Having a breaker trip and 4 miners shut off is much more desirable than losing 12 at once IMO and if you have a melted plug or something else that needs to be addressed there will be a ton of downtime.

[tim-bc]

If there is a problem that shuts off the breaker the PDU is attached to you will lose a large section of miners. Having a breaker trip and 4 miners shut off is much more desirable than losing 12 at once IMO and if you have a melted plug or something else that needs to be addressed there will be a ton of downtime.

You are right. What I was trying to say was that the geist PDU supports one 20A breaker per every 2 miners. That way, when something melts or arcs only those two miners go offline instead of the entire PDU. I don't use these PDUs myself but they work well from what I have seen.