S19j Power Questions | Bitcointalksearch.org

mikeywith

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Quote from: NotFuzzyWarm on September 14, 2021, 07:20:37 PM

Are the power inlets bused together inside of the PSU and feed 1 monster PSU or do they independently feed 2 smaller PSU's that work in master-slave mode?

I believe the APW12 is made of two PSUs each with AC input, looking inside the PSU everything is duplicated, it's like you take one PSU and mirror it, you can get more details here > https://www.zeusbtc.com/manuals/Antminer-APW12-Power-Supply-Repair-Guide.asp

I personally prefer Bitmain's way of powering the miner to Whatsminer that uses a single C19 input, unless someone is building the infrastructure from scratch it will be very difficult to deal with PSUs that need a large enough wiring/mcb that can handle 3500w, when I upgraded some of my S9s to S17 pros, the process was very easy, I have C13 power cords that can handle one S9 + some margin, 1 S9 consumption is nearly half of S17 pro's power consumption, all I needed was take two S9s power cords and plug them into one S17 pro.

Installing M21s was not as easy, luckily I oversized my wires from the MCB to the miners, imagine I used wires that could barely handle an S9? I would have to re-run wires from the MCB all over again to be able to power the M21s.

NotFuzzyWarm

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Quote

since both C20 and C13 are rated @ 15A on the connectors

Well sort of.
NEMA puts the C20 at 15A but IEC rating is 19A. No idea why that is one of few places where the NEMA and IEC rating differ by so much. I've ran C19/20 combinations at 17A and they barely get warm so I'm comfortable with using the higher rating.

Has anyone taken a look at how BM is using the 2 power inlets? I hope to god they are not just bused together as powering 1 with the other unplugged will put 220V onto exposed pins either at the unconnected power inlet or male end of its cord...

DaveF

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Quote from: NotFuzzyWarm on September 14, 2021, 07:20:37 PM

Why BM chose that route over using a single C19 inlet like Canaan does with their Avalons raises all sorts of questions about what they are doing.
Are the power inlets bused together inside of the PSU and feed 1 monster PSU or do they independently feed 2 smaller PSU's that work in master-slave mode?

This is Bitmain, they did whatever was cheaper.

But, since both C20 and C13 are rated @ 15A on the connectors I would think that a L14 on the power input side would be better.

Yes I know that the unit is only 3100w @ 220 so it's below the 15A but I am just talking about the theory of what should be done vs just what will work.

-Dave

NotFuzzyWarm

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Quote from: DaveF on September 14, 2021, 04:26:50 PM

Quote from: NotFuzzyWarm on September 10, 2021, 09:41:51 PM

C13 is not voltage specific, it is good for up to 250VAC. It is however limited to 13A max which is why the s19 uses 2 in parallel.

Yes a C20 to dual C13 splitter is how to do it properly.

Going back years (OK decades) from when they first came into use in data centers I was always taught that you never split them. 1 <-> 1 and that was it.
Has it changed or was I taught wrong?
-Dave

Not really, but... Reputable UL-listed cord makers like Stayonline.com do it as properly as it can be done, basically molding two heavy gauge C13 cords to a male C19 connector. That said, there is still the technical concern of using a C13 cord with a 20A outlet... So, using 2x C14 inlets is still not the best way to power a single piece of equipment (here a PSU) mainly because you must ensure that both inlets are always powered or un-powered together but at least for this application it works.

In the case of server PSU racks using n+1 arrays of smaller PSU's to feed a common output bus- the trusty HP CS PSU's come to mind - splitter is still definitely a no-no because if just 1 part of the cord goes bad you lose 2 supplies.

Why BM chose that route over using a single C19 inlet like Canaan does with their Avalons raises all sorts of questions about what they are doing.
Are the power inlets bused together inside of the PSU and feed 1 monster PSU or do they independently feed 2 smaller PSU's that work in master-slave mode?

DaveF

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Quote from: NotFuzzyWarm on September 10, 2021, 09:41:51 PM

C13 is not voltage specific, it is good for up to 250VAC. It is however limited to 13A max which is why the s19 uses 2 in parallel.

Yes a C20 to dual C13 splitter is how to do it properly.

Going back years (OK decades) from when they first came into use in data centers I was always taught that you never split them. 1 <-> 1 and that was it.
Has it changed or was I taught wrong?

-Dave

NotFuzzyWarm

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Evil beware: We have waffles!

C13 is not voltage specific, it is good for up to 250VAC. It is however limited to 13A max which is why the s19 uses 2 in parallel.

Yes a C20 to dual C13 splitter is how to do it properly.

mystere_miner

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I notice that the S19's have two C13 power inputs. Can anyone tell me how much current each C13 draws on an S19j? I'm a little confused... I thought C13 was for 120V? This says it needs 240V. It's not 120V on each input, I take it? Or is this some technique so you can plug them into different circuits to share the load?

I have Nema 6-20P outlets, is it ok to use a Nema 6-20 to dual C13 splitter on the same circuit? Total draw is something like 2900W on my S19j 96T

Topic: S19j Power Questions (Read 137 times)