Topic: [ANN] Spondoolies-Tech - carrier grade, data center ready mining rigs - page 515. (Read 1260354 times)

Because that 110V power has saved to many countries butts over the years.  'Merica!

But I will admit I still don't know why we won't conform with the metric system LOL!

But why? What could be the explanation? And why aren't they changing those rules that are over 100 years old?

They've got Thomas Edison to thank for that. He wanted lots and lots and lots of local power stations all supplying low voltage DC, where as Westinghouse wanted big power stations delivering high voltage AC.

How do you know they don't have the first set of chips in hand? You don't.


Do you happen to know the reason why all US is using stupid 120V circuits?

No, I don´t mean it would trip the breaker (which it easily could if the breaker shuts the line down at 20 amps).

I mean that the PSUs in the miner will not be able to supply the full amount of power on the internal 12V circuits because it is only rated to 1050W per PSU at 120V input.

Just switch to a 208V or 220V circuit, 120V circuits are a stupid idea anyway.


As the month is very near its end now, I am looking forward to my sp30.

No.

2750 W / 120 V = 22.92 A.

The breaker will likely trip if you try to draw more than 16 amps continuous, unless it is a 100% rated circuit breaker. 100% rated circuit breakers are very rare in that size; you usually only find them in the hundreds-of-amps sizes.

The 80% derating isn't something that you choose to apply. It's in the National Electric Code (although in there it's actually described as a bunch of 125% rules, where "continuous" loads are considered to be 125% of a noncontinuous load). It's what circuit breakers are designed for, and how they behave. They aren't guaranteed to trip at 80%. They're just likely to, especially if the ambient temperature goes up. (Circuit breakers use a bimetallic strip to sense the breaker's temperature and trip if it gets too hot.)

At full speed and 120V, one SP30 will use about 70% of the usable capacity on two 20A circuits. You might be able to stick 300 W more on each circuit before they start tripping. Adding an Antminer would be a gamble, though it could work.

Even underclocking it won't help you much. 2500 W / 120 V = 20.83 A. I'd be surprised if that didn't trip within an hour.

Chances are, your situation is even worse than that. 120 V is usually used to refer to the voltage class in terms of what devices are rated to be able to accept. The actual voltage that is delivered on circuits rated for 120 V is usually around 115 V.

I take it you mean this is a datacenter circuit, not a direct current circuit?

115V 20A circuits are a very expensive and inefficient way of delivering power. It will also likely cause your SP30 to underperform. You should ask your datacenter for 208 V or 230 V circuits instead. If they don't have that available, you should switch datacenters.

You mean it will trip the breaker? Well I am paying a flat rate for the 20 Amp circuits so I guess I would have to under-clock the SP30.  Or maybe use 2 circuits and somehow find some other smaller hardware to use up the extra amps (probably S3s).

Yes, I also worry that the time is very limited and would be some small delay of the first delivery....?

I know they are a good crew but without even having the first set of chips in you think it will really be that smooth?

Well this month for sure even if there are just 10 days left.

So, when is the first batch SP30 going to be delivered?

I would not recommend it, as the internal PSUs are not going to be able to deliver the full 2.5kW to the asics.
You would have your hashrate reduced by ~10%

Can one SP30 be made to run off a single 120V/20A circuit?

This is a DC circuit with wiring good for 30A+ and a commercial grade PDU, so I don't intend to de-rate to 80%.

I live in UK. I can't really perform any installations at the house as it doesn't belong to me. I'm just only renting the place :-)

+1 QG

Why not trade the a/c for 1-3 big ass vents to move the air outside the room?

2 units in one of the rooms? 2 units will produce ~5.4-5.6kw equivalent of heat and will require four 15A curcuits (if you are at 110V).
In my experience in regular size US bedroom, like 16' X 18', 2.2-2.3kw increased ambient temp to 33oC (from 28oC) with A/C going full blast 24hr (in summer time).

Thanks guys. I have been thinking about leaving some space between units, so they are not directly stack up on each other, in order to have some air flow in between the units. Maybe you are right it wouldn't make a difference as I will keep them in my house in one of the rooms.

yeah, I try to control my rigs through api, as it is easier to group them.

It kind of sucks if the reported hashrate isn´t accurate.... for my internal statistics that is.

Mine report around 1,200GH through the API and around 1,300 in the GUI/Pool so around 8%

It wouldn't normally be a problem but I rent my rigs out and the site uses the API to determine the speed so they appear to purchasers as slower than they are.