Topic: [ANN] Spondoolies-Tech - carrier grade, data center ready mining rigs - page 493. (Read 1260354 times)

Fair enough.

I still recommend that people with nominal 120V systems use 110V for their load calculations until they've actually measured their supply voltage. Once you've measured it with no load, you should subtract about 1 or 2 volts for potential load-induced voltage drops. All this doesn't make a big difference, but when you're talking about trying to get, say, 12 amps on a 15 amp (12 amp continuous) circuit, even 5% matters.

Also keep in mind that the voltage at the service entrance (which is probably where your meter is) will be higher than the voltage at the miner, especially if your house or PDU has thin and/or long cables. Voltage at the miner is what matters.

http://www.buildmyowncabin.com/electrical/electrical-faq/difference-voltages-110-220.html

I was trying to find a nice article about these voltages Hope it's clear enough.

yes, I use 120V for calculations, that comes out to 1800W which is the very MAX on a 20amp, I believe this is why you only see them making 1600W-1700W power supplies for 110V-115V systems.

120V power is what it is .. http://helium.powerprice.info/meter/ << that's my "mains" at home.  I totally agree with the rest of your message.

Be sure you review the timeline .. $290 for 3mo or 6mo. Now it can be 400mo if you want to renew. I know several data centers which want to fill their racks with a lower monthly rate for the first months. If you keep the stuff there it will eventually flatten to a rate where they are getting a profit. Usually they waive installation fees just because the profits are made when the units are running there and no one looks at them.

Also, Spondoolies emailed customers about a month ago asking for a commitment to either hosting or free shipping. If you didn't opt for hosting back then, it may be too late to get those prices. The fact that bobsmoke is asking now what the price is suggests to me that he didn't purchase it then, which is why I listed the rates Spondoolies is currently advertising.

The crippled Rockerbox ASICs might pull less than 2700W per SP30, in which case customers might get a rebate from their hosting provider. Or they might not. Depends on the DC's policy, I guess.

Pretty sure the issue is whether or not the price will be lower, not higher. $290 per month sounded fair at 5-6THps, but if the unit is much weaker than that and we still have to pay the same price for hosting, it can become a much more costly affair than anticipated.

People paid for the SP30 only. The hosting was a bonus offered to anyone that wanted. It wasn't enforced or anything and I am sure that it's based on the power consumption. The good thing is that I don't think that it will vary a lot because we can't push the PSUs a lot more than 2700W.

The issue with voltage isn't the ratings of the outlets, but the losses inside the power supply itself. Power supplies are more efficient at higher voltages. http://www.hostdime.com/blog/208-volt-server/. Higher efficiency means less heat. If a PSU is 88.5% efficient, that means that 11.5% of the power coming from the wall gets converted into heat; if 91%, then 9%. A typical power supply therefore generates about 28% more heat at 120V than at 208V. Since PSU performance is usually limited by the temperature of the components inside, lower losses as heat translates into substantially higher power delivery capacity. Since the SP10 (and likely also the SP30) has its performance partially limited by PSU performance, higher voltages result in higher performance. You can run the PSU on a lower voltage, but you have to reduce the power delivery in order to not overheat the PSU.

An SP30 will work on two 20A 120V circuits. It just likely won't reach its full power. If the SP10 is any indication, you'll lose about 5% or 10% of your potential hashrate.

By the way, "120V" power is usually actually either 115V or 110V. 120V refers to the ratings for the plugs and cables and whatnot, which is the voltage not to be exceeded.

I can understand that .. They ship these with cords because they have different power inputs. What they want to do with the cords, is to make the power connection type uniform, no matter what the PSU is. These cords won't plug in your wall socket anyway.

If your GB stated $290 it should be $290 and nothing more regardless of power consumption. Those were the terms the customer agreed to.

They had me at "It comes with a cord"! (SP10 didn't come with any cords).

http://storage.googleapis.com/spond_public/materials/FAQ%20SP30%20PSU.docx

Here's again the power supply specs. Maybe it helps.

Can you explain how to lift the restriction? is it in the config file, or can it be done though the GUI?

I think the hosting fees the my SP30 GB will be lower. Waiting for the final specs any time now, but the original offer was for $290 per month. This may change depending on the power consumption.

Which US datacenter are you referring to?

In the datacenter I'm building, which should be coming online in a few weeks:

$0
$0
$192/mo to $248/mo, depending on whether you pay several months in advance or pay month-to-month.

In the official Spondoolies datacenter in Washington (which should be Titan), the rates are:

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$400/mo to $500/mo, depending on whether you pay 3 months in advance or pay month-to-month.

You can see those rates on http://www.spondoolies-tech.com/collections/products.

You can view other hosting options in https://bitcointalksearch.org/topic/hw-hosting-directory-reputation-622998.

Oh, I see.  I guess I got a "lucky" May batch unit then... when I first got it, I never saw anything over 1.3, but with the restriction lifted for the 110V power, and the 1.5.2 firmware, mine now hashes at just about 1.4 (usually cycles between 1.39 and 1.41).

I guess they will work with 120V, but then you will need to hack it as in the SP10 to get the same hash.

They said that they already sourced Emerson and Murata 1200W power supplies.
There will be two per SP-30 (at least that was the plan)
It should work even on two 15A circuits.
2X12(derated from 15)X110=2640W easily

bobsmoke, use the website ..

mrpark .. the difference between 1200W at 120V and 220V is the current going through those wires. Lower voltages require thicker wires.
Most of the power supplies are made to be used under 50% in extended load. If the PSU is high grade, this percentage increases.

The power supplies used here are "generic", in the sense that they can be used in a range from 90V to 250V. That means in case of lower voltage you have a setup requiring thicker wires than usual, especially in the case of running the crap out of  the power supply for an extended period of time.

Thin wires with high amperage tend to overheat.  It doesn't mean that the PSU is not delivering (being rated as it is) .. it is, but more of the precious energy goes to heat instead to the load. Hence measured at the wall, a poorer performance W/kH.

Now, there's so much one gets from a power outlet. It's limited by  the breakers, wire # etc. What ends up at the other end (not at the wall) of the power supply, the firmware tries to distribute to the hashing chips. But it can't distribute more than it has available, so that all chips work in the optimum range. Hence the efficiency difference in a product designed for 220V and one for 110V.

Maybe someone else can translate my post in "layman of the layman" terms. Definitely, basic things about electricity (learned in high-school, like ohm's  law) are forgotten here, or never known.