Step Up Converter Question | Bitcointalksearch.org

Artemis3

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Quote from: lightfoot on January 14, 2019, 11:17:32 PM

Mild bit: In the US, power is typically delivered by a transformer that takes the high voltage and steps it down to 240v with a center tap. That tap is where you get 120 on each side of your panel, 180 degrees out of phase.

In an office, it's stepped down to 3 phase power. From leg to leg it's 208 volts with 3 legs 120 degrees out of phase and 120v comes from tapping a leg to the common center.

Oh, you have an even better option then. The "office" solution is what they give here to residential (usually two from three phases). So you have access to 240v at home...

lightfoot

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Quote from: Artemis3 on January 14, 2019, 05:50:19 PM

No. You need to get two 110v circuits (from different phases), power a socket from that (the two hots), and you get 208v. That would work. Its usually what you find for dryer or ac plugs...

Mild bit: In the US, power is typically delivered by a transformer that takes the high voltage and steps it down to 240v with a center tap. That tap is where you get 120 on each side of your panel, 180 degrees out of phase.

In an office, it's stepped down to 3 phase power. From leg to leg it's 208 volts with 3 legs 120 degrees out of phase and 120v comes from tapping a leg to the common center.

Artemis3

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Quote from: theinsolentlynx on November 26, 2018, 05:33:40 PM

Greetings.

I have an Bitmain Antminer T9+ 10.5 miner with APW3++ power supply.

I live in the United States and have a dedicated 110V circuit I'd like to put this unit on. I don't have any more room in my panel for additional breakers at this time.

Would this setup work with a "step up" converter which converts the 110v to 220v?

If so, what are the pros and cons to this solution?

Any information on this topic would be greatly appreciated!

Thanks!

No. You need to get two 110v circuits (from different phases), power a socket from that (the two hots), and you get 208v. That would work. Its usually what you find for dryer or ac plugs.

You could in theory use two separate power supplies, and achieve about the same thing. Those could probably demand a separate circuit each... You see, if the T9 pulls 5A at 220v, its going to demand at least 10A at 110v, possibly more due to wire resistance.

Which is also why you cant just put a transformer, it would likely exceed your circuit capacity (if not the transformer itself).

philipma1957

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Quote from: tim-bc on November 28, 2018, 06:07:20 PM

I haven't yet seen anyone mention that Bitmain released a "low power mode"/asicboost firmware for the T9+ last week that cuts down on power consumption without affecting hashrate (assuming the pool is compatible). Might be worth a try, even if you still can't run all 3 boards.

https://service.bitmain.com/support/download?product=Antminer%20T9%2B

this is new and may help op.

tim-bc

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I haven't yet seen anyone mention that Bitmain released a "low power mode"/asicboost firmware for the T9+ last week that cuts down on power consumption without affecting hashrate (assuming the pool is compatible). Might be worth a try, even if you still can't run all 3 boards.

https://service.bitmain.com/support/download?product=Antminer%20T9%2B

theinsolentlynx

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Quote from: NotFuzzyWarm on November 27, 2018, 10:45:16 AM

Actually the APW3++ is rated for 1.2kw (100A @ 12vdc) on 110-120vac input and from experience is very happy putting out over 1,300w with a high line of 115-120v so running 2 cards is very doable and possibly even all 3 cards though that will be pushing things.

As for speed, the per-card speed = rated speed / number of cards.

Thank you all! Currently running 2 cards and hashing just over 7 TH/s.

lightfoot

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I think the answer is no. A step up transformer can double the voltage going to the power supply, but at the cost of doubling the current being pulled from the 110 volt outlet. Since higher current cause increased heat in wires of the same size, doubling the current will overload your 110v wires, pop the fuse, melt the socket, and possibly set things on fire.

Unless you have a 20-30 amp 110 volt service (anything's possible, but you're talking 8 gauge wires and some odd plugs) this is a really bad idea.

As a bonus, the converter will have a certain amount of inefficiency, so it will get warm and waste more power.

Best solution is to find a 220/240v outlet. Dryer maybe?

mikeywith

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I think nobody have answered your main question, rather everyone gave you solutions which is very nice of them.

the answer to your question is YES . the set up would work.

now that is from a technical point of view. but the economical point of view is that if you have a voltage converter that can handle the load required by the T9 then go for it. but if you have to buy it then it is not worth it " at least based on the current income of the old T9 you have".

now as for solutions, you have a few.

1- look for a firmware that allows you to modify the freq and undervold your T9 till it can be handled by the Apw3 on 110v.
2- take one of the hashing board out
3- risky * run the 3 boards, see if the psu is not overloaded, watch it for a day or so, it might just work !

but again, the T9 is really not worth mining with unless you have access to free of at least very cheap power rate. use whattomine.com to do the calcs, don't forget to reduce 1-3% of whatever profit they show you, for pool fees/internet failures/stale shares/pool bad luck.

if it will cost you more in power than profit. you better of keeping it switched off and buy btc directly.

NotFuzzyWarm

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Actually the APW3++ is rated for 1.2kw (100A @ 12vdc) on 110-120vac input and from experience is very happy putting out over 1,300w with a high line of 115-120v so running 2 cards is very doable and possibly even all 3 cards though that will be pushing things.

As for speed, the per-card speed = rated speed / number of cards.

theinsolentlynx

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Thank you both.

If I connect to the controller and one board, will my hash rate be approximately 5.25 TH/s? (Half)...or will it be less?

philipma1957

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fanatic26 gave you some good advice.

let me give you some more take your psu and connect it to the controller and then connect it to one blade your cost to do so is zero.

you will use 1/3 the power and I believe that is about 500 watts.
that psu should put out 500 watts easy on 110/120 volts

next piece of advice point it at

bravo-mining you get coin when a block is hit and a 1 btc bonus if you hit the block
mmpool you get coin when a block is hit you keep the block fees if you hit the block
solo.ckpool you get the whole block if you hit nothing if someone else hits it.

500 watts is 12 kwatts a day or 360 a month at 10 cents that is 36 bucks

you will most likely lose money at 10 cents a kwatt but if you follow my advice you have a chance at profit

fanatic26_

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This is a very bad idea for a number of reasons.

Reason 1: Unless you are paying $0.04/kwh you will be losing money running it.

Reason 2: Step up converters are not meant for a continuous 1500 watt load like you would be trying to apply and chances are it would burn up and be a possible fire hazard in your house.

Reason 3: You would be buying yet another piece of hardware and making an already nearly impossible chance at ROI completely impossible.

Sadly the T9+ is nothing more than a doorstop at this point, it never really had a chance to be successful.

theinsolentlynx

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Greetings.

I have an Bitmain Antminer T9+ 10.5 miner with APW3++ power supply.

I live in the United States and have a dedicated 110V circuit I'd like to put this unit on. I don't have any more room in my panel for additional breakers at this time.

Would this setup work with a "step up" converter which converts the 110v to 220v?

If so, what are the pros and cons to this solution?

Any information on this topic would be greatly appreciated!

Thanks!

Topic: Step Up Converter Question (Read 289 times)