So I have been talking with a buddy of mine who has an S9 and we are looking to understand what is the best solution for powering it.
Being as the psu it comes with says it needs a 240 V line and we live in Canada where the typical electrical line is 110v. According to the instructions on the bitmain site is seems to indicate the included psu can run on 110 v, but it does not make mention of how many amps it needs on the 110 volt line.
So, I had to do some research to understand exactly what the difference is between 240 v line and a 110 v and how it affects the amperage of the current. As well, we have heard that there is 1 phase and 3 phase electricity to consider as well.
Being as not much info is posted about this on the bitmain site I am writing this post to put the information out there about the details of what is needed, because I have heard and seen stories of some people melting their outlet plugs in there house when they are trying to run some miners...so here goes...
The first thing I am researching is:
What is 1 phase and 3 phase electricity
Here are two videos that help to explain what these are in very easy to understand terms.
And further to that...this one takes understanding 1 phase and 3 phase electricity further...
and this one explains it again, also in terms of how it enters the house:
So how that that part is understood, the next thing I want to understand is more about house wiring from the panel to the outlet. At this time I am not sure if the antminer APW 3++ would work well on my home wiring, or if it needs to be hooked up using a commercial line in a commercial building.
On the bitmain product page, it just specifies:
1. The power cord is not included, please find one with at least 10A from your local market.
2. The APW3++ can deliver a maximum power of only 1200W if it is connected to a 110V mains power supply. To obtain the rated power of 1600W, the APW3++ must be connected to a 220-240V mains power supply. Please check the mains power supply that is the standard in your region before ordering.
After reading that, it doesn't say anything about 1, 2 or 3 phase line, and it is not clear to me if only a 10 amp line is needed for a 240 v line, or if only a 10 amp line is needed for 110 v.
But before getting to that, I have found out that there is a thing called the power formula, which is watts = amps x volts.
So in the case of the APW3++, that total output in volts is the same at 12 volts whether it is hooked up to a 110 v or a 240 volt line using the power formula however the power output is 1200 watts on a 110 volt input line and 1600 watts on 240 volt input line.
Now that I am understanding the the measure of power is Watts and that watts is simply volts time amps then really the determining factor seems to be how many watts does the psu put out and how many watts does it pull in, and this has to be within the limit of amps and volts for the line that is providing the power to the psu.
So, this makes me a little concerned, because if the psu wants to put out 1600 watts I suppose it is going to try doing that even on a 110 volt line when it is only putting out 1200 watts. I don't know if that is true or not so on with the information finding...
The next thing I checked was the specs on the S9 and here is what we got:
1127W (11.5TH/s batch), 1225W (12.5TH/s batch), 1274W (13TH/s batch), 1323W (13.5TH/s batch), 1372W (14TH/s batch) (at the wall, with Bitmain’s APW3 PSU,93% efficiency, 25°C ambient temp). Expected discrepancy of +10%
Being as the expected discrepancy of +10%, then this means even the 11.5 TH/s batch could run up to 1239.7 watts. which simply means to me that running a 1200 watt (on 110 volt) would mean the APW 3++ would be running at just over max capacity the whole time. This does not seem like a good idea to me, especially when running a S9 that cost a few thousand $.
This leaves me pretty convinced that I would not be comfortable hooking up a APW3++ to an S9 on a 110 volt line.
Then I have heard that a 1600 watt power supply that can be used with the S9 is a EVGA 1600 watt max power unit. However after digging into the specs of this unit it indicates similar specs as the psu from bitmain.
So this might mean that the EVGA 1600 watt is actually max 1600 watts on 230 volts or 240 volts and might be less on 120 volts. I can't find any clarity on whether or not the 1600 watt evga psu will put out 1600 watts on a 120 volt. Only a chart on the evga site that says the input range is 115 - 240 VAC, 17-10A, 50 - 60 Hz. So I really need to see a spec that says on 120 volt it puts out 1600 watts. The only info out there is in forum posts and videos whereas seeing it on a spec sheet from evga would be better. According to some videos and posts the psu works with the S9.
And if it was to draw the max, bitmain says it will draw max of 1509.2 watts after adding 10% to the specs. So according to this chart from home depot it would need to be on a 20 amp 12 gauge wiring to be safe. The 12 gauge wiring is recommend to have a max average of 1920 watts (80 % of the max). The range listed on evga website is 120 volts and 17 amps to 10 amps which would be a max of 1955 watts if it uses 17 amps when hooked up to 120 volts.
So after all that, I have 3 questions for evga.
- How many maximum amps will the psu use on 120 volts?
According to the manual:
115-240 VAC, 17-10A, 60/50 Hz
- Will the psu produce 1600 watts using 120 volt line?
According to the Evga T2 1600 Watt Manual, the psu will put out 1600 watts on a 115 Volt line.
Thank you for purchasing the EVGA SuperNOVA 1600 T2 power supply. This power supply features 1600 watts of continuous power delivery with 94% (115V) efficiency and exceptionally clean voltage output. What does that mean? The best stability, reliability, overclockability, and unparalleled control. The SuperNOVA 1600 T2 is the
ultimate tool for powering today's and tomorrow's biggest and toughest systems.
The SuperNOVA TITANIUM series has outstanding electrical performance with ultra stable voltage and extremely clean power output. This can help you achieve the highest possible overclock (optional) and provide the most stable and reliable power to all components. The SuperNOVA TITANIUM series also has high efficiency greater than 94% (115V) and is 80 PLUS TITANIUM certified.
And lastly the details of the power supply in London Ontario Can be found here.