UPS recommendations for 2x APW3+ 1600w

[NotFuzzyWarm]

<snip>
It could still possibly cost you a few hours of hashing as not everybody is home all of the time when something goes wrong. It's not required but it's also a small hassle when it does happen. I just happen to use UPSes because I have em from servers and they help keep miners up for practically nothing in my scenario.

Exactly. Besides, when I got them I was making BTC hand over fist and since the now-defunct TigerDirect accepted BTC, well, was just the thing to do.

Now 1st place I look is Overstock.com 'cause they take BTC

[damprfield]

I found brand new EATON 9130i Rack Mount 2000 VA 1800 Watt UPSs with 2 yr warranty on eBay for $400. Can't beat that.

[fanatic26]

I found brand new EATON 9130i Rack Mount 2000 VA 1800 Watt UPSs with 2 yr warranty on eBay for $400. Can't beat that.

So you can put one miner on a UPS. You have also increased its ROI time by 3 months. Thats like 1700 hours of hashing to pay for the UPS that will in its lifetime prevent maybe 6 hours of downtime?

I am so not understanding where you people think this is a good idea? Its like you are looking for ways not to ROI

[philipma1957]

I found brand new EATON 9130i Rack Mount 2000 VA 1800 Watt UPSs with 2 yr warranty on eBay for $400. Can't beat that.

So you can put one miner on a UPS. You have also increased its ROI time by 3 months. Thats like 1700 hours of hashing to pay for the UPS that will in its lifetime prevent maybe 6 hours of downtime?

I am so not understanding where you people think this is a good idea? Its like you are looking for ways not to ROI

Well maybe they have terrible power quality.

Here in NJ  they rebuilt a lot after Hurricane Sandy  so I  get 121-122 at mains  and 243 for 240 power.

All my wiring was done by me other then the main box.

My home was built during Vietnam war.  USA was short copper and I had all aluminum wires.  Many 1966-1973 built homes in

NJ  were done with aluminum.  I replaced 100% of the wires in the 90's Well before BTC  came around.

A homeowner in NJ can do their own wiring if they continue to live in the home.

Since I was saving a lot of money DIY  I did every upgrade with better guage wires.

So all my 12 gauge 15 amp circuits are 10 guage 20 amp circuits
I get very little power drop.
I put in a whole house surge protector.

I consider those upgrades to be far better to do then to buy lots of UPS gear.

We can go 6 months with no power failure as the norm.

[VentMine]

For one, get a digital voltmeter. Even a cheap one from a hardware store or whatever will be fine. From measuring the AC line to what voltage a PSU is providing, a meter is a must have.

As for recording sag not sure. I used to just check the AC line during very hot days. Now just consult what the UPS's report

also, what do you consider 'excellent power service', a variance of what %/sag?

Excellent is never dropping more than 5% below nominal. The line going high is rarely an issue for most equipment.

We are in an industrial park at work and have 500KW 480v heavy power so it is pretty damn good. After step-down to 208v for areas that use it like the offices, without dropping a phase completely I think the lowest my monitoring gear there has even seen is 201v - about 1% drop. Also have 75KW backup generator there fed from the natural gas line to keep the front-office, heating/cooling and my miners alive....

Hey NotFuzzy, regarding your back-up power source being a genset, have you ever had to run your miners off of that back-up? I'm curious is there's any power quality issues from a genset that would require some kind of protection for your miners, say a UPS or something in between? I'm curious to know what I will need to consider in regards to design if I also use a back-up genset.

[NotFuzzyWarm]

<snip?
Hey NotFuzzy, regarding your back-up power source being a genset, have you ever had to run your miners off of that back-up? I'm curious is there's any power quality issues from a genset that would require some kind of protection for your miners, say a UPS or something in between? I'm curious to know what I will need to consider in regards to design if I also use a back-up genset.

Yes I've had miners running on the generators both at home and at work with no issues (as expected).

The only power quality issue a generator usually will have is frequency control when large loads like AC or a refrigerator turn on/off (speed of motor changes briefly making freq change) and miner PSU's could care less about it. If the only thing on the genset is miners then the load will be very steady anyway.

As for UPS's - that is another story. Depending on just how much freq changes a UPS may pick that up as a problem and switch over. The brief transfer time may cause another blip in load causing another blip in freq, rinse and repeat. The specific Cyberpower UPS's I use have a generator-mode to address that.

[Flying Hellfish]

Hey NotFuzzy, regarding your back-up power source being a genset, have you ever had to run your miners off of that back-up? I'm curious is there's any power quality issues from a genset that would require some kind of protection for your miners, say a UPS or something in between? I'm curious to know what I will need to consider in regards to design if I also use a back-up genset.

The way I see it you need a pretty damn big farm to justify a UPS and back up generator if it's just for the miners.

In terms of design, I've never seen a back up gen used without also using a UPS but it can be done.  You will have to consider how your going to transfer the load between the gen and utility power. For uninterrupted power you would need an ATS (automatic transfer switch) and UPS.  The UPS holds the load while the gen fires up, when the gen is ready the ATS transfers the load onto the gen.  When utility power returns the ATS moves the load back to normal utility operation.

Always use an online UPS with a generator (as noted above)

No UPS and load drops when utility fails and gen starts up.
No ATS and you will have to manually transfer the load between utility and gen.

Most normal electricians are not qualified for this kind of work, consult and hire a real professional for this kind of work. And lastly do the math and make sure its worth it for mining LOL!!

[NotFuzzyWarm]

Definitely agree with you Hellfish!
For data-critical operations seamless hold-over until the generators come online is essential.

In my example above, since mining can afford to be offline and more casually restarted in a manual orderly manner, not needing the UPS system to say least saves mega $$$.

As for companies qualified for it, Schneider Electric is first to mind. Hell they will even do cooling needs along with designing the buildings...

[braykraft]

Hi All - I have an Avalon A741, T9, and 2x APW3+ 1600w on the way. i'm looking for ~5 min of failover support (enough time to rush over and turn them off normally) and some decent current filtration, even though the brownouts are infrequent and slight, i'm going for longevity. Is it better to have 1x UPS for each or OK to have one big UPS for both? I think i'd rather go with something like APC instead of the cheaper appearing brands?

Thanks!

2x1600 = 3200/120 = 26 amps (RMS) or not this is a lot of power on a normal 14 gauge home wire. Not knowing what you have going as far as a power distribution center as in LOAD CENTER you may want to have a qualified individual check your wire for correct size for the power being drawn through them and all connections in the load center. Drawing that kind of power I would have a separate circuit each - 10 gauge copper on a 30 amp circuit breaker. Connections that run hot as in too small of wires cause connections to become loose over time and unsafe. Have the qualified individual check all neutral wires as in a home wire environment  neutral connections are one of the main spots for intermittent power losses.
Personally I have 2 heavy duty 10 gauge power extension cords from home depot each on a 20 amp circuit for each machine directly from the load center.
This way I don't have to worry about someone plugging in any appliances that may affect my power - Like a hair dryer lol.
 

[QuintLeo]

14 AWG wire is rated for 15 amps MAX by the NEC.
12 AWG wire is rated for 20 amps MAX.

 You need to go to at least 10 AWG.

 It's not practical to use a generator without a UPS unless you are willing to suffer through a short power outage before the generator can kick in, *OR* the generator is running all the time (EXPEN$IVE) and you have a VERY fast automatic transfer switch setup (ALSO expen$ive).



 IMO it's not cost effective to use a UPS on a miner - if your power drops out more than once every couple of months you're going to have issues with mining anyway, as you're probably going to lose your internet connectivity as well fairly frequently.

[smoothrunnings]

Hi All - I have an Avalon A741, T9, and 2x APW3+ 1600w on the way. i'm looking for ~5 min of failover support (enough time to rush over and turn them off normally) and some decent current filtration, even though the brownouts are infrequent and slight, i'm going for longevity. Is it better to have 1x UPS for each or OK to have one big UPS for both? I think i'd rather go with something like APC instead of the cheaper appearing brands?

Thanks!

You should a 30kV UPS and connect it to a gas generator, this way you have endless power.