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UPS Wattage?

post #1 of 14
Thread Starter 
Hey guys,

I guess this doesn't really fit into the "servers" section but I figured it would make most sense to ask here.

I have a computer (in my signature) with a 1200W PSU and 2xSSDs. I'm getting quite pissed because I keep losing power in my room due to poor electrical circuitry. Right now I am looking at getting a UPS just to allow my computer to shut down safely each time this happens.

Do I need to get at least a 1200W UPS just in case? I'm not sure the actual load of my computer, but if it DID happen to reach say, 1150W, would I need a 1200W+ UPS or what would happen?

Thanks!
post #2 of 14
well since your rig uses about 400w less or more i would say you dont need even close to 1200w ups
    
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post #3 of 14
Quote:
Originally Posted by microman;14453162 
well since your rig uses about 400w less or more i would say you dont need even close to 1200w ups


the important thing to ask is how long do you expect the computer to run while on the UPS... like 3 minutes just so you can exit your game and let it power down ??
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post #4 of 14
i think he is just looking for enough time to shut it down.
    
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post #5 of 14
Thread Starter 
Quote:
Originally Posted by microman;14453234 
i think he is just looking for enough time to shut it down.

Yeah I mean ideally I would like to just have a UPS that would allow it to shut down properly instead of instantaneously pooping on both my SSDs.

I'm listening if you have any suggestions otherwise though.
post #6 of 14
Quote:
Originally Posted by cyanmcleod;14453190 
the important thing to ask is how long do you expect the computer to run while on the UPS... like 3 minutes just so you can exit your game and let it power down ??

nope - that's irrelevant. The power rating of the UPS has nothing to do with the battery autonomy that it provides. Any decent UPS will tell you it's rated power capacity in VA, the battery capacity in Ah and the expected autonomy at several loads in minutes.

OP - you need to work out the max draw of everything off the UPS, and buy something that meets those requirements. You don't need to match the power capacity of your PSU, but be aware that if you exceed the capacity of the UPS it will hard power off your system. So if you ever intend to use that 1200W PSU to it's full capacity you should buy a UPS rated to match it. If you don't expect your power draw to get that high then you can go for something a little lower.

It's also worth pointing out that UPSes are usually rated in VA, not Watts. Put simply this just means you need to de-rate the UPS by 10% or so for a modern, active PFC PSU load, or by more (sometimes much more - 50% and up) for older, non-PFC supplies.
post #7 of 14
What's really important when looking at UPS's is the VA rating, NOT the watting rating.

You need to use a kill-a-watt or something like that to measure your PSU under load.

At the end of the day I would tell you to get something like this:
http://www.newegg.com/Product/Product.aspx?Item=N82E16842102048&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&AID=10446076&PID=2339666&SID=

Here is a review of the lower power end one.
Just remember to power a high end system under load isn't going to be cheap, and with at HOME end UPS setup it will only last a few minutes.
http://benchmarkreviews.com/index.php?option=com_content&task=view&id=20&Itemid=1&limit=1&limitstart=4

If you want to keep gaming while power is out you need to get something that can scale, or Enterprise level UPS with Battery banks, or something like this:
http://www.newegg.com/Product/Product.aspx?Item=N82E16842101484
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post #8 of 14
Quote:
Originally Posted by this n00b again;14469581 
What's really important when looking at UPS's is the VA rating, NOT the watting rating.

You need to use a kill-a-watt or something like that to measure your PSU under load.

At the end of the day I would tell you to get something like this:
http://www.newegg.com/Product/Product.aspx?Item=N82E16842102048&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&AID=10446076&PID=2339666&SID=

I can personally vouch for these. They are great and we have about 10 of them . They all work. Never got a doa, never had an issue. These are by far the best value UPS you can get from newegg.
post #9 of 14
Quote:
Originally Posted by this n00b again;14469581 
What's really important when looking at UPS's is the VA rating, NOT the watting rating.

You need to use a kill-a-watt or something like that to measure your PSU under load.

I have one of those Cyberpower UPS also, 1 step down from the one you recommended, going good after probably about 3 yrs of use so far. They tend to be a bit cheaper than APC's which are usually the most recommended, as they have excellent record for quality, but my cyberpower has held up very well itself.

Can you explain about the VA rating though? I just went off the wattage rating before.
post #10 of 14
VA is what we call apparent power.
Watts is what we call True Power.
The ratio of watt to VA is what we call PF.

Generally in the US Most manufacturers assume the PF is 60% in other words .6

This explains why a 1000VA UPS is normally rated around 600 watts.
Of course this varies according to manufacturer.

So lets say you have a Computer that draws 10 Amps from the Mains of 120 Volts.

The input power for the PSU is 120V * 10A = 1200 VA with 1200 *.6= 720 Watts.

Meaning you need to get a UPS that's rated for AT LEAST 1200VA 720 watts.

You want to measure the Computer while it's under load.
And remember a ups at FULL Load will only last around 2-3 Minutes.
So if you needed 1200VA / 720- Watts and had exactly that UPS it would probably provide about 2 minutes of backup time.
If you had a UPS rated at 2400VA / 1440 watts it would last around 6-10 Minutes.

^ of course the above are just rough numbers, actual performance will vary.

Also avoid Cheap UPS as they will not output a PURE sine wave. A PSU with Active PFC looks for a pure sine wave, and cheap consumer marketed UPS' either have a squared or stepped up wave.
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