PSU with UPS support

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napster100

napster100

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Hi guys, I was wondering if you can get a Power Supply Unit with Uninterruptable Power Supply built in? If so could you post a link to a few?

Thanks!!
 
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byza

byza

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Given that UPS aren't the smallest devices around, I don't see one being a size that makes sense to put in a computer, and as Someone Somewhere said, the heat would be a problem too.

You need to make sure that your UPS is going to have adequate W/VA to power everything, otherwise you'll still shut off if you're under load.
 
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napster100

napster100

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Would you have any UPS units you could suggest? I don't currently have the rig I'm intending to use it for but I'm planning on building one for university... It will be needing a 700W PSU if that helps, I'm just wanting fail safe solutions :)
 
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byza

byza

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The rig is more important than the PSU as the PSU only draws what it requires to power the rig, it doesn't draw the full wattage all the time. According to some UPS companies there are PSU's that draw the full wattage when the initial switch happens, but i've never heard of a specific PSU that does this so i'm inclined to believe that it's to get you to buy a higher powered UPS than you need.

I'm pretty much pulling this number out of thin air but a 1000VA/600W will probably do the job for you.
 
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napster100

napster100

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Cool thanks, I'll look around. Would it matter if I picked a higher wattage than I needed? I'm just thinking about in the future I may add additional hardware like another solid state or more HDDs as an example, I know those are quite low wattage but I may get several or say a newer CPU if a new one is made for that socket which I will expect there to be... But anyway its a £2,000 GBP rig (no idea of the US equivalent, and no idea if your from there haha) but anyway I'm not going cheap on it so I'm not going really cheap on the UPS unit either, I want a rig that will last a long time and powerful enough for what I need :)
 
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Someone Somewhere

Someone Somewhere

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Big question is if you actually need it in the first place. Unless the power is seriously unreliable, IMHO it's unnecessary. Only thing they save you from is data loss and corruption, and having to reinstall windows (which happens in a very small fraction of cases, anyway). Unless it's mission-critical or goes out every few days, I'd ignore it.
 
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Cristi72

Cristi72

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Hello,

If you need an UPS, please post your system' specs to see what power draw the system has.

When calculate the UPS necessary power, firstly you must know exactly what PSU do you have, and especially the efficiency. For example, if you have an 700W PSU with an 80% efficiency at full load, your PSU will draw 700(W)/0.8 (eff.)=875 Watts. You must now convert the W in VA (active): 875*sqrt(2)=875*1.4142=1237.5 VA, so at least an 1200VA UPS. If you add also the monitor(s), an 1300 - 1400VA should be plenty.
 
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byza

byza

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If you get higher wattage than you need it will just last a little longer than advertised.
As Someone Somewhere said, you should evaluate whether you really need one. A lot of people in India get them as the power supply over there can be unreliable. Sometimes it only switches off for a few seconds but it can happen frequently so they need UPS' so their computers aren't constantly shut off. I can't imagine it's much of an issue in the UK and on the off chance that there is a power outage you're going to be pretty safe, just make sure you get a decent surge protector.
Chrisi72 has has given you the eqn so you can work out what you need yourself if you decide to get one, just remember to look at the efficiency vs the max draw of your rig, not the PSU, as in most cases people get PSU's far larger than they need, and the increase in VA/W to price is quite significant.
 
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