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What UPS for ~40 mins

post #1 of 13
Thread Starter 
I have a Mini ITX build that needs to be up as much of the time as possible, It has an Intel Atom 330, Nvidia ION, and 2 hard disks inside it. I need it to be able to be on for around 30 - 40 mins without mains power.

The electric in my house sometimes goes off when the electricity meter runs out of credit. It takes about 10 mins to get to the shop and back with more credit for the meter. I want the computer to be able to stay up during the time without electric.

Do all UPS units have alarms when the power goes out? What size in VA do i need? What does VA measure?
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post #2 of 13
I dont know much about ups...but with the screen still be on or do you just need it as a server? If you dont need a monitor it would probably last alot longer.
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post #3 of 13
whoa, you have to pay credits for your power?
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post #4 of 13
Thread Starter 
Quote:
Originally Posted by Mr. Stroker View Post
I dont know much about ups...but with the screen still be on or do you just need it as a server? If you dont need a monitor it would probably last alot longer.
Yeah, just the computer. I think that it uses around 50 watts.


Quote:
Originally Posted by Ubernoobie View Post
whoa, you have to pay credits for your power?
Yeah, it works out cheaper than paying a bill every month.
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post #5 of 13
40 minutes or so? I personally use an APC RS 1000VA unit to power my Atom system. It reports a 45-minute runtime, but it's also powering four external USB HDDs in addition to the main Atom (Asrock ION 330) system.
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post #6 of 13
The VA rating of the UPS has nothing to do with how long it will run for. The VA rating is a measure of how much power it can handle - similar to Watts, but because of the way computer power supplies work the VA rating can be much higher than the wattage (I don't want to get technical here as everyone will get lost - but feel free to Google 'power factor' for more info. Bottom line is that your UPS will be rated for a max VA and a max power, and typically the VA rating will be 30-40% higher - so a 1000VA unit will be rated for 600-700W).

In order to determine your runtime you need to check out the battery specs for each unit. Generally higher power (VA) rated UPSes will have larger batteries, but this isn't always the case. The battery size will be listed either as a runtime (which is often done at very low load, so double check how it was measured), or it will be listed in terms of Ah (amp-hours - this is the length of time the battery can produce a 1 amp current for in hours, or the amperage it can output for one hour - although the stat is very synthetic as battery life is dependent on current output, and so halving the current doesn't double the runtime). More Ah = longer run time. If you go to APC's website then you can specify your load and it will tell you roughly how long the battery will last. Some units allow external batteries to be added also to increase runtime. I would spec the battery to last at least double (and preferably much more) than the time you expect to need it for, especially if it is important that the unit never goes offline. You can get the UPS to shut down the PC before it drops power though, so you shouldn't get data loss from a power failure.

This might be a little confusing - sorry for that, but there are many complex variables involved. If you have any specific questions feel free to ask them. Or you could just go to APC.com and choose a UPS...
post #7 of 13
Quote:
Originally Posted by the_beast View Post
The VA rating of the UPS has nothing to do with how long it will run for. The VA rating is a measure of how much power it can handle - similar to Watts, but because of the way computer power supplies work the VA rating can be much higher than the wattage (I don't want to get technical here as everyone will get lost - but feel free to Google 'power factor' for more info. Bottom line is that your UPS will be rated for a max VA and a max power, and typically the VA rating will be 30-40% higher - so a 1000VA unit will be rated for 600-700W).

In order to determine your runtime you need to check out the battery specs for each unit. Generally higher power (VA) rated UPSes will have larger batteries, but this isn't always the case. The battery size will be listed either as a runtime (which is often done at very low load, so double check how it was measured), or it will be listed in terms of Ah (amp-hours - this is the length of time the battery can produce a 1 amp current for in hours, or the amperage it can output for one hour - although the stat is very synthetic as battery life is dependent on current output, and so halving the current doesn't double the runtime). More Ah = longer run time. If you go to APC's website then you can specify your load and it will tell you roughly how long the battery will last. Some units allow external batteries to be added also to increase runtime. I would spec the battery to last at least double (and preferably much more) than the time you expect to need it for, especially if it is important that the unit never goes offline. You can get the UPS to shut down the PC before it drops power though, so you shouldn't get data loss from a power failure.

This might be a little confusing - sorry for that, but there are many complex variables involved. If you have any specific questions feel free to ask them. Or you could just go to APC.com and choose a UPS...
Yes, I know that . I was simply stating the model number of the unit I use...
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post #8 of 13
APC is the best...
    
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post #9 of 13

I've got a CyberPower CP1000AVRLCD (1000VA/600W) and with my system surfing the web, playing music, and doing anything but gaming or watching a movie pretty much, the UPS reports it will keep it on for 10-15 minutes. My system uses about 300-400W during those times as well.

In conclusion, an

or would do you just fine. It'll even keep it on long enough in case you get caught up in traffic, too .
 
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post #10 of 13
why not buy a ups and disasemble it and hook it up to a car or truck battery. Im pretty sure that would last you more than 45 mins and you can find a used ups on ebay for cheap
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