UPS
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From: MS on 19 May 2010 17:12 Hi all, I have a Core 2 Duo E8500, 2x2048 DDR2 1066, Raid 2x Samsung 7200 rpm and a 4850 from Powercolor. The PSU is a chieftech 360W. The system works normaly. The question is: an Uninterruptible Power System (Phasak PH9920) with a output of 2000Va (1080 W) should sustain my system during power cut for how many minutes? Also the UPS will have to support a 20"LCD monitor. Note : in Idle mode
From: Charlie Hoffpauir on 19 May 2010 20:29 On Wed, 19 May 2010 22:12:51 +0100, "MS" <MANUEL.SILVA(a)MEGAMAIL.PT> wrote: >Hi all, >I have a Core 2 Duo E8500, 2x2048 DDR2 1066, Raid 2x Samsung 7200 rpm and a >4850 from Powercolor. The PSU is a chieftech 360W. The system works normaly. >The question is: an Uninterruptible Power System (Phasak PH9920) with a >output of 2000Va (1080 W) should sustain my system during power cut for how >many minutes? Also the UPS will have to support a 20"LCD monitor. > >Note : in Idle mode Although I'm not familiar with that UPS, I'll comment that it is entirely dependent on the battery in that unit. Both the capacity of it (in Amp-Hrs) and the age and condition of it. In general, these batteries will last about 3-5 years, and capacity will decrease depending on how they are used (or abused) during that time. Your best way to determine the sustaining time for your system is to actually test it with your UPS. However, don't allow the UPS battery to go completely "flat" because that damages the cell and so reduces the capacity. My APC units have a display that indicates remaining time (an estimate, but useful). Double check that by actually timing the time it takes to reach 50% of the time it initially displayed. -- Charlie Hoffpauir Everything is what it is because it got that way....D'Arcy Thompson
From: Paul on 19 May 2010 23:23 MS wrote: > Hi all, > I have a Core 2 Duo E8500, 2x2048 DDR2 1066, Raid 2x Samsung 7200 rpm > and a 4850 from Powercolor. The PSU is a chieftech 360W. The system > works normaly. The question is: an Uninterruptible Power System (Phasak > PH9920) with a output of 2000Va (1080 W) should sustain my system during > power cut for how many minutes? Also the UPS will have to support a > 20"LCD monitor. > > Note : in Idle mode The parameter of interest is called "run time". It is not stated on the phasak.com web site, so it is not possible to say how long the system will remain running. You will have to contact Phasak, to get the necessary information. Find a manufacturer with more detailed specifications. For example, take a look at this page. There is a 2200VA unit here. Now scroll down to the "run time" graph. When a 500W load is present on that UPS, the run time is 66.9 minutes. http://www.apcc.com/products/resource/include/techspec_index.cfm?base_sku=SMT2200 (Runtime graph - close up view) http://www.apcc.com/products/runtimegraph/runtime_graph.cfm?base_sku=SMT2200&chartSize=large Your electrical load is: idle busy 65/0.90 = 72W into Vcore for CPU 6W 72W 50W motherboard plus RAM 50W? 50W 12W per disk drive times 2 24W? 24W CD/DVD 12V at 1.5A, 5V at 1.5A 7.5W 25.5W Fans 6W 6W USB loading 10W 10W HD 4850 video ** 41W 115W 20inchLCD 40W 40W Total 184.5 342.5 ** http://www.xbitlabs.com/articles/video/display/sapphire-toxic-hd4850_5.html#sect0 Using the example runtime graph for the SMT2200, and using a 184.5W idle computer loading, gives a runtime of 3 hours. That is a function of the size of the battery, how efficiently it can be discharged via presenting a small load, and the conversion efficiency of the inverter inside the UPS. Charlie Hoffpauir mentions the "amp-hours" of the battery. If you could get a specification for the internal battery of the Phasak PH9920, and compare it to the amp-hours of the SMT2200, you would get some idea of how much comparable run time you might get. APCC uses a rating called volt-amp-hour or VA-hour for the battery. The SMT2200 claims to use an RBC55 battery pack, with a volt-amp-hour rating of 816. In the above example, the run time graph predicts a 184.5W load can run for 3 hours. 3 * 184.5 = 554 volt-amp-hour. So the SMT2200 gets about 68% of the power stored in the battery. If you can get a battery volt-amp-hour rating for the Phasak PH9920, you could estimate the run time by taking 68% of the battery rating, then dividing by 184.5 to get run time in hours. The "2200VA" refers to the maximum load you can connect to the UPS. That would be like connecting an electric toaster. If you connected a toaster and ran it from the UPS, you'd get anywhere from 7 minutes to 20 minutes run time. Which is enough time to make some toast. Your computer represents a more moderate load, so the UPS will have a much longer runtime with it connected. Paul
From: Mike Tomlinson on 20 May 2010 07:07 In article <4bf45461$0$11618$a729d347(a)news.telepac.pt>, MS <MANUEL.SILVA(a)MEGAMAIL.PT> writes >I have a Core 2 Duo E8500, 2x2048 DDR2 1066, Raid 2x Samsung 7200 rpm and a >4850 from Powercolor. The PSU is a chieftech 360W. The system works normaly. >The question is: an Uninterruptible Power System (Phasak PH9920) with a >output of 2000Va (1080 W) should sustain my system during power cut for how >many minutes? Also the UPS will have to support a 20"LCD monitor. Your system unit will draw 120-150W at idle (a lot more when it's running full pelt), the monitor, depending on its age, another 50-60W. Let's say 200W total. So for a 1kW UPS you might expect a 5 hour run time. But it's not this simple. It depends on the battery condition and level of charge, how efficient your power supply is, and if you research the UPS spec you may find it's not rated for 100% duty cycle. The APC site suggests that for a 200W load on its 2200VA Smart UPS, you would get a run time of 3hr 6min, the 1500VA 1hr 24min. The UPS you're looking at, being 2000VA, will fall somewhere between those two, and realistically, you should halve that time to allow for battery condition and PSU inefficiency. I would strongly recommend paying a little more for an APC unit (www.apcc.com) over some cheap brand. That Phasak looks OK but I've never heard of them. Also be aware that the batteries are regarded as a consumable item, you'll need to replace them every three to four years to maintain the runtime at a reasonable level. -- Mike Tomlinson
From: John Doe on 20 May 2010 08:19 Mike Tomlinson <mike none.invalid> wrote: > MS <MANUEL.SILVA MEGAMAIL.PT> writes > >> I have a Core 2 Duo E8500, 2x2048 DDR2 1066, Raid 2x Samsung >> 7200 rpm and a 4850 from Powercolor. The PSU is a chieftech >> 360W. The system works normaly. The question is: an >> Uninterruptible Power System (Phasak PH9920) with a output of >> 2000Va (1080 W) should sustain my system during power cut for >> how many minutes? Also the UPS will have to support a 20"LCD >> monitor. > > Your system unit will draw 120-150W at idle (a lot more when > it's running full pelt) If it really matters, spend $20 US on a Kill-A-Watt and find out, instead of making silly guesses. -- > , the monitor, depending on its age, another 50-60W. > Let's say 200W total. > > So for a 1kW UPS you might expect a 5 hour run time. But it's not this > simple. It depends on the battery condition and level of charge, how > efficient your power supply is, and if you research the UPS spec you may > find it's not rated for 100% duty cycle. > > The APC site suggests that for a 200W load on its 2200VA Smart UPS, you > would get a run time of 3hr 6min, the 1500VA 1hr 24min. The UPS you're > looking at, being 2000VA, will fall somewhere between those two, and > realistically, you should halve that time to allow for battery condition > and PSU inefficiency. > > I would strongly recommend paying a little more for an APC unit > (www.apcc.com) over some cheap brand. That Phasak looks OK but I've > never heard of them. > > Also be aware that the batteries are regarded as a consumable item, > you'll need to replace them every three to four years to maintain the > runtime at a reasonable level. > > -- > Mike Tomlinson > > > Path: news.astraweb.com!border5.newsrouter.astraweb.com!news-out.octanews.net!indigo.octanews.net!news.glorb.com!eternal-september.org!.POSTED!not-for-mail > From: Mike Tomlinson <mike none.invalid> > Newsgroups: alt.comp.hardware.pc-homebuilt > Subject: Re: UPS > Date: Thu, 20 May 2010 12:07:50 +0100 > Organization: None > Lines: 34 > Message-ID: <QFe8mBCGgR9LFwsl none.invalid> > References: <4bf45461$0$11618$a729d347 news.telepac.pt> > Reply-To: Mike Tomlinson <none none.invalid> > Mime-Version: 1.0 > Injection-Date: Thu, 20 May 2010 11:47:00 +0000 (UTC) > Injection-Info: mx02.eternal-september.org; posting-host="JvtVpNFQ/PfiVw1Tsut1WQ"; logging-data="26321"; mail-complaints-to="abuse eternal-september.org"; posting-account="U2FsdGVkX19SUuS9rpRXaPDmzUxzdnXW7Sgt/BOu/so=" > X-Newsreader: Turnpike Integrated Version 5.01 U <FteYrFYDwAqZV0vS36i1lrL3W1> > Cancel-Lock: sha1:ub4v9COZ+ETsbOcrXOZXJ/+Q6QY= >
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