UPS
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From: John Doe on 20 May 2010 08:33 Paul <nospam needed.com> wrote: > 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 Total bullshit. Have you ever actually measured the wattage your PC uses, Paul? Q9550 Quad core CPU 9800GT ECO 512 MB video card 4x1 GB RAM memory modules six USB devices plugged in 32 GB SDD 150 GB VelociRaptor The whole system, measured from the wall, uses about 100 W when idle, including power supply inefficiency. If it really matters, spend $20 US on a Kill-A-Watt and find out, instead of making silly guesses. Then buy a high quality power supply product that fits your needs. That is really surprising, isn't it? That someone will give advice without really having a clue about the actual power supply requirements of a typical system. Or that some user or overclocker that is interested in spending significant money on a power supply or backup power supply is not willing to spend $20 US to figure out how much his system actually needs. -- > ** 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 > > > Path: news.astraweb.com!border5.newsrouter.astraweb.com!news.astraweb.com!border3.a.newsrouter.astraweb.com!proxad.net!feeder1-2.proxad.net!newsfeed.straub-nv.de!eternal-september.org!.POSTED!not-for-mail > From: Paul <nospam needed.com> > Newsgroups: alt.comp.hardware.pc-homebuilt > Subject: Re: UPS > Date: Wed, 19 May 2010 23:23:37 -0400 > Organization: A noiseless patient Spider > Lines: 77 > Message-ID: <ht29vr$14t$1 news.eternal-september.org> > References: <4bf45461$0$11618$a729d347 news.telepac.pt> > Mime-Version: 1.0 > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > Content-Transfer-Encoding: 7bit > Injection-Date: Thu, 20 May 2010 03:23:39 +0000 (UTC) > Injection-Info: mx02.eternal-september.org; posting-host="5Ctq2gnK5urRyiPYilTthg"; logging-data="1181"; mail-complaints-to="abuse eternal-september.org"; posting-account="U2FsdGVkX1+V3KvTwpddXgiHpahIN0Xp+rDdoTY0qdk=" > User-Agent: Thunderbird 2.0.0.24 (Windows/20100228) > In-Reply-To: <4bf45461$0$11618$a729d347 news.telepac.pt> > Cancel-Lock: sha1:+ASPH/VbXyZ2Q219SY95Es4KrW8= >
From: Flasherly on 20 May 2010 10:06 On May 19, 5:12 pm, "MS" <MANUEL.SI...(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 Idle mode. Minutes. Long enough, although when you say minutes, should be no longer than to run a routine to safety, normally shut down. Also, the idle mode on a monitor defaults to standby, or, in windowese: turn off the monitor (after so many minutes without a mouse/keystroke). Mine are 32/37" flatpanels and up to 600w heavy consumers, so they get treated accordingly (short time allowance shut downs, standby, along with I want the backlite tubes to last). Had a relatively small UPS (APC brandname, think it was). Worked nifty for mainly brownouts, short interruptions on heavy-usage urban grids. Well enough to better shutdown and if not of course it interfaced into the system with automated routines for shutting safely down. Would have been back when using a 19" CRT. Hurricane came one day, then, and I was off the grid two weeks, and the APC never came back up. Just sat there beeping. Got the battery serial# -- no biggie. They sell them in motorcycle shops if I really want it back. OK, but I keep pretty good redundant data and binary backups for when I'm hit hard, though. I see a UPS as more a convenience factor for how much of voltage fluctuations or outages it takes before one begins to pull out one's hair. You can get it from Office Depot and take it back for a refund if you don't like testing what happens when pulling the plug from a live computer.
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