Pure Sine Wave UPSes for New Dell PCs
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From: Brian K on 11 Apr 2010 06:00 Not that I'd do this but for my information could you run a 1500 watt heater plugged into the battery side of a 500 watt UPS. I understand nice things wouldn't happen if there was a power failure but would the heater run while there was power?
From: RnR on 11 Apr 2010 07:33 On Sun, 11 Apr 2010 10:00:18 GMT, "Brian K" <remove_this(a)hotmail.com> wrote: >Not that I'd do this but for my information could you run a 1500 watt heater >plugged into the battery side of a 500 watt UPS. I understand nice things >wouldn't happen if there was a power failure but would the heater run while >there was power? > "Great question" because for one, anyone might forget what the UPS rating is or might not realize what the item being used is drawing. My hope would be that in the event of a power failure, it would stop immediately having over powered the UPS and with no interuption of power just draw from the outlet. Of course I'm just guessing so I will hope someone with more knowledge can answer this. Any EEs here? Here are some links which may or may not help you and others about UPSs : http://www.atpm.com/13.02/ups.shtml http://www.jetcafe.org/~npc/doc/ups-faq.html
From: RnR on 11 Apr 2010 07:46 On Sun, 11 Apr 2010 06:33:33 -0500, "RnR" <rnrtexas(a)gmail.com> wrote: >On Sun, 11 Apr 2010 10:00:18 GMT, "Brian K" <remove_this(a)hotmail.com> >wrote: > >>Not that I'd do this but for my information could you run a 1500 watt heater >>plugged into the battery side of a 500 watt UPS. I understand nice things >>wouldn't happen if there was a power failure but would the heater run while >>there was power? >> > > >"Great question" because for one, anyone might forget what the UPS >rating is or might not realize what the item being used is drawing. > >My hope would be that in the event of a power failure, it would stop >immediately having over powered the UPS and with no interuption of >power just draw from the outlet. Of course I'm just guessing so I >will hope someone with more knowledge can answer this. >Any EEs here? > >Here are some links which may or may not help you and others about >UPSs : > >http://www.atpm.com/13.02/ups.shtml >http://www.jetcafe.org/~npc/doc/ups-faq.html Here's another link which tries to answer your question .... http://www.ptsdcs.com/whitepapers/12.pdf I get the impression there is more than one answer depending on the type of UPS used ... can anyone confirm this?
From: Al Dykes on 11 Apr 2010 09:12 In article <S4hwn.18717$pv.2973(a)news-server.bigpond.net.au>, Brian K <remove_this(a)hotmail.com> wrote: >Not that I'd do this but for my information could you run a 1500 watt heater >plugged into the battery side of a 500 watt UPS. I understand nice things >wouldn't happen if there was a power failure but would the heater run while >there was power? > This post is a flashback for me. Nearly 30 years ago I bought a UPS good for 80kVA for 30 minutes. Part of the acceptance test was simulating 80kVA of load with the biggest dummy load you've ever seen. -- Al Dykes News is something someone wants to suppress, everything else is advertising. - Lord Northcliffe, publisher of the Daily Mail
From: who where on 11 Apr 2010 21:26
On Sat, 10 Apr 2010 23:04:23 -0500, "William R. Walsh" <newsgroups1(a)idontwantjunqueemail.walshcomptech.com> wrote: >Hi! > >> I think you are deescribing the"Kill-A-Watt". > >That's one (and it's the one I happen to have). There are some others that >are stocked by major electronics and parts dealers, sometimes under a >private label. > >> I know of a case where a UPS wouldn't supply juice if it wasn't >> plugged into the utility mains. It was a "field day" exercise and the >> intent was to power a WiFi repeater off the grid. > >That might be a safety concern (floating ground) or perhaps the unit was not >cold start capable. Not all UPS units can start up their inverters without >first being on AC power, but most can. Older APC units in particular won't >do this--they must start from AC power first. Indeed. Lately I seem to be the mug that people with ye olde APC units seek out to verify they work before spending on refurbing the battery department. One unit - a 1995 SmartUPS 2000XL - required AC before it would boot, whereas the next series (1999) SmartUPS 2200XL will do a cold start if you know the technique. Why they aren't ALL cold-start-capable beats me. |