Randy Kramer wrote: > g wrote: > > >> to determine power requirements, check labels on back of equipment for voltage >> >> and amps ratings. multiply volts x amps = va load to determine require ups. >> >> > > > That works, but it is "conservative". > I may have a special case in that I am mostly concerned with riding > through very short outages -- 1 second to say 1 minute. I have a 300 VA > Conext UPS (I got it from Staples for about $10 after a $20 rebate, > IIRC). I'm running 3 computers on it (main boxes only, not the monitor) > and am surviving the short outages I occasionally get. Some day I'll > pull the plug and time how long the three computers stay up. > I just looked at a 200 Watt computer power supply from my junkbox -- the > label says it uses 5 amps at 115 volts (575 volt amps (VA)). It is > probably not a modern switching power supply, which I assume would have > a lower power requirement, but, the three computers I mention above have > power supplies of 300, 230, and 200 watts (IIRC), so presumably the > labels will add up to at least a "requirement" of 730 volt amps. Since > I am running those three on a UPS rated at 300 VA, there is some > conservatism in the calculations. > > PS: The Conext has an indicator light to indicate if the plugged in load > is beyond the rating of the UPS (even while the UPS is running off the > mains) -- it is not on, and I've never seen it on. > > regards, > Randy Kramer > > > > > > I don't know whether this is right, but I have on this ring main 4 computers, off hand I think they are mainly averaging 300w power supply each, which means when all 4 are on I have to protect 1200w , but most of the time I would say 2 computers run on more or less continuously, which suggest I need something less than 1200w, but , it would be sods law that the one time all 4 are running I'm not around to turn a few off when it matters. So I guess the only sure thing is to have overkill built in.
I'm beginning to count the thunerstorms cost, I suspect one of my modems has been cooked. It's not disfunctional but already by substitiution I have assertained it has become seriously damaged. My ISP allows at best 4kbyte/sec download speed(yes I know it's awful) and upon first connection to download file at best I'm getting 1.5kbyte, within 1.5 minutes that has dropped to just 25bytes/second, which is useless, question is , is it the modem or my ISP, at first all pointed towards ISP, then as I say by substitution with a new modem I'm back to sustained 3.5/4.0kbytes/second.I should imagine there has been a voltage surge on the telephone line caused by the storm, and it has damaged some of the chip circuitry.Not enough to kill it, but enough to damage the chip or some other component. I'm still being cut off an average of 20minutes So you see I'm already �30 / $48 down the pan.On the otherhand it might of been a whole lot worse.Any one of those mobo's might of been fried, a processor blown.or indeed a powersupply crisped. I'm thinking the risks justfy some eliment of expenditure here, but I haven't made up my mind what. In England the risks are not high all the time , but they come once in a while and can do serious damage, and often when you least expect it. PS 16.40hrs Now here is a funny thing. That malfunctioning modem mentioned above, well , I connected it back into the computer where the substitute modem came from , and would you adam and eve it , it's downloading at 4.0/4.5kbytes/second. Why should merely swapping them over right a malfunction ? John -- John Richard Smith [EMAIL PROTECTED]
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