You're assuming that the electronics in the UPS is running at 100% efficiency, using no power of its own. Unfortunately, the UPS circuitry uses (or wastes) some power, and its power usage is not completely dependent on the power being consumed by external devices (computers, etc.). This is the nature of electronic circuitry, and you might not be able to escape the problem without opening a portal into another universe (or something equally unlikely). If you really want long-term use of your system while the main power is off, you might look into setting up a generator power source...but that is definitely getting off topic here. HTH, and have a _great_ day! On Sun, Jan 22, 2006 at 09:18:13PM -0500, Lorenzo Taylor wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > I have been looking for UPS's on the web and notice that they have a listed > backup time. Is this the minimum backup time if it is fully loaded or the total > backup time no matter how much power my computer is using? I find it rather > strange that a UPS that says it will run a 500 watt computer for 50 minutes > wouldn't run a 250 watt computer for 100 minutes. > > Please forgive the off-topic and n00b question. > > Lorenzo > - -- > Be careful of reading health books, you might die of a misprint. > -- Mark Twain > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.2 (GNU/Linux) > > iD8DBQFD1DzlG9IpekrhBfIRAtZ9AJ0R3ClHyaxQyy4zhdka0Hn0e6O8PgCfSJvK > e3mr9fE8vC8Bsynt0OZXEu8= > =S0mn > -----END PGP SIGNATURE----- > > _______________________________________________ > Speakup mailing list > Speakup at braille.uwo.ca > http://speech.braille.uwo.ca/mailman/listinfo/speakup -- Ralph. N6BNO. Wisdom comes from central processing, not from I/O. rreid at sunset.net http://personalweb.sunset.net/~rreid ...passing through The City of Internet at the speed of light! CIRCLE RADIUS = sqrt (x ^ 2 + y ^ 2)
