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DC current to computers' PSUs?

Von: abu (abuabi@abeabo-net.it) [Profil]
Datum: 01.05.2008 22:39
Message-ID: <481a2a9d$0$87938$892e0abb@auth.newsreader.octanews.com>
Newsgroup: alt.engineering.electrical
Hi all,
would the PSU of a computer work if I'd provide 220V DC current to it?

If yes: why everybody wants an expensive sinusoidal UPS, with a big
expensive inverters in it, instead of using some 20 car batteries in a
series (+ a rectifier to keep the charge), in parallel to the computers?
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