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From: hoffman@pitt.UUCP (Bob Hoffman)
Newsgroups: net.periphs,net.news.sa
Subject: Re: uninteruptable power supply for a VAX
Message-ID: <914@pitt.UUCP>
Date: Fri, 7-Jun-85 12:49:00 EDT
Article-I.D.: pitt.914
Posted: Fri Jun  7 12:49:00 1985
Date-Received: Sun, 9-Jun-85 02:11:20 EDT
References: <1218@cbosgd.UUCP>
Reply-To: hoffman@pitt.UUCP (Bob Hoffman)
Organization: Univ. of Pittsburgh Computer Science
Lines: 31
Xref: watmath net.periphs:787 net.news.sa:119

Our computer center has just purchased an Exide 413KVA, 208v, 3 phase UPS.
In case you don't know, KVA is KiloVoltAmperes, a power measurement
that doesn't take the power factor into account.  For PF=0.8,
413KVA = 330 Kilowatts.  The cost (including installation) will be
about $130K.

This monster has a roomful of lead-acid batteries behind it and it
will keep the following equipment running for about 15 minutes:

	1	VAX 8600
	4	VAX 785s
	1	VAX 750
	1	VAX 730
	5	DEC KL-10s
	1	NAS 8053
	22	Magtape drives
	dozens	Disk drives (RP06, RA81, Eagles, u-name-it)

We don't have a diesel generator, but it wouldn't be too hard to
add one.  400+ KW diesel generators aren't cheap, though.  We can't
justify the cost.  In any case, I believe that this UPS would run your
(single) 780 for a relatively long time.

If you're in the market for a large UPS, you may be interested in
the one we're replacing.  It's also an Exide, and has a capacity
of 250 KVA, 208v, 3 phase.  It's about 11 years old, has enough spare
parts to carry you to the year 2000, and has a complete maintenance
history available.  Batteries not included!  First $25K takes it.
-- 
Bob Hoffman, N3CVL
Pitt Computer Science