A company I once worked fro was a dealer for Best Power
(http://www.bestpower.com) who made on-line UPS systems...  they worked
that way.  They also make the FERRUPS line, which IIRC uses a
ferroresonant transformer in the input stage.  Kick-butt UPS boxes at the
time, don't know what they're doing now.

Dale
--
"Curiosity is the very basis of education and if you tell me that
curiosity killed the cat, I say only the cat died nobly."
          - Arnold Edinborough


On Thu, 29 Nov 2001, Douglas Butler wrote:

> I have found it hard to get any good data on UPSs.
>
> Our gear consists largely of big electric motors and computers.
> Sometimes we have to run off of generators.  Sometimes the generators
> quit unexpectedly.  As the motor load varies wildly, the line voltage
> may spend 10% of the time out of spec.  This seems to rapidly kill a
> garden variety UPS.  We have had to put a ferroresonant transformer
> before the UPS to protect it.  This service doesn't just damage the
> battery, it kills the electronics.
>
> I have heard rumors of a UPS architecture that always runs off the
> batteries, and has a charger that charges the batteries whenever the
> incomming power is acceptable.  This sounds like what we need but I
> haven't found anyone who makes these in small (1kW) sizes.
>
> Sherpa Doug
>
> > -----Original Message-----
> > From: Martin Wehner [mailto:martin@CYCLOTOMIC.COM]
> > Sent: Wednesday, November 28, 2001 11:55 AM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: Re: [OT]: Why I Hate Marketing Departments (was
> > PCMCIA 802.11b)
> >
> >
> > Hello Dale-
> >
> > I know this is going further and further off-topic, but I
> > couldn't resist
> > posting this message.
> >
> > I myself am looking into purchasing a UPS system for my
> > computers and wanted
> > to find out what brand you are using now.
> >
> > Also: when did you have these problems with APC? I cannot
> > find the information
> > now, but thought I had seen quite a bit of detailed
> > information in (possibly)
> > a manual for one of their SmartUPSs?
> > Maybe they did catch the drift that people were going with
> > the competitor's
> > product because of their lousy support?!
> >
> > I would greatly appreciate hearing about your experiences
> > with the vendor you
> > have chosen to go with.
> > Do they have better support for your OS? How do the UPSs
> > compare to the ones
> > you used to have previously?
> >
> > If you do not wish to post this information to the List, but
> > would still like
> > to share your experiences, please feel free to contact me directly at
> > martin@cyclotomic.com
> >
> > Thanks in advance for any information!
> >
> >         Martin
> >
> >
> >
> > On Tue, 27 Nov 2001 20:30:10 -0600 Dale Botkin wrote:
> > > I've seen this in action, and it's enough to make a simple-minded
> > > engineering type want to start swinging a hammer, let me
> > tell you.  The
> > > first time was when I tried to get a UPS from a well-nown
> > vendor to work
> > > with my BSDI system.  They had software for (shudder)
> > Windows, Novell and
> > > SCO, nothing else.  Took six months and an iron-clad NDA to
> > get a floppy
> > > out of them.  Turns out the whole thing was a total
> > no-brainer...  but of
> > > course we were prevented by the NDA from telling anyone
> > that.  Of course
> > > this meant that MOST people with BSDI systems were buying
> > UPS systems from
> > > their competitors...  the fact never quite registered with
> > them.  We quit
> > > buying APC^h^h^h -- er, that vendor's UPS systems -- after that.
> >
> >
> >
> >
> > -------------------------------------------
> > Martin Wehner
> >
> > e-mail: <martin@cyclotomic.com>
> > web:    http://www.cyclotomic.com/~martin
> > -------------------------------------------
> >
> > --
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> > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
> >
> >
> >
>
> --
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>

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