*BSD News Article 69329


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From: John Lucas <jlucas@uvi.edu>
Subject: Re: need comments on Uninteruptable Power Supply
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References: <Pine.HPP.3.91.960519000056.20746A-100000@bluejay.creighton.edu> <Drn7JM.IxD@ritz.mordor.com><Pine.HPP.3.91.960519000056.20746A-100000@bluejay.creighton.edu> <Drn7JM.IxD@ritz.mordor.com> <Pine.HPP.3.93.960522022708.8039C-100000@bluejay.creighton.edu> <4o3me3$op7@nadine.teleport.com>
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Date: Fri, 24 May 1996 20:39:02 GMT
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Rob Saker wrote:
> 
> In message <Pine.HPP.3.93.960522022708.8039C-100000@bluejay.creighton.edu> -
> Psycho Bob <honge@creighton.edu> writes:
> 
> :>Of course, it's the price that's attractive. I'm thinking of buying
> :>several. One of the personal replies I got said the unit is indeed good,
> :>but he's not too well conversed in UPS to know what kind sine wave it
> :>produces -- he just quoted me the items in manual. I have looked for UPS
> :>from both APC and Tripp Lite, but couldn't recall about sine distortion in
> 
> Here's a bit more $0.02 worth to cloud the issue. I've had a handfull of APC's
> (SmartUPS 600, 1200, 2000) for over 3 years now and they're still running
> fine.....
> 
> On the other hand, I understand that these (and the TrippLite's) have clamp on
> protection versus the UPS's from Best, which have the AC running through the
> power converter at all times for an absolutle clean signal.
> 

I missed the start of this thread, but I would like to endorse the Best "Ferrups"
UPSes. Here in the islands, the power is truly atrocious and a real test of UPS
reliability. After hurricane Hugo (1989) we had a Best 5KVA unit that sat out in
the *rain* for two years (building partially blown away) and except for a battery
replacement (unit was trapped by debris surrounding the building it lived in).
Another time this same unit had it's main logic board zapped by our crack physical
plant personel *arc welding* on the input circuit (really), but the equipment it
was protecting suffered no hurt. After hurricane Marilyn (1995), the entire
University operated off a diesel generator for 2 months (try that sometime). The
ferroresonant technology employed by Best acts as a line conditioner/voltage
regulator even if the battery is dead. Frequency shifts (ferroresonant's Achilles
heel) are normally handled by going over to inverter, no worries about voltage
spikes/sags there.

Before moving to St. Thomas I worked at Oregon State University for 8 years and in
that time we had one power outage. In St. Thomas we have experienced outages as
frequent as 30/month (it is better these days). There have been spikes that would
curl your hair, and brownouts are also common. In these conditions, you separate
the lambs from the goats when it comes to UPSes. I bet on Best units for anything
larger than 400VA. At GSA prices they cost about $1/VA; cheap when you consider
what the power company and/or mother nature can do to your equipment.

Clean power is for wimps :-}

-- 
| John Lucas                          jlucas@uvi.edu                 |
| Information Technology              NIC Handle: JL423              |
| University of the Virgin Islands    (809) 693-1216                 |
| St. Thomas, VI 00802                http://www.uvi.edu/jlucas.html |