UPS Recommendations: was Re: Power supply recommendations

[Roger Oberholtzer]

It depends on what is attached to the UPS. We use UPS in our measurement
vehicles. So that the 12 volt supply (via a nifty Electrolux device
called a 'travel power', which can provide up to 6000 volts) is inverted
into 220 volts, which is fed into the UPS, from which we get power. The
main concern for us are power quality (not a concern to the average home
user - but a big concern to us mobile folk) and switching 'cleanliness'.
So we use a UPS that is non-switching (a.k.a. on-line). That means that
the devices always run off the UPS batteries (a cleaner, less spiky
power source), which are recharged as long as there is power. In a
switching UPS, the device runs off the mains and is switched to the UPS
in the event of a power failure. In the switching UPS, there can be a
small power glitch when the switch happens. If this is a problem or not
depends on the equipment being powered. Another advantage of a
non-switching power supply is that you are protected from surges and
dropouts as well as all out power loss because you are always running
off the batteries. The down side is that a non-switching/on-line UPS
costs more. But you get more than just a UPS.

We use IMV Victron UPS, which are now owned by General electric
(http://www.gedigitalenergy.com/). They are quite reliable. And of
excellent quality.

On Tue, 2004-11-23 at 18:50, Leon Goldstein wrote:
> David Bandel wrote inter alia:
> 
> >Unfortunately, I see the same trend in UPSs.  The dampeners and
> >regulators (power supply geeks might call them zener diodes, etc., but
> >to most of us they're just filter components) have also been removed
> >from UPSs making them little more than batteries.  And while batteries
> >(which are really just big capacitors) dampen surges somewhat, as do
> >isolation transformers, etc., the new battery USPs aren't running off
> >the batteries all the time so the big dampeners are effectively not in
> >the circuit at the most critical times.
> >
> >That's how you make cheap power supplies and UPSs.  By removing
> >"unnecessary" components.  Funny how those components were necessary
> >when the supply was originally designed, but now aren't.
> >
> Any recommendations or preferences from among the currently available 
> UPS offerings?
+????????????????????????????+???????????????????????????????+
? Roger Oberholtzer          ?   E-mail: roger at opq.se        ?
? OPQ Systems AB             ?      WWW: http://www.opq.se/  ?
? Nybrogatan 66 nb           ?    Phone: Int + 46 8   314223 ?
? 114 41 Stockholm           ?   Mobile: Int + 46 733 621657 ?
? Sweden                     ?      Fax: Int + 46 8   314223 ?
+????????????????????????????+???????????????????????????????+