[nSLUG] The least expensive APC UPS, and brown outs

Donald Teed donald.teed at gmail.com
Fri Nov 26 15:47:48 AST 2004


I noticed that Staples advertised protection from brown outs for the budget
end APC UPS models such as the ES series.

I put the question to APC support on whether this is true.  Here
is the answer from APC Support:

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I understand your concern about the AVR features of a UPS. The advertising at
the retails store is not false. It's just that certain terms can be confusing.
I will explain it in detail here.

Actually, the Back-UPS ES is designed to provide protection against over as
well as under voltages, changes in the frequency, electrical disturbances and
noise in the line power. This protection comes into action when the UPS, upon
detecting a disturbance, goes to battery power so that a clean supply of 120 V
can be provided to the load connected. This is not the AVR feature because the
UPS does boost or trim the incoming voltage.

There are certain models like the RS models which offer AVR features. In such
cases, if the incoming voltage is lower than a certain limit, the UPS will
automatically boost the voltage to a normal acceptable range of 108-120 V
without going on battery power. The UPS has the capability to raise the
incoming voltage and pass on the raised voltage to the connected load. Note
here that the UPS does no go on battery and hence there is less drain on
battery. Similarly a trim operation is performed if the incoming voltage is
higher than a certain level. So in AVR UPSs, the range of normal operation
without going on battery is slightly greater than the other UPSs.

Back-UPS ES will provide protection against all types of power disturbances
including surges and brownouts.
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!DSPAM:41a7886718562903913949!




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