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gferg 2007-05-23 13:01:59 +00:00
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LDP/howto/docbook/UPS-HOWTO.xml
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@ -26,6 +26,14 @@
</authorgroup> </authorgroup>
<revhistory> <revhistory>
<revision>
<revnumber>2.2</revnumber>
<date>2007-05-22</date>
<authorinitials>esr</authorinitials>
<revremark>
Minor update with more info about battery types.
</revremark>
</revision>
<revision> <revision>
<revnumber>2.1</revnumber> <revnumber>2.1</revnumber>
<date>2005-09-28</date> <date>2005-09-28</date>
@ -101,7 +109,7 @@ yourself.</para>
<para>The advice in this document is aimed primarily at small <para>The advice in this document is aimed primarily at small
installations &mdash; one computer and one UPS. Thus we'll focus on installations &mdash; one computer and one UPS. Thus we'll focus on
consumer-grade UPes, especially those designed for home and consumer-grade UPSes, especially those designed for home and
small-business use. If you are a data center administrator running a small-business use. If you are a data center administrator running a
big server farm, there is a whole different (and much more expensive) big server farm, there is a whole different (and much more expensive)
range of technologies we'll do no more than hint at here.</para> range of technologies we'll do no more than hint at here.</para>
@ -164,7 +172,7 @@ fractions of a second to hours. This can be caused by heavy equipment coming on
line such as shop tools, elevators, compressors etc. Also occurs when line such as shop tools, elevators, compressors etc. Also occurs when
utility companies deliberately do this to cope with peak load times.</para> utility companies deliberately do this to cope with peak load times.</para>
<para>A <emphasis>spike</emphasis> is a remendous increase in voltage over <para>A <emphasis>spike</emphasis> is a tremendous increase in voltage over
a very short period of time often caused by a direct lightning strike on a a very short period of time often caused by a direct lightning strike on a
power line or when power returns after a blackout.</para> power line or when power returns after a blackout.</para>
@ -470,13 +478,12 @@ that. Running unprotected is false economy, because you
and, Murphy's Law being what it is, you will always get hit at the and, Murphy's Law being what it is, you will always get hit at the
worst possible time.</para> worst possible time.</para>
<para>One thing to note is that you typically shouldn't put a <para>One thing to note is that you typically shouldn't put a laser printer
laser printer on a UPS &mdash; toner heaters draw enough current to on the brownout-protected sockets in a UPS &mdash; toner heaters draw
overload a UPS and cause a shutdown within seconds. The other thing enough current to overload a UPS and cause a shutdown within
is that you can't even put the laser printer on the same circuit with seconds. Modern UPSes generally have some plugs that are marked
a UPS &mdash; the heater kicks on every 20-30 seconds, and most UPSs surge-suppressed but not filtered through the battery; plug your
will see the current draw as a brownout. So buy a separate line printer into one of those.</para>
conditioner for the laser printer.</para>
<para>A UPS should be wired directly to (or plugged directly into) the <para>A UPS should be wired directly to (or plugged directly into) the
AC supply (i.e. a surge suppressor is neither required nor suggested AC supply (i.e. a surge suppressor is neither required nor suggested
@ -523,11 +530,11 @@ American Power Corporation.</para>
<para>Both are solid, well-run projects. Their development groups are <para>Both are solid, well-run projects. Their development groups are
mutually friendly, and there has been occasional talk of a merger. mutually friendly, and there has been occasional talk of a merger.
Awkwardly, as of October 2003 the <application>apcupsd</application> Awkwardly, the <application>apcupsd</application> project is in many ways
project is the more featureful of the two, with, among other things, the more featureful of the two, with, among other things, better USB
better USB support and better documentation &mdash; but the NUT tools support and better documentation &mdash; but the NUT tools have a cleaner
have a cleaner architecture, more developers, and acceptance in Red Hat architecture, more developers, and acceptance in Red Hat and other major
and other major distributions.</para> distributions.</para>
<para>My advice is simple; run <application>apcupsd</application> if <para>My advice is simple; run <application>apcupsd</application> if
you buy an APC UPS, and the NUT tools if you buy anything else. RPMs you buy an APC UPS, and the NUT tools if you buy anything else. RPMs
@ -688,6 +695,18 @@ do this for you. If not, your local garbage company or waste-disposal
authority can explain to you how and where to turn them in authority can explain to you how and where to turn them in
safely.</para> safely.</para>
<para>Many UPS models use gel-cel batteries in standard formats like 12.0
V, 7.2Ah (151x64x94 mm). Warning: Many manufactors sell two or three
different types: standard use, cyclic use and high-current use. UPSes
require high-current and some UPS don't work well with batteries for
standard use, because the voltage goes low too early under high load (the
UPS turns off too fast or the output voltage drops so that the computer
turns off). Standard batteries are for alarm devices, emergency lights or
things like that. For instance Panasonic sells the "LCR127R2PG1"
(standard), and "UPRW1245P1" (high current), Fiamm the "FG20271" (standard)
and "FGH20902" (high current), CSB the "GP1272" (standard) and "HR 1234W"
(high current).</para>
<para>Below, you will find some suggestions for buying replacement <para>Below, you will find some suggestions for buying replacement
batteries. One <emphasis>important</emphasis> note of caution: at batteries. One <emphasis>important</emphasis> note of caution: at
least one user purchased one of the aftermarket batteries noted below least one user purchased one of the aftermarket batteries noted below