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<div align="justify">OK, so yesterday evening I done a real test
cutting of the power to the UPS. And it went good... the UPS
supported my server for 28:50 minutes (i.e. the expected runtime
with this load), before forcing shutdown. The batteries could
still hold as charge was 30 % with about 15 minutes run time. And
the UPS did hold for another full 10 minutes before powering off.
These are the relevant lines from /var/log/ups:<br>
<br>
<font face="Courier New, Courier, monospace">20200124 201318 32
0.0 12 [OB] NA 0.0<br>
<font color="#ff0000">20200124 201323 30 0.0 13 [ALARM OB LB] NA
0.0</font><br>
20200124 201328 30 0.0 13 [FSD ALARM OB LB] NA 0.0<br>
20200124 201333 30 0.0 13 [FSD ALARM OB LB] NA 0.0<br>
20200124 201338 30 0.0 13 [FSD ALARM OB LB] NA 0.0<br>
20200124 201340 30 0.0 13 [FSD ALARM OB LB] NA 0.0</font><br>
<br>
The server was shutdown properly, but for some reason it did not
power off. I saw an error from <font face="Courier New, Courier,
monospace">umount</font> about busy file system, but I'm sure
this doesn't always happen.<br>
<br>
With everything powered off, I extracted the original batteries to
check them and measure the voltage. The batteries are Leoch
DJW12-9.0 with one of them at 12.57 V and the other at 12.64 V
(measured without load after the discharge).<br>
<br>
And this morning there was again a short power failure (not more
than 30 minutes, because the router connected to the battery power
from the UPS did hold up). With batteries charged up to 91% the
UPS supported the server for just 07:10 minutes and forced
shutdown with 69% battery charge and over 20 minutes of run
time...<br>
<br>
<font face="Courier New, Courier, monospace">20200125 021123 70
0.0 16 [OB] NA 0.0<br>
<font color="#ff0000">20200125 021128 69 0.0 16 [FSD ALARM OB
LB] NA 0.0</font><br>
20200125 021133 69 0.0 16 [FSD ALARM OB LB] NA 0.0<br>
20200125 021138 69 0.0 16 [FSD ALARM OB LB] NA 0.0<br>
20200125 021143 69 0.0 16 [FSD ALARM OB LB] NA 0.0<br>
20200125 021148 69 0.0 16 [FSD ALARM OB LB] NA 0.0<br>
20200125 021150 69 0.0 16 [FSD ALARM OB LB] NA 0.0</font><br>
<br>
So, it seems to me that my UPS forces shutdown pretty randomly.
Why the UPS is not waiting for the preset low battery charge value
of 15%? What is actually driving this FSD ALARM and LB signal when
batteries for sure could hold up more?<br>
</div>
<br>
<br>
Regards,<br>
--<br>
Georgi<br>
<br>
<div class="moz-cite-prefix">On 24.1.2020 at 18:28, Manuel Wolfshant
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:05C56614-98E8-4AAD-B6DD-E1D303964190@nobugconsulting.ro">
<pre class="moz-quote-pre" wrap="">On January 24, 2020 6:13:31 PM GMT+02:00, "Georgi D. Sotirov" <a class="moz-txt-link-rfc2396E" href="mailto:gdsotirov@gmail.com"><gdsotirov@gmail.com></a> wrote:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">OK, my UPS turned out to be older that I thought. I apparently bought
and installed it in September 2016 (not 2017 as I initially wrote).
That
makes for over 3 years of work, which is over the life expectancy of
the
batteries,
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">Good batteries can last 4-5 years. The chinese ones available in most shops last cca 2 years.
I use Panasonic (ordered from SOS Electronic) and they last 3-4 years. Even more.
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">so I ordered new battery pack.
However, how could I make a full charge/discharge test? Should I
disable
SHUTDOWNCMD in upsmon.conf? Or is there any other way to ignore forced
shutdown? I'd like to see how long it would go until the batteries
actually drain.
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">Disconnect the computer from the UPS, connect a dummy load (like 2-3 * 100W tungsten light bulbs) , turn off the nut client on the computer. Start a stopwatch. Unplug the UPS from mains and wait for it to die. Read the value on the stopwatch.
wolfy
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</blockquote>
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