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:
20200124 201318 32 0.0 12 [OB] NA 0.0
20200124 201323 30 0.0 13 [ALARM OB LB] NA 0.0
20200124 201328 30 0.0 13 [FSD ALARM OB LB] NA 0.0
20200124 201333 30 0.0 13 [FSD ALARM OB LB] NA 0.0
20200124 201338 30 0.0 13 [FSD ALARM OB LB] NA 0.0
20200124 201340 30 0.0 13 [FSD ALARM OB LB] NA 0.0
The server was shutdown properly, but for some reason it did not power
off. I saw an error from umount about busy file system, but I'm sure
this doesn't always happen.
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).
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...
20200125 021123 70 0.0 16 [OB] NA 0.0
20200125 021128 69 0.0 16 [FSD ALARM OB LB] NA 0.0
20200125 021133 69 0.0 16 [FSD ALARM OB LB] NA 0.0
20200125 021138 69 0.0 16 [FSD ALARM OB LB] NA 0.0
20200125 021143 69 0.0 16 [FSD ALARM OB LB] NA 0.0
20200125 021148 69 0.0 16 [FSD ALARM OB LB] NA 0.0
20200125 021150 69 0.0 16 [FSD ALARM OB LB] NA 0.0
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?
Regards,
--
Georgi
On 24.1.2020 at 18:28, Manuel Wolfshant wrote:
On January 24, 2020 6:13:31 PM GMT+02:00, "Georgi D. Sotirov"
<gdsoti...@gmail.com> wrote:
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,
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.
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.
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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