On 1/25/20 10:53 AM, Georgi D. Sotirov wrote:
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
that looks perfectly fine
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.
the error is related to your linux system, not to nut
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).
That's... surprisingly well, assuming your multimeter indicates correct
values. I would have expected values well below 12V
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?
Can you please show us all the configuration files ? I can only suspect
that there is something wrong there because (from a hardware point of
view) the UPS behaves very very well, according to your tests and logs.
_______________________________________________
Nut-upsuser mailing list
Nut-upsuser@alioth-lists.debian.net
https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/nut-upsuser
