On 10/30/2016 12:47 AM, Ned Slider wrote:
On 30/10/16 07:11, Hadi Motamedi wrote:
But the site is far remote and having alert on battery exhaustion can no
longer help . As I said before , I am suspicious if it comes from
frequent
power cuts so seeking some means to distinguish it among the system
logs.
Your UPS should be capable of logging to /var/log/messages and should
also be capable of powering down the system cleanly when the battery
reaches a predetermined critical level (either run time remaining or
percentage charge), so there shouldn't be any uninitiated shutdowns.
The UPS logs should tell you exactly how many power outages you are
getting together with how long each one lasts. It sounds like you
haven't configured your UPS.
if its a proper enterprise/server grade commercial UPS, you should be
able to monitor the charge state of the battery via the USB network
interface... I don't know what sort of UPS this is, and I've seen some
pictures of some awful things in the third world that use a charger
module, and a bunch of old car batteries on the floor, and an inverter,
running whole households during the regular afternoon brownouts. I
don't think those sorts of things *have* network monitoring, but
enterprise grade UPS's like newer SmartUPS, Eaton PowerWare, etc DO have
this ability. APC tend to be worse at this than most of the better
alternatives like Eaton.
if this UPS *does* have any sort of thing that will give you battery
state information, use NUT, the Network UPS Tool, on linux, and if
you're dealing with a homebrew UPS, build your own module that can
monitor that voltage. I would use NUT initiate an OS shutdown when you
get to 20% battery charge state, which is around 12.0VDC (fully charged
12V lead acid battery is 12.6VDC, on the AC powered charger, its more
like 13.8-14.1V). NUT is quite powerful, and very flexible. one
server could monitor the UPS (maybe even via using a USB digital volt
meter module connected directly to the batteries), and that master NUT
node could tell all the other nodes/systems to shutdown, too.
Letting this sort of homebrew UPS fully run down the batteries to
totally dead shortens the batteries life. if you could shut the
systems AND the UPS off at before the batteries are totally run down,
they'll last a lot longer.
if this UPS is the homebrew third world bodge I described, you could
pretty easily build a NUT master w/ a raspberry pi and a ADC 'hat'
--
john r pierce, recycling bits in santa cruz
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