> Hi I hope someone can please help. > > I have an Ubuntu Server running 14.04.3 LTS and using an APC ES550 UPS > connected via USB. > > I've installed Nut and can see it does monitor the UPS correctly and give > the correct stats with battery percentage etc. > > But on doing a "real" test and unplugging the UPS from the power supply, > after watching the battery drop slowly suddenly the server just lost power > along with the UPS and monitor. No graceful shutdown and I didn't see any > attempt at a warning or shutdown in any way. > > Now I realise my UPS is no use at all if my system doesn't shutdown. > > Can anyone please help me get this to work as I'm vulnerable at present.
Chuckle. I remember a previous New Year I said "Watch This" pulled the plug, & what visitors expected & I did Not ... Happened ... All disc spun down. Demo effect ! I hadnt checked batteries for a while. As ever, as I & others have commented over years in archives, first disconnect batteries & check voltage of each battery, - dead easy, Then much more important: calculate internal resistance of each battery. Batteries go bad after some years, even on trickle charge. Measure voltage drop when driving a load such as 1 or a few car headlamp bulbs in parallel. Then its simply Ohms law V=IR, If voltage drops from say 13V to 11V & if you use 1 headlamp that uses maybe 4 amps, then 13-11 / 4 = 2/4 = 0.5 which is on high side, you dont want higher, better 0.3 or less. Your UPS for PC's will prob. want a lot more than 4 amps, so low internal resistance is critical to good UPS performance. If you decide to use computer as your measurement load instead or a car headlamp bulb, remember the static inverter is still On, generating 110 or 240 Volts, dont kill yourself or blow stuff up while measuring :-) > Nut Version: 2.7.1-1ubuntu1 > Nut installation method was just through apt from standard Ubuntu repos. > > Thanks very much indeed. > Cheers, Julian -- Julian Stacey, BSD Linux Unix Sys. Eng. Consultant Munich http://berklix.com Reply After previous text to preserve context, as in a play script. Indent previous text with > Insert new lines before 80 chars. Use plain text, Not quoted-printable, Not HTML, Not base64, Not MS.doc. _______________________________________________ Nut-upsuser mailing list Nut-upsuser@lists.alioth.debian.org http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/nut-upsuser
