search for: 13v

I have taken out the batteries and measured them with a multimeter. They put out 13V (they are rated 12V 9Ah). Putting them back again and disconnecting the UPS from the mains it is kept on, powering all the connected devices. The shutdowns only occur when the UPS is being monitored. Are you sure it's a battery problem? Do UPS perform further tests when they are being polled...

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

...ry, - 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 us...

On Dec 2, 2018, at 7:55 PM, raul <raulvior.bcn at gmail.com> wrote: > > I have taken out the batteries and measured them with a multimeter. They put out 13V (they are rated 12V 9Ah). What sort of load did you have in parallel with the multimeter? (This is why Wolfy mentioned the light bulb: if the battery has developed excessive internal resistance, it will show proper voltages when tested open-circuit, but will read lower with a load.) > Putting...

...odel is aov(Vol~apoe*hta*Age) where ope and hta are 2 levels factor, and Age is quantitativ data. We observed same results concerning : Residual interaction apoe:hta:Age and other outputs are different. Does anyone have an idea ? -- Delcroix Nicolas - GIN - CNRS UMR 6095 - CEA LRC 13V GIP CYCERON BP.5229 14074 CAEN Cedex tel: 02 31 47 02 79 fax: 02 31 47 02 22 Email: delcroix at cyceron.fr -------------- next part -------------- An HTML attachment was scrubbed... URL: https://stat.ethz.ch/pipermail/r-help/attachments/20010704/f90d325d/attachment.html

Hi Kris, On 09/21/2013 05:11 PM, Kris Jordan wrote: > John Morris wrote, On 9/21/2013 11:28 AM: >> The most distressing problem is the UPS stays OB after removing and >> reapplying utility power. When power is removed, the UPS goes OB and >> upsmon detects the power failure no problem, reporting >> 's0-ups0 at localhost is on battery'. But when power is

...the string voltage and not the single Cell voltage (Megatec 0.06). - About battery low and high guesstimation the formula uses these values: batt.volt.low = 104 * batt.volt.nom / 120 (for a 12V VRLA --> 10.4V batt.volt.low) batt.volt.high = 130 * batt.volt.nom / 120 (for a 12V VRLA --> 13V batt.volt.high). In my opinion these values are not correct (a 12V lead acid battery can be charged up to 13.8V while discharged to 9.6V) Instead I would suggest: batt.volt.low = 100 * batt.volt.nom / 120 (for a 12V VRLA --> 10V batt.volt.low) batt.volt.high = 135 * batt.volt.nom / 120 (for...

...on the list against it? > > > - About battery low and high guesstimation the formula uses these values: > > > > batt.volt.low = 104 * batt.volt.nom / 120 (for a 12V VRLA --> 10.4V batt.volt.low) > > batt.volt.high = 130 * batt.volt.nom / 120 (for a 12V VRLA --> 13V batt.volt.high). > > In my opinion these values are not correct (a 12V lead acid battery can be charged up to 13.8V while discharged to 9.6V) > > > > Instead I would suggest: > > batt.volt.low = 100 * batt.volt.nom / 120 (for a 12V VRLA --> 10V batt.volt.low) > >...

...uch 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 performanc...

Dear Daniele, nice to meet you, I'm a collegue of Gabriele. The problem with "blazer_usb" driver ("blazer_ser" works correctly) is related to the following commands: - "F" and "I": when the KRAULER subdriver check these UPS answers it uses wrong constants to check the lenght of the received packets, so these commands are considered as "not

> If there is no message to NUT, I would consider opening a trouble > ticket with Eaton. It is possible that there is a known issue and/or > a firmware upgrade. What kind of message to NUT? In the log (syslog) there is no other message registered. In nut.log only this appears: > Dec 1 08:10:54 openmediavault upsd[5284]: Data for UPS [ellipsemax] > is stale - check driver >