[Nut-upsuser] false low battery alarm

Manuel Wolfshant wolfy at nobugconsulting.ro
Thu Feb 28 18:31:34 UTC 2013

On 02/28/2013 07:55 PM, Kris Jordan wrote:
> Vieri wrote, On 2/28/2013 9:41 AM:
>> --- On Thu, 2/28/13, Manuel Wolfshant <wolfy at nobugconsulting.ro> wrote:
>>> Good batteries ( for instance Yaesu, as seen in APC UPSes )
>>> last 4
>>> years. Normal ( usual ) ones last 2. Do the math yourself
>> Thanks for that information.
>> Just a side question:
>> Will the ups.mfr.date value be updated automatically by the APC ups 
>> firmware when I change the battery or will I need to set it manually? 
>> I'm asking because I'm not sure if the current battery was really 
>> installed at the time indicated by this field.
> Where APC has provided a value for battery mfg date, it has always 
> been the same as the UPS mfg date. The value isn't automatically 
> updated and NUT doesn't (from what I've seen) provide a way to update 
> it manually.
I had to use apctest from the apcupsd suite to do that

> Before getting new batteries, you might want to check the float 
> voltage with a good multimeter. 55.65 is rather high (~2.32/cell), but 
> I wouldn't trust what the UPS says. Smart-UPS's can be bad about 
> overcharging their batteries. It can be adjusted by software in some 
> cases.
>> I also have another (maybe related) problem. I have another 2 APC 
>> devices I'd like to monitor (apparently same model and serial 
>> numbers). However, whenever I connect a serial cable to the port on 
>> the UPS, the whole device shuts down immediately. This happens only 
>> if I connect the other end of the serial cable to either a ttyS0 port 
>> on a running motherboard or a port on a rs232-to-usb adapter (even if 
>> the usb end ISN'T connected to a NUT monitoring server). 
my APC SmartUPS 1000 -/SU1000I/ shuts down the very instant I connect it 
to my workstation using a serial cable that I had handy ( received 
together with a switch ). I guess that the incorrect wiring makes the 
UPS go nuts.

>> What could be happening here?
>> This is obviously slightly off-topic because it doesn't seem to be 
>> related to the nut ups drivers.
>> I'm just wondering what could be happening and if old batteries on 
>> relatively high load (approx. 75%) could be a reason the UPS shuts 
>> down abruptly on connecting a serial cable on both ends. IT sounds 
>> really strange though.
>> Also, the UPS won't switch on while the serial cable is connected 
>> even if I press the UPS power-on button several times.
>> I have to disconnect it (or at least the far end of it) in order to 
>> "boot" the ups.
> Are you using APC's supplied serial cable? They have special wiring 
> and it varies depending on UPS model.

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