[Nut-upsuser] APC SmartUPS 2200

[Sebastian Holzapfel]

Unfortunately, that's a well known and documented behavior of APC UPS's.
The information that is delivered from these devices through standar USB
communication is slow and sometimes it doesn't refreshes the states since
APC does not follow USB-HID standard protocol, instead they use their own
modified version one. For example, mine is stuck on OB, this means that it
was always reporting to be on battery.
What I did to resolve this was to unfortunately use APC oficial software, I
used PowerChute Serial Shutdown which can read the real states of the UPS
and which this software is able to act as an SNMP server too, but again,
with its own proprietary MIB. Then, use the GitHub repository of NUT so you
can clone the actual source code of the project, in it, there is a script
on the SNMP sub-driver folder that you can use to make NUT be able to learn
the SNMP strings from APC software. Once it's done, re-compile NUT with
this new SNMP sub-driver, then configure NUT to use SNMP and use that
created MIB.
By the way, it sounds complicated, but everything is well documented and
the script is a tremendous help. For sure, some skills will be required but
nothing to savy, if you are already using NUT on linux, then, trust me you
have the enough skills.


El mié, 18 feb 2026 a la(s) 10:15 a.m., Greg Troxel via Nut-upsuser (
nut-upsuser at alioth-lists.debian.net) escribió:

> Andrea Venturoli via Nut-upsuser <nut-upsuser at alioth-lists.debian.net>
> writes:
>
> > On 1/22/26 14:00, Andrea Venturoli wrote:
> >
> >> This is more or less able to comunicate but:
> >> _ no matter what, the battery charge is alway 100% (even when
> >> obviously this can't be and the front panel shows otherwise);
> >> _ input voltage works seems to be the only parameter that changes;
> >> _ still the UPS status is always "OL" and NUT won't log anything if
> >> I disconnect the power cable (so I guess it won't turn off the
> >> machine when needed).
> >> Is there anything I can do?
> >
> > No hint?
>
> Probably no response because your question lacked a lot of details about
> what you've tried (like exactly which driver, and what happened when you
> tried all the others that might sort of work) and it doesn't seem like
> you have turned on debugging nd read the debug output.
>
> A very quick search turned up
>
> https://networkupstools.org/ddl/APC/Smart-UPS_2200.html
>
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