I honestly don't know much about the nut ups service. I use APC or Tripp Lite units with my OMVs and never had an issue. They do have a compatibility list and your unit is not on it. But your error seems odd. Maybe Volker will shed some light on this. I do not know if the driver for nut needs to contain information for the unit in question or not.
@votdev, is there something you can do to get this ups working or must it be added by the nut developers?
I think this is a driver problem and must be solved by the NUT tools.
Absolutely no support through PM!
I must not fear.
Fear is the mind-killer.
Fear is the little-death that brings total obliteration.
I will face my fear.
I will permit it to pass over me and through me.
And when it has gone past I will turn the inner eye to see its path.
Where the fear has gone there will be nothing.
Only I will remain.