I would recommend a category in the ups.ini
call it
[VoltFreq]
240/50 Europe/ME/Asia - common
120/60 North American/Japan common
100/50
100/60 east/west Japan freq differences.
127/60
127/50 odd value Volts, indonesia/aruba.
240/50
230/50
220/50 varying volts, freq stays the same.
220/50
220/60 varying freq, volts stays the same.
An odd suggestion; but this...
2007-04-25 19:27:46 UTC in Windows NUT client