Other UPS hardware using the Phoenixtec protocol should also work, but they will generate a warning since their battery information is not known.
This driver does not support some older Best/SOLA units. Try the bestfort driver if this one does not detect your UPS.
This driver does not support any extra values for -x or in the ups.conf(5).
The battery percentage is derived from the voltage data that the UPS returns, since the UPS doesn't return that value directly. On some hardware, the charge will remain at 100% for a long time and then drops quickly shortly before the battery runs out. You can confirm from the BATTVOLT readings that this is a problem with the UPS and not this driver.
Similarly, the float from the charger in some models forces the battery charge percentage back up to 100% immedately after the UPS goes back on-line, so you can't tell when it is really recharged.
Finally, some models give one value for the battery's nominal voltage and yet actually have a nominal voltage slightly below that. This leads to things such as the perpetual 98.7% charge on the author's Fortress 750, even when it's been charging for weeks.
NUT mailing list archives and information: http://lists.exploits.org/
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