BESTUPS(8) Network UPS Tools (NUT) BESTUPS(8)
bestups - Driver for Best Power / SOLA (Phoenixtec protocol) UPS equip-
This man page only documents the hardware-specific features of the
bestups driver. For information about the core driver, see nutups-
bestups was designed to monitor Best Power UPS hardware like the
Fortress, Fortress Telecom, Axxium Rackmount and Patriot Pro. It also
recognizes and supports SOLA units such as the 325, 520 and 620. In
addition, the Best 610 is supported using the ‘ID’ option.
Other UPS hardware using the Phoenixtec protocol should also work, but
they will generate a warning since their battery information is not
This driver does not support some older Best/SOLA units.
This driver supports the following optional settings in the
Override the nominal battery voltage which is normally deter-
mined by asking the hardware. This is useful if your UPS con-
stantly reports battery.charge values just below 100% even when
it’s completely charged.
If you have this problem, set this to whatever battery.voltage
reports when the UPS is known to be completely charged with a
The author’s Best Fortress 750 uses nombattvolt=27.4.
Set the Identification response string. This should only be
used with hardware that supports the Phoenixtec protocol status
inquiry commands, but not the "ID" command, such as the
Best/SOLA 610. Format of the ID string is:
AAA is the three-character identification for the UPS model.
BBBB is the output power in VA (volt amperes). B is an integer
number ranging from 0 to 9.
CCC is the Nominal Input Voltage. C is an integer number ranging
from 0 to 9. The unit is Volts AC.
DDD is the Nominal Output Voltage. D is an integer number rang-
ing from 0 to 9. The unit is Volts AC.
EE.E is the Battery Voltage that will cause the UPS to shut
itself off. E is an integer number ranging from 0 to 9. Then
unit is Volts DC and a decimal point is present.
FF.F or FFF.F is the Battery Voltage at full charge. F is an
integer number ranging from 0 to 9. Then unit is Volts DC. Typi-
cally, for 700VA, 1KVA and 1.5KVA units, the format is FF.F. For
2KVA and 3KVA units, the format is FFF.F.
Example: a Best 610 1.5KVA unit would use the string
The battery charge percentage value (in battery.charge) 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 battery.voltage 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. You can use nom-
battvolt= in ups.conf(8) to fix this.
Russell Kroll, Jason White
The core driver:
The NUT (Network UPS Tools) home page: http://www.networkupstools.org/
Wed Jul 28 2004 BESTUPS(8)
Man(1) output converted with