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Configuring UPS Service

  2 minute read.

Last Modified 2022-08-05 11:39 EDT

TrueNAS uses NUT (Network UPS Tools) to provide UPS support. Connect the TrueNAS system to the UPS device. Configure the UPS service by going to Services, finding the UPS entry, and clicking edit edit icon.

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See UPS Screen for more information on UPS settings. Some UPS models can be unresponsive with the default polling frequency. This shows in TrueNAS logs as a recurring error like libusb_get_interrupt: Unknown error. The default polling frequency is two seconds. Decrease the polling frequency by adding an entry to Auxiliary Parameters (ups.conf): pollinterval = 10. This should resolve the error.

upsc(8) can get status variables like the current charge and input voltage from the UPS daemon. Run this command from the Shell using the syntax upsc ups@localhost. The upsc(8) manual page has other usage examples.

If the hardware supports sending the command, upscmd(8) can send commands directly to the UPS. Only users with administrative rights can administer these commands. Create these users in the Extra Users field.

Determine the correct device name for the UPS. Go to System > Advanced and select Show console messages. Plug in the USB device and look for a /dev/ugen or /dev/uhid device name in the console messages.
A UPS with adequate capacity can power multiple computers. Connect one computer to the UPS data port with a serial or USB cable. This primary system makes UPS status available on the network for other computers. The secondary computers receive UPS status data from the primary computer. The secondary computers receive power from the UPS. See the NUT User Manual and NUT User Manual Pages.

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