Network UPS Tools (NUT)

The Network UPS Tools (NUT) integration allows you to monitor and manage a UPS (battery backup) using a NUT server. It lets you view their status, receives notifications about important events, and execute commands as device actions.


To add the Network UPS Tools (NUT) integration to your Home Assistant instance, use this My button:

Network UPS Tools (NUT) can be auto-discovered by Home Assistant. If an instance was found, it will be shown as Discovered. You can then set it up right away.

Example Resources

Given the following example output from NUT (your variables may differ):

$ upsc [email protected]
ups.timer.reboot: 0
battery.voltage: 27.0
ups.firmware.aux: L3 -P
ups.mfr: American Power Conversion
battery.runtime.low: 120
ups.delay.shutdown: 20
ups.load: 19
ups.realpower.nominal: 600
battery.charge.warning: 50
battery.charge.low: 10
ups.vendorid: 051d
ups.timer.shutdown: -1
ups.test.result: No test initiated
ups.firmware: 868.L3 -P.D 3B1519X19994
ups.productid: 0002
battery.runtime: 2552
battery.voltage.nominal: 24.0
battery.type: PbAc OL
ups.model: Back-UPS RS1000G
ups.beeper.status: disabled
battery.charge: 100
input.sensitivity: medium
input.transfer.low: 88
input.transfer.high: 147
input.voltage: 121.0
input.voltage.nominal: 120
input.transfer.reason: input voltage out of range
output.current: 1.10
output.frequency: 60.20
output.voltage: 121.50
output.voltage.nominal: 120

Use the values from the left hand column. Support is included for most values with ups, battery, input and output prefixes.

UPS Status - human-readable version

An additional virtual sensor type ups.status.display is available translating the UPS status value retrieved from ups.status into a human-readable version.

Device Actions

A device action is available for each parameterless NUT command supported by the device. To find the list of supported commands for your specific UPS device, you can use the upscmd -l command followed by the UPS name:

$ upscmd -l my_ups
Instant commands supported on UPS [my_ups]:
beeper.disable - Disable the UPS beeper
beeper.enable - Enable the UPS beeper
test.battery.start.quick - Start a quick battery test
test.battery.stop - Stop the battery test

These commands will be available as device actions in Home Assistant, allowing you to interact with your UPS.

User Credentials and Permissions

To execute device actions through the NUT integration, you must specify user credentials in the configuration. These credentials are stored in the upsd.users file, part of the NUT server configuration. This file defines the usernames, passwords, and permissions for users accessing the UPS devices.

No actions will be available if no user credentials are specified for a given device.

Ensure the user you specify has the required permissions to execute the desired commands. Here’s an example of a user with command permissions in the upsd.users file:

    password = my_password
    actions = SET
    instcmds = ALL

In this example, the user my_user has permission to execute all commands (instcmds = ALL).

Please note that Home Assistant cannot determine whether a user can access a specific action without executing it. If you attempt to perform an action for which the user does not have permission, an exception will be thrown at runtime.