Network UPS

Installation

sudo apt update
sudo apt upgrade
sudo apt install nut

Configuration

• Checking connected APC via USB port: lsusb

Bus 001 Device 004: ID 051d:0002 American Power Conversion Uninterruptible Power Supply
In above screenshot, 051d is vendorID and 0002 is productID

• Add UPS to /etc/nut/ups.conf:

[ups]
driver = usbhid-ups
desc = "APC UPS"
port = auto
vendorid = 051d
productid = 0002 

• Change listening address in /etc/nut/upsd.conf: by default it listens on localhost only

LISTEN 0.0.0.0 3493

• Add UPS Users to /etc/nut/upsd.users

[upsmon]
  password = Password
  upsmon primary
# primary UPS is connected to this server directly
# Secondary if UPS connect to a remote NUT server

• Configure upsmon system:

MONITOR ups@localhost 1 $username $password primary

• Configure NUT Server /etc/nut/nut.conf

# Change from MODE=none to
MODE=netserver

• Restarting server after configuring

sudo systemctl restart nut-server
sudo systemctl restart nut-monitor

Testing

• upsc -l: list UPS

• upsc ups: check status of UPS ups

upsc ups 
Init SSL without certificate database
battery.charge: 100
battery.charge.low: 10
battery.mfr.date: 2001/01/01
battery.runtime: 3284
battery.runtime.low: 120
battery.type: PbAc
battery.voltage: 13.7
battery.voltage.nominal: 12.0
device.mfr: American Power Conversion
device.model: Back-UPS BX750MI 
device.serial: 9B2321A03421
device.type: ups
driver.debug: 0
driver.flag.allow_killpower: 0
driver.name: usbhid-ups
driver.parameter.pollfreq: 30
driver.parameter.pollinterval: 2
driver.parameter.port: auto
driver.parameter.productid: 0002
driver.parameter.synchronous: auto
driver.parameter.vendorid: 051d
driver.state: quiet
driver.version: 2.8.1
driver.version.data: APC HID 0.100
driver.version.internal: 0.52
driver.version.usb: libusb-1.0.27 (API: 0x1000109)
input.sensitivity: medium
input.transfer.high: 295
input.transfer.low: 145
input.transfer.reason: input voltage out of range
input.voltage: 234.0
input.voltage.nominal: 230
ups.beeper.status: disabled
ups.delay.shutdown: 20
ups.load: 10
ups.mfr: American Power Conversion
ups.mfr.date: 2023/05/26
ups.model: Back-UPS BX750MI 
ups.productid: 0002
ups.realpower.nominal: 410
ups.serial: 9B2321A03421
ups.status: OL
ups.test.result: Done and passed
ups.timer.reboot: 0
ups.timer.shutdown: -1
ups.vendorid: 051d

Installing and configuring NUT-GUI Server

• Installing: sudo apt install apache2 nut-cgi

• Configure /etc/nut/hosts.conf:

MONITOR ups@localhost "Local UPS"

• Enable CGI Apache module: sudo a2enmod cgi

• Restart Apache server: sudo systemctl restart apache2

• Accessing Nut's Web interface: http://$ipaddress/cgi-bin/nut/upsstats.cgi

Reference

• Monitoring a UPS with NUT on the Raspberry Pi

• How to Monitor UPS with Raspberry Pi

• NUT on Proxmox