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Install the required packages:

apt install apcupsd apcupsd-cgi

Edit the conf file

nano /etc/apcupsd/apcupsd.conf:

UPSCABLE usb
UPSTYPE usb
#DEVICE /dev/ttyS0
POLLTIME 60
BATTERYLEVEL 10
MINUTES 3

Restart the UPS monitoring service:

systemctl restart apcupsd.service

Check /var/log/syslog for errors and check communication with:

apcaccess

NOTE: Currently this package is old and produces constant errors in the events log. - it may be better to use NUT

Install the required packages:

apt install nut

Edit the ups.conf file.

nano /etc/nut/ups.conf

Add the following at the bottom of the file.

[apc]
driver = usbhid-ups
port = auto
desc = "Back-UPS BX750MI"
override.battery.charge.low = 50

Edit /etc/nut/upsd.conf

nano /etc/nut/upsd.conf

Uncomment and modify the following lines.

MAXAGE 30
LISTEN 127.0.0.1 3493
MAXCONN 10

Edit the file /etc/nut/upsd.users

nano /etc/nut/upsd.users

Add the following to the end of the file.

[upsuser]
password=<secret>  <-- This can be anything (make up some secret)
upsmon master