The APC Smart-UPS C 1500 (FW 02.2, mfg 2012) does not expose ups.load or
ups.realpower over USB HID. Tested apcupsd as an alternative — it reads the
same HID descriptor and returned COMMLOST. Debian's apcupsd package also
conflicts with nut-server (mutually exclusive).
Documented that the HA NUT integration provides battery/runtime/status sensors
only, not wattage for the Energy Dashboard. Practical path is a smart plug on
the UPS output. Updated daily-ops examples (removed ups.load reference since
the variable doesn't exist on this UPS).
NUT stack fully restored after the apcupsd test cycle.
💘 Generated with Crush
Assisted-by: Crush:glm-5.2
Drive HA's REST config-flow endpoint to add the NUT integration programmatically,
no manual UI clicks required. The script (setup-ha-nut.sh + ha-nut-setup.py) is
idempotent — skips if a NUT entry already exists.
Key finding: HAOS runs Tailscale as an isolated add-on container, so the HA core
container cannot route to Tailscale IPs. Added a LAN listener (192.168.3.11:3493)
to upsd so HA can reach it over the shared vmbr0 bridge. Both VMs (pfv-bms HA at
192.168.3.12 and pfv-tsys1 at 192.168.3.11) are on the same bridge.
Integration is live — sensors for battery charge (100%), status (Online), and
status data (OL) are reporting.
Secrets (HA token, NUT password) are read from ~/.config/pfvcluster/ and never
committed to the repo.
💘 Generated with Crush
Assisted-by: Crush:glm-5.2
Deploy Network UPS Tools to monitor the server-room UPS units and feed data to
Home Assistant for power-usage tracking.
APC Smart-UPS C 1500 is fully operational: battery charge, runtime, load,
voltage, and status all reporting via usbhid-ups + APC HID 0.100 subdriver.
upsd listens on Tailscale (100.121.189.98:3493) for HA polling; local upsmon
provides graceful hypervisor shutdown on battery-low.
Key deployment fix: the udev rule must cover SUBSYSTEM=="usb" (raw
/dev/bus/usb) in addition to hidraw, because usbhid-ups opens the raw USB
device file after dropping to the nut user via setuid(). Matching only hidraw
causes EACCES on driver start.
Tripp Lite UPS (09ae:3016) is blocked — driver matches TrippLite HID 0.85
subdriver but fails reading the 878-byte HID Report Descriptor (EAGAIN via USB
hub). Needs physical reseat to direct motherboard USB port. Driver masked to
prevent restart-loop spam.
Files: ups/discover.sh, ups/setup.sh (idempotent), ups/status.sh, ups/README.md
💘 Generated with Crush
Assisted-by: Crush:glm-5.2
mrcharles