UPS & Power Management

A CyberPower CP1350EPFCLCD (1350VA/810W, AVR) protects all critical devices: router, switch, RPi, all 3 k8s nodes, and QNAP NAS.

The UPS is connected via USB to the RPi, which runs the NUT Server Home Assistant addon as the NUT master. The k8s nodes and QNAP act as NUT clients (slaves) and shut down gracefully on battery-low events.

Role	Device
NUT master (USB)	RPi — HAOS NUT Server addon
NUT slave	mc1, mc2, mc3 (k8s nodes)
NUT slave	QNAP TS-251D

flowchart TB
    UPS[CyberPower CP1350EPFCLCD\n1350VA/810W, AVR]

    subgraph powered[Protected devices]
        Router[ASUS RT-AX58U\n192.168.50.1]
        Switch[NETGEAR GS108GE]
        RPi[Raspberry Pi 4B\n192.168.50.9\nNUT master]
        QNAP[QNAP TS-251D\n192.168.50.8\nNUT slave]

        subgraph K8S[Home Cluster]
            mc1[mc1\nNUT slave]
            mc2[mc2\nNUT slave]
            mc3[mc3\nNUT slave]
        end
    end

    UPS -->|Schuko| Router
    UPS -->|Schuko| Switch
    UPS -->|Schuko| RPi
    UPS -->|Schuko| QNAP
    UPS -->|Schuko| mc1
    UPS -->|Schuko| mc2
    UPS -->|Schuko| mc3
    UPS -->|USB monitor| RPi

    RPi -->|NUT notify| QNAP
    RPi -->|NUT notify| mc1
    RPi -->|NUT notify| mc2
    RPi -->|NUT notify| mc3

[VIP]: Virtual IP (Used for high-availability controlplanes) [HA]: High Availability (often reduntant hardware/software) [PVC]: k8s resource - Persistent Volume Claim [PV]: k8s resource - Persistent Volume [CNI]: k8s networking - Container Network Interface [k8s]: Shortening of Kurbenetes [CRD]: Custom Resource Definitions [S3]: Simple Storage Service [NFS]: Network File System [DR]: Disaster Recovery