Shelly Plus PM Mini

Quick verdict

The Plus PM Mini does one thing well: it monitors power consumption on any circuit without switching it. Wire it inline, and it reports watts, voltage, and cumulative energy to Home Assistant over your local network. The Mini form factor is tiny enough to fit almost anywhere, and Shelly also sells a newer PM Mini Gen3 that does the same job with more memory. If you want visibility into what your hardwired appliances are consuming, this is the cheapest and smallest way to get it.

Standout: Pure power monitoring in a tiny inline package - tracks watts, voltage, and energy consumption without switching.

Notes last checked Mar 23, 2026.

Compatibility snapshot

Why it stands out

• monitors power consumption without switching - install it inline on any circuit you want to track
• extremely compact Mini form factor fits inside crowded junction boxes and breaker panels
• native Home Assistant integration with local API provides real-time energy data without cloud

Reasons to hesitate

• no relay - cannot switch the circuit on or off, only monitors it
• requires inline wiring installation - you need to be comfortable with mains electrical work
• Wi-Fi only, so each one adds to your wireless device count

Best for

• Home Assistant users who want per-circuit energy monitoring without adding switching capability
• tracking consumption of hardwired appliances like HVAC, water heaters, or EV chargers

Avoid if

• you want to both monitor and control the circuit - get a Plus 1PM or Plus 2PM instead
• you are not comfortable installing inline electrical devices

Privacy and local-control notes

Fully local via HTTP REST API or MQTT. Power consumption data stays on your network. No cloud account needed.

Home Assistant support: supported · integration path: native / local.

Buying reality check

Price notes: Very affordable for a dedicated power monitor. Cheaper than a smart plug and works on hardwired circuits that a plug cannot reach.

Compare side by side: see sensor comparisons →

Shelly vs Sonoff relays: which to put in the wall

For in-wall relays only: Shelly is local the moment you power it up and its PM models meter watts; Sonoff wins on Zigbee, no-neutral boxes and price.

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