Shelly Plus 2PM Gen4 for Smart Home Energy Monitoring

Two independent channels on one tiny board is the pitch here. The Shelly Plus 2PM Gen4 measures 37 x 42 x 16 mm, yet it switches and separately meters two circuits, each rated to 10A (16A total). That's what makes it more than a switch: it's energy monitoring per channel, so you can see exactly what each load pulls. Tuck it behind a wall plate and control blinds, a pair of light circuits, or a fan and a pump, all while it reports voltage, current, and usage back over Wi-Fi, Bluetooth, Zigbee, or Matter.

What It Is

Right from the start, this device is notable for its small size and big capabilities. Measuring just 37 x 42 x 16 mm and weighing 30 g, it slips into standard wall boxes without hassle. It handles two independent channels on the same phase, each with up to 10 A AC switching (16 A total, 18 A peak). This makes it ideal for lights, fans, or even blinds with precise slat control.

What sets this device apart is built-in power metering per channel. You get voltage, current, and energy readings, plus an internal temperature sensor. Power it with 110-240 V AC or 24 V DC, and it consumes less than 1.4 W itself. The Gen4 upgrade brings a faster chipset, more RAM, and native Matter compatibility for future-proofing your installation.

Specs and Numbers

This device packs solid hardware into a tiny package. Its ESP-Shelly-C68F processor with 8 MB flash handles complex tasks smoothly. Electrical specs include max 240 V AC / 30 V DC switching, with ammeter and voltmeter for accurate AC measurements.

Wireless options shine: Wi-Fi (802.11 b/g/n/ax) reaches 30 m indoors/50 m outdoors; Bluetooth 5.0 up to 10 m indoors; Zigbee (802.15.4) extends to 100 m indoors/300 m outdoors. All at under 20 dBm RF power for safe operation.

Firmware features include 20 schedules, 20 webhooks (5 URLs each), full scripting, and MQTT support. Screw terminals take 0.4 Nm torque, and it needs external B/C circuit breakers (16 A max, 6 kA breaking).

Here are the key specs in a simple list:

Key Points

• Dimensions: 37 x 42 x 16 mm (1.46 x 1.65 x 0.63 in)
• Weight: 30 g (1.06 oz)
• Power Supply: 110-240 V~ / 24 VDC ±10%
• Switching: 10 A/channel AC, 10 A DC
• Sensors: AC voltmeter, ammeter, temperature
• Connectivity: Wi-Fi, Bluetooth, Zigbee, Matter
• Protections: Energy limiting class 3

Fitting It Into Your Setup

Integration is where it excels in home automation. Choose Wi-Fi for direct app control via the Shelly Cloud, or Zigbee for mesh networks without a hub. Matter support means it works with Apple HomeKit, Google Home, Alexa, and more out of the box.

Bluetooth simplifies local setup and pairing. Advanced users love MQTT, WebSocket, REST API, and scripting for custom logic. No CoAP, but HTTP actions and schedules cover most needs. Pair it with voice assistants for hands-free control: "Alexa, close the blinds" using its cover mode.

In any smart home, link it to sensors for automation. For example, trigger based on motion or temperature from other Shelly devices. It's perfect for SmartThings or Home Assistant via Zigbee or MQTT.

Where It Shines

This device fits many smart home scenarios, thanks to dual channels and metering.

• Blinds and Shutters: Control position and slat angle for one motor. Automate sunrise/sunset schedules to save energy and boost privacy.
• Appliance Monitoring: Track power on fans, pumps, or heaters per channel. Spot inefficient devices and cut bills with energy savings.
• Lighting Control: Switch two light circuits independently. Integrate with smart lighting for scenes via app or voice control.
• Industrial Light: Monitor split loads like routers or valves. Use scripting for alerts on high usage.
• HVAC Fans: Automate based on internal temp sensor for energy efficiency.

These uses highlight its versatility for homes or facilities.

Installation and First Setup

Getting it running is straightforward for DIY fans. First, power off the circuit. Mount in a wall box using the console. Wire channels to loads (same phase), neutral, and live. Torque screws to 0.4 Nm.

Download the Shelly Smart Control app (iOS/Android). Connect via Bluetooth for initial Wi-Fi setup. Scan QR code for Matter pairing if needed. The built-in web interface lets you configure modes: switch, cover, or metering. Test channels and calibrate for shutters.

Firmware updates happen over-the-air. For Zigbee, join a coordinator network. Scripting? Access via web for custom JS. Full guides in the app or knowledge base ensure quick troubleshooting.

Safety note: Use qualified electricians for installs. External breakers required.

Is the Shelly 2PM Gen4 Right for You?

Buy this if you need two things controlled and metered from one spot behind the wall: a pair of light circuits, a blind motor with slat control, or a fan paired with a pump. The dual channels and per-channel metering are the real draw, and at 4.7 stars from 1200-plus reviews, most buyers seem to agree. Zigbee and Matter both work without a separate hub, which is genuinely handy for a retrofit.

Where's the limit? Each channel tops out at 10A, and 16A total, so don't split a big shared load expecting full current on both at once. It also lives inside a live wall box, so unless you're confident with mains wiring, get an electrician. Privacy-minded users will appreciate that the metering and dual-channel automations can run locally, no cloud required, feeding a smart home ecosystem you actually control. For anyone weighing a single-channel relay against this, that second metered channel is usually worth the small step up.