SONOFF MINI PM
SONOFF MINI PM Zigbee power meter (MINI-ZB1GP) is a highly specialized, extremely compact Zigbee 3.0 device designed to solve a specific smart home problem: how to monitor the energy consumption of critical appliances without the risk of accidentally turning them off?
Unlike standard smart relays, the MINI PM does not contain a switching mechanism. It is a pure, always-on energy meter. This makes it the perfect and safe solution for monitoring refrigerators, freezers, NAS servers, and medical equipment, where an accidental touch in an app could cause a disaster.
Key features
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Always-on pass-through design: Since it physically lacks a relay, it is impossible to accidentally cut power to the connected appliance due to an automation error or a mistaken click in the app. It is simply installed in-line and passively monitors the electricity flowing through it.
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Bi-directional energy metering: It does not only measure energy consumed from the grid; it also measures energy fed back into the grid. This makes it an incredibly affordable and accurate way to monitor energy production from plug-in balcony solar panels or smaller photovoltaic systems.
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Appliance state detection: Since you know the load will not be turned off, you can use power readings to create highly reliable automations. For example, you can trigger a notification when your washing machine's power consumption drops below 5 W, informing you that the cycle is complete.
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High 16 A capacity: Despite its small size, it can safely handle continuous loads of up to 16 amperes (approx. 3840 W), making it perfectly suitable for high-load appliances such as water heaters and washing machines.
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Zigbee router with Turbo mode: Since it is permanently connected to mains power, it acts as a highly reliable Zigbee router. It actively repeats the signal of other Zigbee sensors and features a "Turbo mode" that pushes the signal through thick walls and extends the range of your mesh network.
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Extremely compact design: Measuring only 32 × 29 × 15.9 mm, it easily hides behind standard wall sockets or in cramped electrical junction boxes without requiring major wiring modifications.
Technical specifications
| Feature | Specification |
| Model | MINI-ZB1GP (MINI PM) |
| Device type | Non-switching bi-directional power meter |
| Microcontroller (MCU) | EFR32MG21 |
| Wireless protocol | Zigbee 3.0 (IEEE 802.15.4) |
| Power input | AC 100–240V ~ 50/60 Hz |
| Max load | 16 A / 3840 W |
| Relay / Switching | None (pass-through only) |
| Energy metering | Voltage, current, active power, bi-directional energy |
| Switch input terminals | None |
| Platform compatibility | eWeLink, Home Assistant (ZHA / Zigbee2MQTT), SmartThings |
| Operating temperature | -10 °C to +40 °C |
| Supported wire gauge | 0.75–2.5 mm² (18–14 AWG) solid or stranded copper wire |
| Casing material | Flame-retardant polycarbonate (PC) |
| Dimensions | 32 mm × 29 mm × 15.9 mm |
Package contents
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SONOFF MINI PM Zigbee Power Meter
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Quick start guide and wiring diagram