Seeed Studio’s XIAO 2-channel Wi-Fi AC Energy Meter is an ESP32-C6 (XIAO ESP32-C6) powered power meter with two independent CT clamp (Current Transformer clamp) connectors to safely measure power consumption when placed around one of the wires from an AC cable.
We reviewed the SONOFF POW Ring single-channel WiFi CT clamp power meter with eWelink and Home Assistant last year, and before that, we also covered models supporting multiple CT clamps, up to 16 clamps with the Emporia Vue Gen 2 energy monitor. The XIAO 2-channel Wi-Fi AC Energy Meter offers a middle ground with support for two CT clamps measuring up to 35A each.
XIAO 2-channel Wi-Fi AC Energy Meter specifications:
- Wireless module – XIAO ESP32C6 board
- Wireless MCU – Espressif Systems ESP32-C6
- CPU
- Single-core 32-bit RISC-V clocked up to 160 MHz
- Low-power RISC-V core @ up to 20 MHz
- Memory – 512KB SRAM, 16KB low-power SRAM
- Storage – 320KB ROM, and 4MB flash
- Wireless – 2.4 GHz WiFi 6; (Other protocols supported by ESP32-C6, but not mentioned in the specs here: Bluetooth 5.0 LE/Mesh, 802.15.4 radio for Zigbee 3.0 and Thread; Matter compatible)
- CPU
- USB – USB Type-C port for programming
- Wireless MCU – Espressif Systems ESP32-C6
- Antenna – External 81dBi 2.4GHz rod antenna
- Input Terminals
- L (Live), N (Neutral), PE (Protective Earthing)
- AC Rating – 100-240V~50/60Hz
- Calibration-Free Metering IC – BL0939
- 2x transformer current inputs and probes
- Detection Range: 0 to 100A (probe)
- Accuracy: 1%
- Turns Ratio: 1:2000
- Dielectric Strength: AC 3.5KV/1min 50Hz
- Range of Current Detection – 10mA-35A @ 1mΩ (energy meter)
- Active Electrical Energy – 1W to 7700W @ 1mΩ
- Dimensions – 70 x 58 x 38mm (3D printed enclosure)
The XIAO 2-Channel AC Wi-Fi Energy Meter ships pre-flashed with ESPHome firmware to monitor two independent AC circuits via Home Assistant. It’s especially useful for solar production monitoring and individual appliance tracking, as long as you can easily split the live and neutral cable since the clamp must only be placed around one of the wires, as we noted years ago when testing a “dumb” digital clamp meter.
Seeed Studio provides instructions to wire the energy meter and CT clamps, and steps to configure the Home Assistant Green gateway to work with the solution.
Seeed Studio sells the XIAO 2-ch AC WiFi Energy Meter for $29.32 on AliExpress or $28.70 on the online store. The company also told us the power meter will be available on Amazon in the next few weeks. As a comparison, the single-channel SONOFF POW Ring sells for $34.90, but it also comes with an integrated display, a built-in relay, and it supports up to 100A, while the Seeed Studio model appears to be limited to 35A based on the information in the Wiki. Paisit already reviewed the POW Ring last year, and he will get a review sample of the XIAO 2-ch AC WiFI Energy Meter soon, so we’ll see how both compare.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.
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