Description
SONOFF POWCT is a smart power meter built for circuit-level energy visibility, non-invasive current measurement, and automation-ready load control. This POW Ring Smart Power Meter uses a 100A split-core CT sensor, so installers can clamp around the target conductor without cutting live wires, making it a practical option for home distribution boxes, appliance circuits, and light industrial monitoring.
According to the official SONOFF materials, POWCT supports real-time energy monitoring, bidirectional power flow tracking for solar export scenarios, 6-month history records, and a 2A dry contact relay for external contactor switching. That combination makes this SONOFF smart power meter useful both as an energy dashboard and as a trigger source for smarter electrical load management.
Features
- 100A split-core current transformer: non-invasive current sensing without direct contact with live wires.
- Real-time energy monitoring: track power usage by room, circuit, or appliance from the electrical panel.
- Bidirectional solar monitoring: monitor both grid consumption and exported energy in supported solar setups.
- Dry contact relay: the official page highlights a 2A dry contact output for external contactor switching.
- 6-month historical records: hour-level data can be reviewed and exported for reporting or optimization.
- LCD local visibility: the front display keeps key values available on site instead of app-only monitoring.
- ESP32 platform: the official specification and graphics identify an ESP32-based hardware platform.
Specifications
| Product Name | SONOFF POW Ring Smart Power Meter |
| Model | POWCT |
| Function | Wi-Fi smart power meter with split-core CT sensor |
| MCU | ESP32 |
| Rating | 100-240V~ 50/60Hz 2W |
| Wireless Connectivity | Wi-Fi IEEE 802.11 b/g/n 2.4GHz |
| Antenna Interface | SMA |
| Transformer Interface | RJ9 |
| Transformer Current Detection Range | 0-100A |
| Measurement Category | CAT II 0-100A 300V~ MAX |
| Net Weight | 120g (accessories not included) |
| Product Dimension | 98 x 54 x 31mm |
| Color | White |
| Casing Material | PC |
| Applicable Place | Indoor |
| Working Temperature | -40C to 50C |
| Working Humidity | 5% to 95% RH, non-condensing |
Applications
- Home circuit monitoring for rooms, branches, and higher-consumption appliances.
- Solar self-consumption tracking where bidirectional power flow needs to be visible.
- Energy budgeting and diagnostics using historical data from eWeLink exports.
- External contactor control for larger electrical loads that need indirect switching logic.
- Panel-level monitoring projects that need a compact Wi-Fi smart power meter with CT clamp installation.
Product List
- 1 x SONOFF POW Ring Smart Power Meter
- 1 x Split-core current transformer clamp
- 1 x Antenna
Other Content
POWCT is intended for installation inside a distribution box and the official manual notes that, when the enclosure is metal, the antenna should be placed externally. The same manual also notes that antenna and CT wiring should avoid crossing high-voltage busbars and sharp edges, which is a practical installation point for this smart power meter.
The official product material also shows how SONOFF POWCT can be used in uni-directional and bi-directional measurement modes. That makes this 100A CT smart power meter a strong fit for users who want one device for ordinary consumption monitoring and solar energy export visibility.
Resources
FAQ
Q: What does SONOFF POWCT measure?
A: POWCT measures electrical usage with a 100A split-core CT sensor and can show power data for circuits, rooms, or specific appliances.
Q: Is this smart power meter suitable for solar systems?
A: Yes. Official materials state that SONOFF POWCT supports bidirectional power flow tracking, so it can help monitor exported solar energy as well as grid consumption.
Q: Does POWCT require direct contact with live wires?
A: No. The official description emphasizes a split-core clamp design for non-invasive monitoring.
Q: Can this smart power meter control larger loads?
A: It can provide a 2A dry contact relay output for external contactor switching, which is useful when direct high-load switching is not appropriate.
Q: Can I review historical records from POWCT?
A: Yes. Official materials mention up to 6 months of historical data with export support for analysis or reporting.