Product Overview
Introduction
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Product Name |
SONOFF POW Ring Smart Power Meter |
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Product Model |
POWCT is a Wi-Fi-based smart power monitoring switch that supports external split-core current transformers (CT) for applications involving high-power equipment. The device provides real-time monitoring of voltage, current, power, accumulated energy consumption, and even accumulated energy export. Through the eWeLink app, users can remotely manage the device and create smart scenes, improving electrical safety and energy efficiency.
Highlights
- Split-Core CT Sensor – Safe, Non-Invasive Installation
Monitor currents up to 100A without touching live wires.
The snap-open split-core design with side latches makes installation quick, safe, and tool-free—perfect for both DIY enthusiasts and professional electricians.
- Real-Time Energy Monitoring – Circuit-Level Precision
Install POWCT in your breaker panel to monitor energy usage by circuit, room, or high-power appliances. Get actionable insights to reduce energy waste, track usage trends, and take full control of your electricity bills.
- Track Exported Power – Smarter Solar Optimization
POWCT isn't just a consumption meter—it tracks bidirectional energy flow, including power exported to the grid. Ideal for solar and battery setups, it helps you monitor generation, maximize self-consumption, and boost ROI on your solar investment.
- 6-Month Historical Data – Auto-Logged & Free-Exportable
Access detailed hour-by-hour power usage history for up to 6 months. Easily export the data for in-depth analysis, energy audits, or sustainability reporting.
- Dry Contact Output – Control Heavy Loads with Ease
Features a built-in 2A dry contact relay, ready to link with external contactors to control large loads safely. A smart solution for industrial-grade automation and energy-efficient load management.
Applications
- Real-Time Monitoring of High-Power Equipment
Ideal for use with industrial machines, HVAC systems, water pumps, or EV chargers. Monitor voltage, current, and power usage in real time through the eWeLink app.
- Home Energy Management
Track household energy consumption patterns over time. Use historical data to identify high-usage appliances and reduce unnecessary energy costs.
- Solar Power Systems
With energy export tracking, POWCT is suitable for homes or small businesses equipped with solar panels—monitor both energy consumption and the amount of electricity fed back into the grid.
- Energy Efficiency for Small Businesses
Use POWCT to optimize power usage in offices, workshops, or small commercial setups—monitor peak usage times and reduce standby losses.
- etc...
Specification
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Model |
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MCU |
ESP32 |
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Rating |
100-240V~ 50/60Hz 2W |
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Wireless Connectivity |
Wi-Fi IEEE 802.11 b/g/n 2.4GHz |
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Antenna interface type |
SMA |
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Transformer interface type |
RJ9 |
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Transformer current detection range |
0-100A |
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Net weight |
120g (Accessories not included) |
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Product dimension |
98x54x31mm |
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Color |
White |
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Casing material |
PC |
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Applicable place |
Indoor |
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Working temperature |
-40℃~50℃ |
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Working humidity |
5%~95% RH, non-condensing |
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Certification |
CE/FCC/RoHS |
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Executive standard |
EN IEC 61010-2-030 |
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Measurement Category |
CAT II 0-100A 300V~ MAX |
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Altitude |
Up to 2000m |
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MAINS supply voltage fluctuations |
±10% |
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OVERVOLTAGE CATEGORY |
OCV2 |
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If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. |
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A suitable circuit-breaker must be included in the installation when install the device. The circuit-breaker is used as disconnect device, it must be suitably located and easily reached. |
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eWeLink Key Features
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Notice: After installation and pairing, select the measurement mode —Unidirectional Measurement, or Bi-directional Measurement in the eWeLink app based on your specific application scenario. |
Uni-directional Measurement
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Device Home Page Functions |
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Key Features |
Feature Description |
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On / Off |
Device on/off state. |
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Energy Monitoring |
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Schedule |
Set the device to complete the specified action at the specified time. |
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Timer |
Set delayed actions for the device to execute after a specified time |
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Loop Timer |
The device executes a predefined action cyclically at specified time intervals. |
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Device Settings |
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Key Features |
Feature Description |
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Third-party Platforms |
Alexa |
You can control your smart devices through third-party services, including voice control. |
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Google Home |
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IFTTT |
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SmartThings |
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Alice |
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Assign location |
Set up the home and room where the device is located. |
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Share |
The device can be shared with other eweLink accounts. |
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Create Group |
After multiple devices are created into a group, you can synchronize all devices in the group. |
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Smart Scene |
Trigger Condition |
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Execution Action |
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LAN Control |
A control method where the app communicates directly with the device over the same router, without going through the cloud platform.
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Measurement Mode |
Uni-directional Measurement |
The line current must match the direction of the arrow on the current transformer. |
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Bi-directional Measurement |
Energy consumption is measured when the line current matches the direction of the arrow on the current transformer; energy export is measured when the direction is reversed. |
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Threshold Settings |
Power |
*For device and personal safety, default power protection is enabled. The maximum allowable load power is 24000W. |
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Voltage |
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Current |
*For device and personal safety, the default current protection is enabled. The maximum allowable load current is 101A. |
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Rest Total Energy |
Reset the consumption on the device screen to 0 kWh. |
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Push Notice |
After turning on "Push notifications", also make sure to grant notification permissions in Phone Settings > Permissions for the eWeLink app. This allows you to receive push notifications when the device status changes.
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Offline Alert |
Turn on the "Offline Notifications" feature, and grant eWeLink notification permissions in Phone Settings > Permissions. You will receive a mobile push notification 5 minutes after the device goes offline.
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Logs |
Records of device status changes. (You can view the operation records of the past three months) |
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Network Indicator |
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Power-on State |
The switch state of the device when power is restored after a power outage.
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Inching Settings |
The device automatically turns off/turns on after being on for a specified duration.
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Wi-Fi Settings |
Configure the WiFi network connected to the device. |
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Delete Device |
Remove the device from the eWeLink platform. |
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Bi-directional Measurement
|
Device Home Page Functions |
|
|
Key Features |
Feature Description |
|
On / Off |
Device on/off state. |
|
Energy Monitoring |
|
|
Schedule |
Set the device to complete the specified action at the specified time. |
|
Timer |
Set delayed actions for the device to execute after a specified time |
|
Loop Timer |
The device executes a predefined action cyclically at specified time intervals. |
|
Device Settings |
||
|
Key Features |
Feature Description |
|
|
Third-party Platforms |
Alexa |
You can control your smart devices through third-party services, including voice control. |
|
Google Home |
||
|
IFTTT |
||
|
SmartThings |
||
|
Alice |
||
|
Assign location |
Set up the home and room where the device is located. |
|
|
Share |
The device can be shared with other eweLink accounts. |
|
|
Create Group |
After multiple devices are created into a group, you can synchronize all devices in the group. |
|
|
Smart Scene |
Trigger Condition |
|
|
Execution Action |
|
|
|
LAN Control |
A control method where the app communicates directly with the device over the same router, without going through the cloud platform.
|
|
|
Measurement Mode |
Uni-directional Measurement |
The line current must match the direction of the arrow on the current transformer. |
|
Bi-directional Measurement |
Energy consumption is measured when the line current matches the direction of the arrow on the current transformer; energy export is measured when the direction is reversed. |
|
|
Threshold Settings |
Power |
*For device and personal safety, default power protection is enabled. The maximum allowable load power is 24000W. |
|
Voltage |
|
|
|
Current |
*For device and personal safety, the default current protection is enabled. The maximum allowable load current is 101A. |
|
|
Rest Total Energy |
Reset the total energy data (consumption/export) on the device screen to 0 kWh.
|
|
|
Push Notice |
After turning on "Push notifications", also make sure to grant notification permissions in Phone Settings > Permissions for the eWeLink app. This allows you to receive push notifications when the device status changes.
|
|
|
Offline Alert |
Turn on the "Offline Notifications" feature, and grant eWeLink notification permissions in Phone Settings > Permissions. You will receive a mobile push notification 5 minutes after the device goes offline.
|
|
|
Logs |
Records of device status changes. (You can view the operation records of the past three months) |
|
|
Network Indicator |
|
|
|
Power-on State |
The switch state of the device when power is restored after a power outage.
|
|
|
Inching Settings |
The device automatically turns off/turns on after being on for a specified duration.
|
|
|
Wi-Fi Settings |
Configure the WiFi network connected to the device. |
|
|
Delete Device |
Remove the device from the eWeLink platform. |
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Installation and Configuration Guide
① Antenna interface
② Button
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Button |
Description |
|
Single press |
Turn on/off the device |
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Press & hold 5 seconds |
Device enters the pairing mode (Pairing time 10 minutes) |
③ LED screen
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LED screen |
Description |
|
>10000W |
When the measured power value exceeds 10,000W, the display screen will show the numerical value in scientific notation. For example, "10E3" represents 10kW, and "24E3" represents 24kW. |
④ Protective cover
⑤ Transformer interface
⑥ Power LED indicator (Red)
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Power LED indicator (Red) |
Description |
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Keeps on |
Device is on |
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Keeps off |
Device is off |
⑦ Wi-Fi LED indicator (Blue)
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Wi-Fi LED indicator (Blue) |
Description |
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Keeps on |
Online |
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Flashes two short + one long |
In Pairing Mode |
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Flashes once |
Failed to connect to the router |
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Flashes twice |
Connected to the router but failed to connect to the server |
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Flashes three times |
OTA |
⑧ Mounting base
⑨ Wiring terminals (Visible after removing the protective cover)
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Terminals |
Description |
|
NO |
Normally Open (Output Terminal) |
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COM |
Common (Output Terminal) |
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L |
Live (Input Terminal) |
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N |
Neutral (Input Terminal) |
Wiring Diagrams
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WARNING:
|
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1. Install the current transformer and antenna. |
2. Remove protective cover. |
3. Paired with a current transformer to monitor the power consumption of household appliances. |
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4. Test the current direction. |
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|
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Notice:
The current direction in the line should match the arrow direction on the current transformer (P1 → P2, see Figure 2).
Energy consumption is measured when the line current matches the direction of the arrow on the current transformer; energy export is measured when the direction is reversed(P2 → P1). |
Installation
|
Notice:
|
Add Device
Open a eWeLink to scan the QR code on the Quick Guide or the device itself to add the device.
|
Enter "Scan". |
Scan the QR code on the back of the quick guide. |
Select "Add Device". |
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(Two short and one long flashes). |
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Device added completely. |
FAQ
1. Does POWCT require a neutral wire for installation?
Yes. A neutral wire is required for the correct installation and operation of the device.
2. Can I use POWCT to control the power of a connected device?
Yes. POWCT supports remote ON/OFF control via the eWeLink app, allowing you to switch the connected load on or off.
3. Is real-time power monitoring supported?
Yes. You can monitor voltage, current, power, and energy consumption in real time through the eWeLink app.
4. Does it support overload protection?
Yes, overload protection is supported. You can set threshold limits directly in the eWeLink app. When the current, voltage, or power exceeds the set value, the device will automatically shut off to prevent damage.
Troubleshooting
1. Cannot pair with Wi-Fi
Make sure the device is in pairing mode.
Make sure your mobile device and POWCT are on the same 2.4GHz Wi-Fi.
2. POWCT is paired but cannot be controlled remotely
Check if the device is powered on and the LED is steadily lit (indicating a successful connection).
Ensure your phone has internet access.
Try rebooting the router and the device or re-pairing it via the app.
3. POWCT shows offline in the app
Ensure the device has not lost power.
Check Wi-Fi coverage and avoid placing the device too far from the router.
Try rebooting or resetting the device if the issue persists.
4. How to change the POWCT's Measurement Mode
Complete the current transformer clamp installation based on your specific application scenario.
Add the device to the eWeLink app following the standard pairing process. In the eWeLink app, go to: Device Settings >> Measurement Mode, and select the appropriate detection mode that fits your setup.