SONOFF POW Ring Smart Power Meter
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SONOFF POW Ring Smart Power Meter
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.
1. General Shipping Information
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- Please make sure your shipping address is accurate before placing your order. We ship strictly according to the address provided at checkout.
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2. Shipping Rates & Options
Shipping rates are calculated based on order value, destination, and available shipping methods. The final available options will be displayed at checkout.
2.1 Germany Domestic Shipping
| Shipping Method | Order Value | Cost | Est. Delivery |
|---|---|---|---|
| Deutsche Post | €0.00 - €50.00 | €4.95 | 2-4 Business Days |
| Deutsche Post | Over €50.00 | Free | 2-4 Business Days |
|
DHL Paket (Faster Delivery) |
€0.00 - €50.00 | €6.95 | 1-3 Business Days |
|
DHL Paket (Faster Delivery) |
€50.00 - €100.00 | €2.00 | 1-3 Business Days |
|
DHL Paket (Faster Delivery) |
Over €100.00 | Free | 1-3 Business Days |
2.2 Selected EU Countries / Regions
Available EU shipping destinations are shown at checkout based on your shipping address. For orders shipped to selected EU countries or regions outside Germany, we use FedEx Regional Economy.
| Shipping Method | Order Value | Cost | Est. Delivery |
|---|---|---|---|
| FedEx Regional Economy | €0.00 - €100.00 | €7.95 | 3-5 Business Days |
| FedEx Regional Economy | Over €100.00 | Free | 3-5 Business Days |
EU orders may be fulfilled from our Munich warehouse or, when applicable, from our Shenzhen warehouse depending on inventory availability. For EU member states, OpenELAB covers applicable import duties and taxes under DDP service where required.
2.3 United States
| Region | Shipping Method | Order Value | Cost | Est. Delivery |
|---|---|---|---|---|
|
Continental U.S. (50 States) |
USPS Ground Advantage | €0.00 - €45.00 | €4.95 | 3-7 Business Days |
| USPS Ground Advantage | Over €45.00 | Free | 3-7 Business Days | |
| USPS Priority Mail | €0.00 - €45.00 | €16.95 | 1-4 Business Days | |
| USPS Priority Mail | Over €45.00 | €14.95 | 1-4 Business Days | |
|
Non-Continental U.S. (AK, HI, PR, etc.) |
USPS Ground Advantage | €0.00 - €60.00 | €6.95 | 5-9 Business Days |
| USPS Ground Advantage | Over €60.00 | Free | 5-9 Business Days |
Non-Continental U.S. regions include Alaska, American Samoa, Guam, Hawaii, the Marshall Islands, the Northern Mariana Islands, Palau, Puerto Rico, the U.S. Virgin Islands, and U.S. Armed Forces addresses.
2.4 International Destinations Outside the EU
For selected international destinations outside the EU, including Switzerland, the United Kingdom, and Norway, shipping rates are as follows:
| Order Amount | Shipping Cost |
|---|---|
| €0.00 - €300.00 | €19.95 |
| Over €300.00 | Free |
For non-EU destinations, import duties, taxes, and customs fees may be charged by the destination country and are the responsibility of the recipient.
3. Warehouses & Fulfillment
Our products may be stored in our Munich, Arlington, and Shenzhen warehouses. The actual shipping warehouse depends on product availability and destination.
3.1 Munich Warehouse
For products stored in our Munich warehouse, we use Deutsche Post or DHL Paket for domestic deliveries within Germany. For selected EU destinations outside Germany, we use FedEx Regional Economy.
3.2 Arlington Warehouse
For products stored in our Arlington warehouse, we use USPS or UPS for deliveries within the United States.
3.3 Shenzhen Warehouse
For pre-order items or products fulfilled directly from our Shenzhen warehouse, we arrange reliable international shipping based on destination and inventory status. For EU member states, OpenELAB covers applicable import duties and taxes under DDP service where required.
4. Inventory, Pre-orders & Split Shipments
- Inventory Status: Please check the product page for real-time stock information. If an item is out of stock in our local warehouses, it may be marked as “Pre-order”.
- Pre-order Fulfillment: Pre-order items may be shipped directly from Shenzhen or restocked to a local warehouse first before final delivery.
- Split Shipments: If your order contains both in-stock and pre-order items, we may ship them separately. No additional shipping fee will be charged for split shipments caused by our fulfillment arrangement.
5. Customs, Taxes & Delivery Issues
5.1 Customs and Taxes
For EU Member States:
Whether shipped from Germany or China, OpenELAB covers applicable import duties and taxes under DDP service where required. Customers in EU member states should not be charged additional import duties or VAT upon delivery.
For destinations outside the European Union, such as Switzerland, Norway, and the United Kingdom, import duties, taxes, and customs fees may be charged by local authorities upon delivery. These fees are the responsibility of the recipient.
5.2 Damaged, Delayed, or Lost Parcels
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If your parcel is delayed, lost, returned to sender, or the tracking information has not updated for an unusual period of time, please contact us at info@openelab.io. We will assist you in checking the shipment status with the courier.
5.3 Incorrect Address or Failed Delivery
If a parcel cannot be delivered due to an incorrect or incomplete address provided by the customer, refusal of delivery, or failure to collect the parcel, additional shipping or return costs may apply.
6. VAT
For orders within the EU, VAT is collected at checkout according to the applicable destination rules. No additional VAT should be collected upon delivery for EU member state orders covered under our DDP shipping arrangement.



