SDM01/Combo Compact Energy Meter

Yes. Among the three SDM01 versions, the BLE + Wi-Fi + RS485 model is specifically optimized for export-limiting applications.

- Wi-Fi (Modbus TCP/UDP) for Balcony PV and ESS
The Wi-Fi interface supports both Modbus TCP and UDP with fast power data reporting, making it well-suited for balcony PV and ESS export limiting scenarios. A one-click API switching feature is also available to ensure seamless compatibility with Shelly 3EM Pro over Modbus TCP or UDP.

- RS485 (Modbus RTU) for Residential PV and ESS
In addition to its own Modbus register list, the SDM01 can follow the register mappings of several popular meters via RS485 Modbus RTU. This enables integration for export limiting or dynamic load balancing with systems using ABB B23, Chint DDSU666 / DDTU666 (MID version), and Eastron SDM230 / SDM630.

Yes. For bulk orders, you can refer to our Bulk Sales policy.

If you are interested in becoming a certified reseller, system integrator, or installer, you are also welcome to contact us directly via the email, WeChat, or WhatsApp details provided in the page footer.

Orders are dispatched from our warehouse in Shanghai. Under normal conditions, delivery to most countries worldwide takes around 7–14 days.

We are also in the process of establishing a stock location in Germany, expected to be ready by the end of 2025. Once operational, delivery times to EU countries will be further reduced.

The SDM01 provides Class 1 accuracy for both active power and active energy. Every unit is individually calibrated before leaving the factory to ensure reliable measurement performance.

We follow the IEC 61557-12 standard, which defines accuracy requirements for Power Metering and Monitoring Devices (PMDs). For those interested in further reading, the two-part blog series “Understanding the IEC 61557-12 Standard That Makes Meter Comparisons Easier-Part 1 and Part 2” by Mr Franck Gruffaz offers a clear introduction to the standard and its practical relevance.

There are three commissioning methods:

1) Using the BT Powerlink App

You can configure the device via Bluetooth using our official mobile app.

• Android: https://play.google.com/store/apps/details?id=btpowerlink.APP
  
• iOS: https://apps.apple.com/us/app/bt-powerlink/id6738687359?platform=iphone
  

2) Using our Windows configuration tool

Wi-Fi credentials can also be provisioned through BLE using our Windows application.

3) Integrating with your own app

If you prefer to configure the device through your own mobile application, please contact us for the BLE API documentation.

Yes. SDM01 can monitor up to three 220–240 VAC single-phase circuits.

For single-phase wiring, tie L1/L2/L3 to the same live L (neutral to N), and place each CT on its respective branch. See the Wiring Diagram for the 1P+N (max 3 circuits) layout.

All three versions support Modbus RTU, but their compatibility ranges differ:

• SDM01-TWM-* (Tuya Wi-Fi + RS485)
  
  Only maps the Modbus register addresses of:
  
  • Chint DDSU666 / DDTU666 (MID version)
  
  • Eastron SDM230 / SDM630
  
• SDM01-EWM-* and SDM01-TZM-*-U01
  
  In addition to the above meters, they also support the Modbus register mapping of:
  
  • ABB B23
  

Important note:

This compatibility is focused on HEMS use cases. Only the key registers for voltage, current, power, and energy are mapped—sufficient for export limiting and dynamic load balancing.

For full parameter access, you can use the native Bituo Modbus register list.