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Bituo Technik

SDM01/COMBO Compact Energy Meter

SDM01/COMBO Compact Energy Meter

€70,16
€70,16
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Connectivity
Maximu Monitoring Current
The SDM01 Smart Energy Monitor is a compact 18mm-wide DIN-rail device for real-time three-phase and multi-branch single-phase monitoring. With three split-core CTs, it precisely measures voltage, current, power, and energy, supporting wired and wireless communication for seamless integration.

- Bi-directional Measurement: Measure power and energy flow in both consumption and generation.
- Easy Installation: The monitoring module requires just 1MW at DIN rail, paired with compact split-core CTs.
- Local Automation: Enable local UDP broadcasting and HTTP requests, ideal for DLB and zero export for Home Energy Management Systems (HEMS).
- Real-time Monitoring: Monitor key electrical data like Voltage, Current, and Power in real time.
- Versatile Connectivity: Choose from various communication options such as Wi-Fi, Zigbee, Modbus, etc., catering to diverse system integration needs.
- Modbus Support: Modbus version & hybrid WiFi/Zigbee+Modbus variants are available for industrial installations.

Download: Datasheet | Manual

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Variant Variant total Quantity Price Variant total
Tuya Wi-Fi+485 / 120A
Tuya Wi-Fi+485 / 120A
€70,16/ea		 €0,00
€70,16/ea €0,00
Tuya Wi-Fi+485 / 200A
Tuya Wi-Fi+485 / 200A
€90,16/ea		 €0,00
€90,16/ea €0,00
Open Wi-Fi+485 / 120A
Open Wi-Fi+485 / 120A
€70,16/ea		 €0,00
€70,16/ea €0,00
Open Wi-Fi+485 / 200A
Open Wi-Fi+485 / 200A
€90,16/ea		 €0,00
€90,16/ea €0,00
Std. Zigbee 3.0+485 / 120A
Std. Zigbee 3.0+485 / 120A
€73,89/ea		 €0,00
€73,89/ea €0,00
Std. Zigbee 3.0+485 / 200A
Std. Zigbee 3.0+485 / 200A
€93,89/ea		 €0,00
€93,89/ea €0,00
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Reset Button

Hold for 3–5 seconds to activate 2.4GHz wireless communication pairing or to reset the configuration.

RS485 Connector

Modbus RTU connectivity for export limiting, dynamic load balancing, and general monitoring.

Clamp CT Connector

Withdrawable terminals designed for safe and convenient connection of clamp CTs.

Indicator Light

Status LED (ACT) shows device operating status, while Alarm LED (AL) flashes to indicate system faults or errors.

Voltage Take-offs Connector

Industrial-grade withdrawable connector for reliable voltage measurement and power wiring.

Clamp CTs

High-precision 16mm aperture split-core CTs, calibrated with the main module to meet IEC 61557-12 Class 1 accuracy of active energy.

Technical Information

  • Rated voltage Un: 220-240(L-N)/380-415 VAC(L-L), 50/60Hz
  • Max current Imax: 120 A / 200 A
  • Over-voltage category: III
  • Rated insulating voltage Ui: 440 V
  • Rated impulse withstand voltage Uimp: 4 kV
  • Pollution degree: 3
  • Protection degree: IP20
  • Energy measurement accuracy: Class 1 (Active energy, IEC 61557-12)
  • Maximum power consumption: ≤ 2 VA
  • Rated operating temperature: -25~70 ℃
  • Communication type:
    - Wireless: Wi-Fi / Zigbee
    - Wired: RS485

Select the Connectivity that Meets Your Needs

SDM01-TWM-*

SDM01-EWM-*

SDM01-TZM-*-U01
Communication Wi-Fi + 485 BLE + Wi-Fi + 485 Zigbee + 485
Wireless Communication API Tuya Proprietary Modbus TCP, MQTT, HTTP, UDP, BLE Standard Zigbee 3.0 Clusters / Attributes
Wired Communication API Modbus RTU Modbus RTU Modbus RTU
Compatible Wireless Communication API Tuya Proprietary Modbus TCP & UDP options -Bituo SDM01 or Shelly 3EM Pro Standard Zigbee 3.0 Clusters / Attributes
Compatible Wired Communication API Modbus RTU - Chint DDSU666/DDTU666 (MID version) and Eastron SDM230/630 Modbus RTU - ABB B23, Chint DDSU666/DDTU666 (MID version), and Eastron SDM230/630 Modbus RTU - ABB B23, Chint DDSU666/DDTU666 (MID version), and Eastron SDM230/630
Export Limiting Modbus RTU Modbus TCP / UDP / Modbus RTU Modbus RTU
Dynamic Load Balancing Modbus RTU Modbus TCP / UDP / Modbus RTU Modbus RTU
Smart Home System Integration Tuya/Smart Life Home Assistant Home Assistant, SmartThings, Homey
Wireless Communication SoC Firmware Customization Yes (In collarboration with Tuya) Yes (ESP32-8685) Yes (EFR32MG21)
Recommended Users Energy IoT Beginners Professional DIYers, PV/ESS Installers System Integrators

FAQ

Does SDM01 support solar export limiting?

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.

Can I get a discount if I buy more units?

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.

How long does it take to ship after placing an order?

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.

What is the measurement accuracy of SDM01 for power and energy?

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.

How do I set up Wi-Fi for the SDM01 BLE + Wi-Fi + RS485 version?

There are three commissioning methods:

1) Using the BT Powerlink App

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

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.

Can I use SDM01 for single-phase application?

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.

What are the Modbus RTU differences across the three SDM01 versions?

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.

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