> For the complete documentation index, see [llms.txt](https://docs.bituo-technik.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bituo-technik.com/product-document/sdm-series/sdm01-g2x.md).

# SDM01 G2X

{% hint style="info" %}
**Status:** Preliminary | **Applies to:** SDM01G2X  | **Hardware Revision:** V1.0+ | **Last Updated:** 2026-07-28
{% endhint %}

### 1.  Introduction

<div align="left"><figure><img src="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2Fc8SV3y7crubytWhG6nKz%2FSDM01G2X_Ext-Antenna_for-website-300k.png?alt=media&amp;token=067cc253-85ae-4190-8840-e35b4e2a4746" alt="" width="254"><figcaption></figcaption></figure></div>

The **SDM01 G2X** is an ultra-slim 18mm energy meter for precise three-phase or multiple single-phase monitoring. It delivers high-speed reporting for dynamic load balancing and export limiting, alongside an external antenna for reliable connectivity.

#### Product Highlights

* **Bi-directional Power Tracking:** Delivers high-precision bi-directional monitoring for both imported energy and exported power generation.
* **Minimalist 1MW Design:** Effortlessly fits into space-constrained distribution boxes, utilizing snap-on split-core CTs for rapid, non-intrusive installation.
* **Real-Time Monitoring:** Provides continuous, live tracking of critical electrical metrics, including voltage, current, and active power.
* **Local WiFi API for HEMS:** The dedicated WiFi variant features robust local APIs, seamlessly driving dynamic load balancing (DLB) and export limitation.
* **Long-Range LoRaWAN Integration:** The LoRaWAN variant ensures reliable, long-distance data transmission, making it the ideal choice for large-scale building and infrastructure monitoring.

#### Typical Application

* Home energy management systems (HEMS)
* energy management systems (EMS) for small business&#x20;
* Energy management systems (EMS) for buildings, Infrastructure, and Industry
* Dynamic load balancing (DLB) for electrical vehicle charging
* Export limitation for renewable power generation

***

### 2. Part Description

<figure><img src="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2FEHEl6VMzHEDvJlaMLiYh%2Fimage.png?alt=media&amp;token=d67c360a-0e07-4d89-a788-97d6b98fd688" alt=""><figcaption></figcaption></figure>

<table data-header-hidden><thead><tr><th width="84.5555419921875">#</th><th width="257.666748046875">Element</th><th>Description</th></tr></thead><tbody><tr><td>1</td><td>Connector for voltage take-offs connection</td><td>The monitor is powered by AC power supply and measures voltage through four cables: X, Y, Z, and N</td></tr><tr><td>2</td><td>Connector for current transformer connection</td><td>The Red (+) and Black (-) wires of CT(X), CT(Y), and CT(Z) must match the corresponding polarity of the connector.</td></tr><tr><td>3</td><td> External Antenna Connector</td><td>For Wireless communication</td></tr><tr><td>4</td><td>Reset button</td><td>Press and hold for 3–5 seconds to enter pairing mode.</td></tr><tr><td>5</td><td>Status LED (ACT)</td><td>Indicates device operation and network status through different flashing patterns.</td></tr><tr><td>6</td><td>Alarm LED (AL)</td><td>Flashes to indicate system alarms or errors.</td></tr><tr><td>7</td><td>Product Model</td><td>Main unit product model </td></tr><tr><td>8</td><td>Locking clip for DIN rail mounting</td><td>Mounts onto a 35mm DIN rail.</td></tr><tr><td>9</td><td>Split-core CT locking clasp</td><td>Ensure the clasp is securely locked for precise measurement.</td></tr><tr><td>10</td><td>Positive power flow direction</td><td>Indicates positive power flow direction for CT(L1), CT(L1), and CT(L3) installation.</td></tr></tbody></table>

***

### 3. Technical Data

<table data-header-hidden><thead><tr><th width="342"></th><th></th></tr></thead><tbody><tr><td>Rated voltage (Input)</td><td>~220-240 VAC phase to neutral, 50/60 Hz<br>~380-415 VAC phase to phase, 50/60 Hz<sup>1)</sup></td></tr><tr><td>Max monitoring current <em>I</em><sub>max</sub></td><td>50A / 120A / 300A / 400A</td></tr><tr><td>Over-voltage category</td><td>III</td></tr><tr><td>Rated insolating voltage <em>U</em><sub>i</sub></td><td>440V</td></tr><tr><td>Rated impulse withstand voltage <em>U</em>imp</td><td>4kV</td></tr><tr><td>Pollution degree</td><td>3</td></tr><tr><td>Power Supply</td><td>100~240 VAC (L1-N)</td></tr><tr><td>Protection degree</td><td>IP20</td></tr><tr><td>Energy measurement accuracy</td><td>Class 1 (IEC 61557-12)</td></tr><tr><td>Maximum Power consumption</td><td>≤ 2VA</td></tr><tr><td>Rated operating temperature</td><td>-25℃ to 55℃</td></tr><tr><td>Main module dimension</td><td>113.7×18.0×65.9mm</td></tr><tr><td>Clamp CT apertures</td><td>Ø10 / Ø16 / Ø24 / Ø36 mm</td></tr><tr><td>Communication Type</td><td>BLE+Wi-Fi; BLE+LoRaWAN</td></tr></tbody></table>

**Remark:**\
1\) Not suitable for 3P3W installation.

***

### 4. Mechanical Outline

* **Dimension:** Unit in mm
* **Main Unit:** Monitoring module for DIN-rail installation (18mm width)

<figure><img src="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2FmDGhbqihfdG5MZQ79uZk%2FSDM01G2X-Main_Mechnical-With-Number.png?alt=media&amp;token=c1ebb93d-2690-4830-825b-b820b6d0e087" alt="" width="563"><figcaption></figcaption></figure>

* **Split-core Current Transformer - 50A (CT Clamp - 50A):**

<figure><img src="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2FSaY4TGxxEPzIqrrQXGyV%2FBSCT-10C-Cable-B.png?alt=media&amp;token=ff34bbc2-637e-44b0-a0bd-b6968e808763" alt=""><figcaption></figcaption></figure>

* **Split-core Current Transformer - 120A (CT Clamp - 120A):**

<figure><img src="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2FL9hClaStxpxhxnl7xLx9%2FBSCT-16B-Cable-B.png?alt=media&amp;token=d2ba0ca0-4ab7-4c48-b4d2-fbbc2a15e89e" alt=""><figcaption></figcaption></figure>

* **Split-core Current Transformer - 300A (CT Clamp - 300A):**

<figure><img src="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2FJXN7UEBaXeDLOfTInKtI%2FBSCT-24X.png?alt=media&amp;token=46761db4-47ef-4855-b226-556114ec94cf" alt=""><figcaption></figcaption></figure>

* **Split-core Current Transformer - 400A (CT Clamp - 400A):**

<figure><img src="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2F0uq7qDCQrQaokcflOCvU%2FBSCT-36X.png?alt=media&amp;token=54655811-5010-4cf1-9899-ac1a401be985" alt=""><figcaption></figcaption></figure>

***

### 5. Electrical Installation&#x20;

#### Wiring Diagram

**⚠️ Safety Remarks:**

* The device must be associated with easily accessible upstream protective devices ‒ such as miniature circuit breakers (MCB).
* The device must be installed, operated, serviced, and maintained **ONLY** by qualified professionals.
* Please read the user guide carefully before installation for detailed wiring diagrams and safety precautions.

<p align="center"><strong>Three-phase (3P4W) System Wiring</strong></p>

<figure><img src="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2FucRpGwFs9IKuxjIvNuBy%2FSDM01G2X-3PN-Wiringpng.png?alt=media&amp;token=7df5bd81-4f4b-4fd7-994b-04e6d6a7de87" alt=""><figcaption></figcaption></figure>

<p align="center"></p>

<p align="center"><strong>Single-phase System Wiring up to 3 Branch Circuits</strong></p>

<figure><img src="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2FbdOR8Pb6nRm27Oa33pzA%2FSDM01G2X-3x1PN-Wiring.png?alt=media&amp;token=ab4e9522-737f-40bb-842d-54f4467da442" alt=""><figcaption></figcaption></figure>

**Note:**&#x20;

1. Voltage measurement must match current measurement – V<sub>1</sub> (I<sub>1</sub>) ; V<sub>2</sub> (I<sub>2</sub>) ; V<sub>3</sub> (I<sub>3</sub>) , to measure electrical data correctly.
2. It can cause product damage, if the blue cable for N connection is connected to phase conductors by mistake

#### Installation Video

*🚧Coming soon...*

***

### 6. User Interface

#### Reset Button

Press and hold for 3–5 seconds to enter pairing mode.

#### LED Indicator

{% tabs %}
{% tab title="Tuya WiFi " %}

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-cover data-type="image">Cover image</th></tr></thead><tbody><tr><td><strong>Solid ON</strong></td><td>Device connected - the device is online and functioning normally with cloud connectivity.</td><td data-object-fit="contain"><a href="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2FkwU3dFE15wPbfD9F0pNa%2FGreen-Solid.jpg?alt=media&amp;token=25208946-1df1-4614-b704-4517fd007118">Green-Solid.jpg</a></td></tr><tr><td><strong>Flashing at 2Hz</strong></td><td>Pairing mode – press and hold the reset button until the LED flashes rapidly.</td><td data-object-fit="contain"><a href="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2FWbizEiq4JMS3j9XhBsxE%2FGreen-Flashing-at-2Hz.jpg?alt=media&amp;token=bf22526a-6206-4d63-85c2-bba85ba1ae3b">Green-Flashing-at-2Hz.jpg</a></td></tr><tr><td><strong>Flashing at 0.5Hz</strong></td><td>Reconnecting to network - the device is attempting to reconnect using saved network settings.</td><td data-object-fit="contain"><a href="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2FScRpvSt4h8Am2wmcoKxd%2FGreen-Flashing-at-0.5Hz.jpg?alt=media&amp;token=8c349252-fdd8-4395-85a7-db01b7558cdf">Green-Flashing-at-0.5Hz.jpg</a></td></tr><tr><td><strong>Flashing at 1Hz</strong></td><td>Network connected, cloud unreachable - the device is connected to Wi-Fi/Zigbee, but failed to reach the cloud.</td><td data-object-fit="contain"><a href="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2FKX5vs26feuR7YXnc2kTE%2FGreen-Flashing-at-1Hz.jpg?alt=media&amp;token=2153be0f-7635-4f9e-a44e-7064b0dc2f12">Green-Flashing-at-1Hz.jpg</a></td></tr><tr><td><strong>Flashing at 0.25Hz</strong></td><td>The device failed internal self-check. Please power off, restart, and reconfigure the network settings.</td><td data-object-fit="contain"><a href="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2FOZwF7G2PEbBtuaDzEYfW%2FGreen-Flashing-at-0.25Hz.jpg?alt=media&amp;token=82a8f1f8-d5e9-44b7-97df-7fd9cee4af83">Green-Flashing-at-0.25Hz.jpg</a></td></tr><tr><td><strong>Flashing at 1Hz</strong></td><td>Alarm reminder -<br>The device has detected a fault. Please check the wiring and power supply.</td><td data-object-fit="contain"><a href="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2Fgjz0xceslVOF4qKWMqa0%2FRed-Flashing-at-1Hz.jpg?alt=media&amp;token=202171d9-496d-4264-9b50-a7ab0d175d0c">Red-Flashing-at-1Hz.jpg</a></td></tr></tbody></table>
{% endtab %}

{% tab title="Open WiFi" %}

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-cover data-type="image">Cover image</th></tr></thead><tbody><tr><td><strong>Solid ON</strong></td><td>Wi-Fi connected, BLE disconnected - the device is connected to Wi-Fi while BLE is disconnected.</td><td data-object-fit="contain"><a href="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2FkwU3dFE15wPbfD9F0pNa%2FGreen-Solid.jpg?alt=media&amp;token=25208946-1df1-4614-b704-4517fd007118">Green-Solid.jpg</a></td></tr><tr><td><strong>Flashing at 2Hz</strong></td><td>Pairing mode – press and hold the reset button until the LED flashes rapidly.</td><td data-object-fit="contain"><a href="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2FWbizEiq4JMS3j9XhBsxE%2FGreen-Flashing-at-2Hz.jpg?alt=media&amp;token=bf22526a-6206-4d63-85c2-bba85ba1ae3b">Green-Flashing-at-2Hz.jpg</a></td></tr><tr><td><strong>Flashing at 0.5Hz</strong></td><td>Reconnecting to network - the device is attempting to reconnect both BLE and Wi-Fi using saved settings.</td><td data-object-fit="contain"><a href="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2FScRpvSt4h8Am2wmcoKxd%2FGreen-Flashing-at-0.5Hz.jpg?alt=media&amp;token=8c349252-fdd8-4395-85a7-db01b7558cdf">Green-Flashing-at-0.5Hz.jpg</a></td></tr><tr><td><strong>Flashing at 1Hz</strong></td><td>BLE connected - the LED flashes at 1Hz whenever BLE is connected, regardless of Wi-Fi status.</td><td data-object-fit="contain"><a href="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2FKX5vs26feuR7YXnc2kTE%2FGreen-Flashing-at-1Hz.jpg?alt=media&amp;token=2153be0f-7635-4f9e-a44e-7064b0dc2f12">Green-Flashing-at-1Hz.jpg</a></td></tr><tr><td><strong>Flashing at 0.25Hz</strong></td><td>The device failed internal self-check. Please power off, restart, and reconfigure the network settings.</td><td data-object-fit="contain"><a href="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2FOZwF7G2PEbBtuaDzEYfW%2FGreen-Flashing-at-0.25Hz.jpg?alt=media&amp;token=82a8f1f8-d5e9-44b7-97df-7fd9cee4af83">Green-Flashing-at-0.25Hz.jpg</a></td></tr><tr><td><strong>Flashing at 1Hz</strong></td><td>Alarm reminder -<br>The device has detected a fault. Please check the wiring and power supply.</td><td data-object-fit="contain"><a href="https://68488808-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTmsWivaZjkubbVKrCezC%2Fuploads%2Fgjz0xceslVOF4qKWMqa0%2FRed-Flashing-at-1Hz.jpg?alt=media&amp;token=202171d9-496d-4264-9b50-a7ab0d175d0c">Red-Flashing-at-1Hz.jpg</a></td></tr></tbody></table>
{% endtab %}
{% endtabs %}

***

### 7. System Integration

#### Wireless communication

Products equipped with different communication SoC firmwares connect to different systems and cloud platforms. Users can select the appropriate version based on their specific application requirements.

{% tabs %}
{% tab title="Tuya WiFi " %}
The Tuya WiFi version can only be integrated into the Tuya Cloud using Tuya's encrypted MQTT communication. It cannot be directly integrated with any third-party cloud platforms, ecosystems, or gateways. Third-party clouds or edge gateways need to be integrated via Tuya cloud APIs. For details, please refer to Tuya's developer documentation.

**Note:**&#x20;

1. Tuya's strategy for adjusting the cloud data reporting frequency is not fully disclosed. Based on the latest updates as of April 2026, provided the daily data reporting traffic limit is not exceeded, the fastest expected reporting interval will be between 5 to 15 minutes.
2. Tuya's Smart Life App is user-friendly and straightforward, making it ideal for entry-level smart home users who prefer simplicity and basic energy consumption monitoring.
   {% endtab %}

{% tab title="Open WiFi" %}
The Open Wi-Fi version of SDM01 provides the following open APIs (refer to the Device API document), enabling users to implement local automation and connect to custom cloud platforms.

1. **Zero-Configuration Discovery Mechanism (LAN Addressing)**
   * **mDNS / DNS-SD:** Supports automatic discovery of the energy meter by EV chargers and PV inverters on the Local Area Network (LAN) without the need for IP scanning.
2. **BLE Near-Field Communication Mode (Offline/Maintenance)**
   * **BLE GATT (Time-limited activation):** Requires PIN code + PAKE algorithm authentication for local high-privilege configuration and network resets. Wakes up on demand and closes upon timeout.
   * **BLE Broadcast (Always-on 24/7):** Unidirectional broadcast of AES-encrypted real-time power data, allowing nearby low-power devices to listen with zero latency and without requiring a connection.
3. **LAN Standard Mode (Ultra-low Latency Device Communication)** *Plaintext or lightweight encryption for local networks.*
   * **Modbus TCP:** Used for local linkage with EV chargers and PV inverters.
   * **Local MQTT:** Used for local integration with open-source smart home ecosystems.
   * **WebSocket (WS) / Raw UDP:** Ultra-high frequency real-time power streaming subscription (enables DLB completion within 1-2 seconds).
   * **HTTP / CoAP:** Suitable for low-frequency parameter configuration and status queries.
4. **Cloud Device Access Layer (Device-to-Cloud / Southbound API)**
   * **MQTTS (MQTT over TLS 1.2/1.3):** Core main communication link.
   * **HTTPS (OTA dedicated):** Exclusively used for downloading large Over-The-Air (OTA) firmware upgrade packages.
     {% endtab %}
     {% endtabs %}

***

### 8. Ordering Information

{% tabs %}
{% tab title="Tuya Wi-Fi" %}

<table><thead><tr><th width="58.7777099609375">#</th><th width="195.555419921875">Ordering number</th><th>Description</th></tr></thead><tbody><tr><td>1</td><td>SDM01G2X-TW-12</td><td>SDM01G2X SCTA-3×120A/Φ16 Wi-Fi (Tuya LAN+)</td></tr><tr><td>2</td><td>SDM01G2X-TW-20</td><td>SDM01G2X SCTA-3×200A/Φ20 Wi-Fi (Tuya LAN+)</td></tr><tr><td>3</td><td>SDM01G2X-TW-30</td><td>SDM01G2X SCTA-3×300A/Φ16 Wi-Fi (Tuya LAN+)</td></tr><tr><td>4</td><td>SDM01G2X-TW-40</td><td>SDM01G2X SCTA-3×400A/Φ20 Wi-Fi (Tuya LAN+)</td></tr></tbody></table>

1\) Tuya LAN+: Tuya LAN+ is a specific Wi-Fi SoC firmware provided by Tuya Smart that features local area network (LAN) communication. It is suitable for local LAN communication with products such as EV chargers, microinverters, and micro-energy storage systems that are also equipped with Tuya LAN+ communication firmware. This model can only be purchased through Tuya's official or designated channels.
{% endtab %}

{% tab title="Open Wi-Fi" %}

<table><thead><tr><th width="58.7777099609375">#</th><th width="195.555419921875">Ordering number</th><th>Description</th></tr></thead><tbody><tr><td>1</td><td>SDM01G2X-EW-12</td><td>SDM01G2X SCTA-3×120A/Φ16 Open Wi-Fi</td></tr><tr><td>2</td><td>SDM01G2X-EW-20</td><td>SDM01G2X SCTA-3×200A/Φ20 Open Wi-Fi</td></tr><tr><td>3</td><td>SDM01G2X-EW-30</td><td>SDM01G2X SCTA-3×300A/Φ16 Open Wi-Fi</td></tr><tr><td>4</td><td>SDM01G2X-EW-40</td><td>SDM01G2X SCTA-3×400A/Φ20 Open Wi-Fi</td></tr></tbody></table>
{% endtab %}
{% endtabs %}

***

***

### 9. FAQ&#x20;

{% content-ref url="/pages/149DFxm5iomFCS9alhv5" %}
[FAQ](/faq/overview.md)
{% endcontent-ref %}

***

### 10. Troubleshooting

{% content-ref url="/pages/td5Nnli4rm9AAhvTaYLk" %}
[Troubleshooting](/troubleshooting/overview.md)
{% endcontent-ref %}

***

### 11. Printed User Guide

{% file src="/files/FhTrHrYHtJSowmhzH6Fy" %}

### 12. Explore More