1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your Blindsmart Smart Home Energy Monitor (Zigbee Version). This device is designed to provide real-time and precise monitoring of your home's electricity usage, supporting both consumption and generation for single-phase 3-wire systems. It integrates with smart home platforms like Home Assistant via Zigbee2MQTT and the Tuya Smart / Smart Life App.
Image 1.1: Blindsmart Smart Home Energy Monitor with Current Transformers (CTs) and mobile application display.
2. Safety Information
WARNING: Electrical installation should only be performed by qualified personnel. Turn off all power supply sources before installing or performing maintenance on this equipment.
- Always disconnect power at the main circuit breaker before beginning any electrical work.
- Ensure all connections are secure and comply with local electrical codes.
- Do not install the device in wet or damp locations.
- Do not exceed the specified current and voltage ratings of the device.
- The device is not waterproof. Install in a protected enclosure.
3. Package Contents
Verify that all items are present in the package:
- 1x Smart Energy Monitor Module
- 2x 120A Split-Core Current Transformers (CTs)
- 1x User Manual (this document)
4. Product Features
- Real-Time & Precise Energy Monitoring: Tracks voltage, current, power, and total energy consumption with Class 1 accuracy.
- Bi-Directional Power Monitoring: Accurately measures both energy consumption and power export, ideal for solar and battery systems.
- Easy Installation: Features pluggable terminals and compact split-core CTs for simplified setup.
- Smart App Integration: Compatible with Tuya Smart / Smart Life App for data visualization, alerts, and home automation scenes.
- Home Automation Support: Seamlessly integrates with Home Assistant via Zigbee2MQTT.
- Advanced Energy Management: Supports Dynamic Load Balancing (DLB) and zero grid export for Home Energy Management Systems (HEMS).
5. Specifications
| Product Model | SDM02T-TZ |
| Rated Operating Voltage Un | 110-240 VAC L-N, 50/60 Hz |
| Max Current Imax | 120 A |
| Over-voltage Category | III |
| Rated Insulating Voltage Ui | 250 V |
| Rated Impulse Withstand Voltage Uimp | 4 kV |
| Pollution Degree | 3 |
| Protection Degree | IP20 |
| Energy Measurement Accuracy Class (IEC61557-12) | Class 1 |
| Rated Operating Temperature | -25~70 °C |
| Maximum Power Consumption | ≤ 2 VA |
| Dimensions (Monitor) | 1.65 x 1.65 x 0.82 inches (42 x 42 x 21 mm) |
| Item Weight | 11.5 ounces |
Image 5.1: Detailed product dimensions and technical specifications.
6. Setup
6.1. Prerequisites
A Tuya Zigbee hub or a Zigbee2MQTT dongle is required for the monitor to function and integrate with smart home systems. These are not included with the product.
Image 6.1: The energy monitor requires a Tuya Zigbee Hub or Zigbee2MQTT dongle for connectivity.
6.2. Component Identification
Familiarize yourself with the main components of the energy monitor:
Image 6.2: Identification of the monitor module, split-core CTs, reset button, status LED, and wiring terminals.
- Monitor (Monitoring module): The main unit that processes data.
- Split-core CTs (Detection module): Two current transformers that measure current flow.
- Reset button: Used for pairing and resetting the device.
- Status LED: Indicates device status (e.g., pairing mode).
- Pluggable terminals for voltage wire: Connects to L1, L2, and N for voltage sampling.
- Pluggable terminals for current transformer wire: Connects to the CTs.
Ensure the red wire of the CT is connected to "+" and the black wire to "-" at the connector.
6.3. Wiring Installation
IMPORTANT: Turn off all power at the main breaker before proceeding with wiring. Consult a qualified electrician if you are unsure about any steps.
The SDM02T-TZ is suitable for UL single-phase (split-phase) three-wire systems and UL/IEC single-phase systems up to two branch circuits.
Image 6.3: Wiring diagrams for common electrical systems. Note the direction of current flow for CTs.
- Connect Voltage Wires: Connect the L1, L2, and N terminals of the monitor to the corresponding live (L1, L2) and neutral (N) lines of your electrical panel.
- Install Current Transformers (CTs):
- Open the split-core CTs.
- Place one CT around each main live wire (L1 and L2) coming into your circuit breaker box.
- Ensure the arrow on the CT points in the direction of current flow (towards the load for consumption monitoring, away from the load for generation monitoring).
- Close the CTs securely.
- Connect CT Wires: Connect the wires from the CTs to the designated current transformer input terminals on the monitor module. Ensure correct polarity (red to '+' and black to '-').
- Secure the Monitor: Mount the monitor module in a suitable, protected location within the electrical panel, ensuring it is not exposed to moisture.
Note: The SDM02 can only be installed upstream if associated with a contactor, frequency converter, or motor starters.
6.4. Pairing with Zigbee Network
After successful wiring and restoring power:
- Ensure your Tuya Zigbee Hub or Zigbee2MQTT dongle is powered on and in pairing mode.
- Press and hold the reset button on the energy monitor for a few seconds until the Status LED starts flashing. This indicates pairing mode.
- Follow the instructions in your Tuya Smart / Smart Life App or Home Assistant (via Zigbee2MQTT) to discover and add the new device.
- Once successfully paired, the Status LED will stop flashing and remain solid or turn off, depending on the device's status.
7. Operation
7.1. Tuya App Monitoring
Once paired with a Tuya Zigbee Hub, you can monitor key electrical data in real-time via the Tuya Smart / Smart Life App.
Image 7.1: Tuya App display for real-time monitoring of voltage, current, active power, and energy consumption.
- Real-time Data: View current (A), active power (kW), voltage (V), and frequency.
- Energy Consumption Statistics: Access daily, monthly, and yearly energy usage graphs.
- Alarm Messages: Set up various alarms (high-power, over-current, under-voltage, etc.) in the app settings to receive notifications when electrical data is abnormal.
Image 7.2: Configuration of various alarm thresholds within the Tuya App.
7.2. Home Assistant Integration (via Zigbee2MQTT)
For users utilizing Home Assistant with a Zigbee2MQTT dongle, the energy monitor provides real-time data directly to your Home Assistant dashboard.
Image 7.3: Home Assistant dashboard showing detailed electrical measurements from the energy monitor.
7.3. Bi-Directional Measurement
The monitor accurately measures both energy consumed from the grid and energy exported to the grid, crucial for solar and battery storage systems.
Image 7.4: Illustration of bi-directional power flow, showing energy from non-fossil sources, solar, grid, and home consumption.
Note: This bi-directional feature can only be viewed in Home Assistant, not in the Tuya App.
7.4. Data Reporting Interval
You can adjust how frequently the device reports data. On the device settings page in the app, click "More Data" to set the "Interval for Data Reporting" (range 5-3600 seconds).
Image 7.5: App settings for adjusting data reporting frequency and viewing detailed L1 and L2 electricity data.
8. Maintenance
- Keep the device clean and free from dust. Use a dry, soft cloth for cleaning.
- Regularly check wiring connections for tightness and signs of wear or damage.
- Ensure the device is not exposed to extreme temperatures or humidity, as it is rated IP20.
- Periodically check for firmware updates through your Zigbee hub or Home Assistant integration for improved performance and features.
9. Troubleshooting
- Device Not Powering On:
- Verify that the voltage input wires (L1, L2, N) are correctly connected and receiving power.
- Ensure the circuit breaker supplying power to the device is ON.
- Unable to Pair with Zigbee Network:
- Ensure your Zigbee hub/dongle is in pairing mode and within range.
- Press and hold the reset button on the monitor until the Status LED flashes to re-enter pairing mode.
- Check for interference from other wireless devices.
- Incorrect Readings or No Data:
- Verify that the CTs are correctly installed around the live wires and that the arrows indicate the correct direction of current flow.
- Ensure the CT wires are securely connected to the monitor's terminals with correct polarity (red to '+' and black to '-').
- Check the data reporting interval in the app settings; a longer interval means less frequent updates.
- Unreliable Connections (Voltage/CT Wires):
- Ensure wires are stripped to the correct length and fully inserted into the pluggable terminals.
- If using crimp-type terminals, ensure they are properly crimped and fit snugly into the pluggable connectors.
- App Not Displaying Bi-Directional Data:
- Bi-directional measurement data is primarily available through Home Assistant integration, not directly in the Tuya App.
10. Warranty and Support
Blindsmart products are designed for reliability and performance. For specific warranty details, please refer to the product packaging or the official Blindsmart website. For technical support, troubleshooting assistance, or inquiries, please contact Blindsmart customer service through their official channels.