1. Product Overview
The Growatt TPM-E Smart Meter DTSU666 is a high-precision three-phase energy meter designed for integration into photovoltaic (PV) systems, specifically compatible with Growatt MIN 6000TL-X inverters. This DIN rail mounted device measures various electrical parameters, providing essential data for system monitoring and management. It features an LCD display for local readings and RS485 communication for remote data acquisition. The meter itself is manufactured by CHNT.
Figure 1: Front view of the CHNT DTSU666 Three-Phase Smart Meter, showing LCD display and control buttons (SET, ESC, arrow).
2. Specifications
The following table details the technical specifications of the DTSU666 Smart Meter:
Figure 2: Detailed specifications table for the DTSU666 meter.
| Category | Parameter | Value |
|---|---|---|
| Measurement | Compliance | IEC62052-11 IEC62053-21 |
| Connection type | 3P4W | |
| Accuracy (active) | Class 1.0 | |
| Voltage | Nominal voltage (Un) | 3x220/380V, 3x57.7/100V |
| Operating range | 0.7Un ~ 1.2Un | |
| Power consumption | ≤1W, 5VA | |
| Current | CT | 1.5(6)A |
| Direct Connect (DC) | 5(80)A | |
| Frequency | Operating Frequency | 50Hz or 60Hz |
| LCD Display | Characters | 7 characters of 7 segment display |
| Digital size | 5.3mm × 2.8mm | |
| LED Display | Flashes | Number of flashes per kWh |
| Measured Values | Energy | Total kWh, Total kvarh |
| Power | Instantaneous kW, kvar | |
| Current | Instantaneous Irms | |
| Voltage | Instantaneous Vrms | |
| Other | Frequency, power factor | |
| Communications | Interface | RS485 |
| Protocol | Modbus and DL/T | |
| Environmental | Operating range limit | -40°C to +75°C |
| Storage range limit | -40°C to +85°C | |
| Relative humidity | ≤95%RH | |
| Ingress protection | IP54 | |
| Dimensions & Weight | Dimensions (L x W x H) | 98mm × 65mm × 72mm |
| Weight | 0.4 kg (Approx.) |
Figure 3: Dimensional drawing of the DTSU666 meter, showing front, side, and top views with measurements in millimeters.
3. Package Contents
Verify that all items are present and undamaged upon opening the package. If any items are missing or damaged, contact your supplier immediately.
- 1x Growatt TPM-E Smart Meter DTSU666 (CHNT DSSU666)
- 1x RS485 Communication Cable (length may vary)
- 1x Quick Start Guide / Basic Documentation (typical inclusion)
Figure 4: Typical package contents, including the DTSU666 meter and a coiled communication cable.
4. Safety Information
WARNING: Electrical shock hazard. Installation and maintenance should only be performed by qualified personnel.
- Always disconnect power before installing or servicing the meter.
- Ensure all wiring complies with local and national electrical codes.
- Do not operate the meter if it appears damaged.
- Keep the meter away from moisture and extreme temperatures outside its specified operating range.
- Ensure proper grounding for all connected equipment.
5. Installation and Setup
5.1 Mounting
The DTSU666 is designed for DIN rail mounting. Securely attach the meter to a standard 35mm DIN rail within an electrical enclosure. Ensure adequate ventilation around the meter.
Figure 5: Side view of the DTSU666 meter, illustrating the DIN rail mounting mechanism.
5.2 Wiring Connections
Carefully follow the wiring diagram below for connecting the meter to the grid, load, and inverter. Pay close attention to the input (L-in, N-in) and output (L-out, N-out) terminals, as well as the RS485 communication lines.
Figure 6: Wiring diagram for connecting the CHNT DTSU666 meter to an inverter, grid, and load, along with a table detailing meter pin connections.
Terminal Descriptions:
- L-in (Pin 1): Grid Live input.
- L-out (Pin 2): AC connector & Load Live output.
- N-in (Pin 3): Grid Neutral input.
- N-out (Pin 4): AC connector & Load Neutral output.
- RS485A (Pin 7): RS485 communication line A (connect to SYS COM Pin 7 RS485A2 on inverter).
- RS485B (Pin 8): RS485 communication line B (connect to SYS COM Pin 8 RS485B2 on inverter).
Note: For the Australian market, installers may connect pin 3 or pin 4 to the neutral links/bars as per local regulations.
Figure 7: Top view of the DTSU666 meter, showing the input terminals (L-in, L-out, N-in, N-out) and RS485 communication terminals.
Figure 8: Bottom view of the DTSU666 meter, showing the main power terminals.
6. Operation
Once properly installed and powered, the DTSU666 meter will automatically begin measuring electrical parameters. The LCD display provides real-time readings of various values such as total kWh, instantaneous power, voltage, current, and frequency.
6.1 Display Navigation
Use the buttons on the front panel to navigate through the display menus:
- SET button: Typically used to enter menu settings or confirm selections.
- ESC button: Used to exit a menu or cancel an action.
- Arrow button (right): Used to scroll through different display parameters or menu options.
Refer to the detailed operational guide provided by Growatt for specific menu structures and parameter configurations, especially for integration with Growatt inverters.
7. Maintenance
The DTSU666 Smart Meter is designed for reliable, long-term operation with minimal maintenance. However, periodic checks are recommended:
- Cleaning: Gently wipe the meter's exterior with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Connection Check: Periodically inspect all wiring connections to ensure they are secure and free from corrosion.
- Environmental Conditions: Ensure the operating environment remains within the specified temperature and humidity limits.
- Firmware Updates: If applicable, consult Growatt's support resources for information on firmware updates for improved performance or new features.
8. Troubleshooting
If you encounter issues with your DTSU666 Smart Meter, consider the following troubleshooting steps:
- No Display/Power:
- Check if the main power supply to the meter is active.
- Verify all power wiring connections (L-in, N-in) are correct and secure.
- Ensure the circuit breaker or fuse protecting the meter is not tripped or blown.
- Incorrect Readings:
- Confirm that the current transformers (CTs) are correctly installed and oriented (if applicable for your model/setup).
- Verify that the voltage and current wiring matches the system configuration (e.g., 3-phase, 4-wire).
- Check for any loose connections that might affect measurement accuracy.
- Communication Issues (RS485):
- Ensure the RS485 A and B lines are correctly connected between the meter and the inverter.
- Check for proper termination resistors on the RS485 bus if required by the system design.
- Verify communication settings (baud rate, parity, data bits, stop bits) on both the meter and the inverter.
- Meter Not Responding to Buttons:
- Try a soft reset by cycling power to the meter (turn off, wait 30 seconds, turn on).
- If the issue persists, contact technical support.
For further assistance, refer to the comprehensive Growatt inverter manual or contact Growatt technical support.
9. Warranty and Support
For warranty information, please refer to the warranty card included with your product or visit the official Growatt website. Keep your purchase receipt as proof of purchase.
For technical support, troubleshooting, or service inquiries, please contact your authorized Growatt dealer or Growatt customer service directly. Provide your product model number (DTSU666) and serial number when seeking support.
