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Huawei DTSU666-H 250A/50mA — is a new-generation three-phase electricity meter (Smart Power Sensor) designed for high-precision measurement of AC consumption and generation in solar power systems. The device provides Class 1 accuracy, is equipped with a convenient LCD display for local monitoring, and supports communication via RS-485 (Modbus RTU). It is used in Huawei Smart PV systems for energy monitoring, building “Zero Export” systems, and optimizing power distribution.
Key advantages of the Huawei DTSU666-H 250A energy meter
- Measures parameters in 3P3W or 3P4W three-phase networks with a load of up to 250 A per phase.
- Supports Class 1 measurement accuracy (±1% for power and energy, ±0.5% for voltage).
- Features an LCD display with easy setup and quick on-site parameter verification.
- Operates via an RS-485 interface with Modbus RTU protocol — compatible with SmartLogger, Huawei SUN2000 inverters, and the FusionSolar system.
- Consumes less than 1 W — extremely energy-efficient.
- Comes complete with three 250A/50mA current transformers (CTs), 5 meters long.
- Ideal for building power flow control systems in ESS or commercial solar power plants.
Technical Specifications
- Power supply type: 3P4W / 3P3W (three-phase)
- Current measurement range: 0–250 A
- Voltage range: 304–499 V (line), 176–288 V (phase)
- Measurement accuracy: Voltage ±0.5%, power/energy ±1%, frequency ±0.01 Hz
- Power supply: From the measured network, 176–288 V AC
- Power consumption: ≤ 1 W
- Communication interface: RS-485 (Modbus RTU), 9600 baud
- Mounting: 35 mm DIN rail
- Dimensions (H × W × D): 100 × 72 × 65.5 mm
- Weight: 1.5 kg (with cables)
- Operating temperature: -25°C to +60°C
- Humidity: 5–95% non-condensing
Use Cases
- Monitoring of energy consumption and generation in three-phase systems.
- Power measurement between the grid, inverter, and load.
- Implementation of the “Zero Export” function (limiting energy export to the grid).
- Visualization of energy flow in the Huawei FusionSolar system.
- Industrial and commercial facilities, private solar power plants, ESS systems.
Communication and monitoring interfaces
- RS-485 / Modbus RTU — standard communication protocol with Huawei SmartLogger or SUN2000 devices.
- LCD display — local configuration, viewing of power, current, voltage, frequency, and total energy.
- FusionSolar Cloud — real-time cloud monitoring, generation and consumption statistics.
Service support in Ukraine
Total-Energo LLC — Huawei’s partner in Ukraine. The company provides comprehensive solutions:
- Design of energy monitoring systems;
- Selection and supply of Huawei equipment;
- Installation and commissioning of DTSU666-H and SmartLogger;
- Warranty and post-warranty service;