Three-phase Smart Meter Huawei DTSU666-H
The DTSU666-H is Huawei's three-phase smart power sensor: it measures current, voltage, power and energy with class 1 accuracy, an LCD display, Modbus-RTU RS485 communication and DIN35 rail mounting. For monitoring production and consumption with SUN2000 inverters.
The DTSU666-H is a Huawei three-phase smart power sensor designed for photovoltaic systems: it measures voltage, current, power and energy with class 1 accuracy, mounts on a DIN35 rail and communicates via Modbus-RTU RS485, enabling energy monitoring for both production and consumption.
What is the three-phase smart meter for?
In three-phase systems, the smart meter measures in real time the energy exchanged on the three phases at the connection point. The inverter uses this data to manage self-consumption, storage and grid feed-in control (zero feed-in), adapting production to the user's actual consumption.
DTSU666-H technical specifications
| Manufacturer | Huawei |
| Model | DTSU666-H |
| Type | Three-phase smart power sensor |
| Accuracy class | 1 |
| Measured quantities | Current, voltage, power, energy |
| Display | Built-in LCD |
| Communication | RS485 Modbus-RTU |
| Mounting | DIN35 rail |
| Compatibility | Huawei SUN2000 inverters |
Frequently asked questions
Is it for three-phase or single-phase systems?
The DTSU666-H is dedicated to three-phase systems. For single-phase systems the DDSU666-H model is used.
What does class 1 accuracy mean?
Class 1 indicates a maximum measurement error of around 1% under nominal conditions: adequate for energy monitoring, self-consumption and grid feed-in management in photovoltaic systems.
Is it needed for zero grid feed-in?
Yes. By providing the inverter with the real-time measurement of three-phase energy at the grid point, it enables export control and zero feed-in functions, as well as self-consumption monitoring.
How is it installed?
It mounts on a DIN35 rail in the electrical panel and connects to the inverter via RS485. Installation must be carried out by a qualified electrician according to the Huawei diagram and applicable standards.
