Huawei DTSU666-H 100A – Three-Phase Smart Power Meter for Solar Power Systems

The Huawei DTSU666-H 100A Smart Power Sensor is a three-phase, DIN-rail-mounted grid power meter specifically designed for solar power systems and energy storage solutions. Its primary function is to accurately monitor the power measured at the connection point and to communicate data to the inverter, enabling feed-in control and optimized energy management.

The device plays a particularly important role in systems where export restrictions, zero export, or battery charging control are required.

Three-phase grid measurement for Huawei inverters

The DTSU666-H 100A is suitable for use in three-phase, four-wire (3P4W) systems and is compatible with 3 × 230/400 V grid environments. Its measurement range is 0–100 A, making it ideal for typical residential and small commercial connection points.

The device operates via a current transformer with Active Class 1 accuracy for energy measurement. This accuracy ensures that the inverter can regulate power output and energy storage operation based on real and stable data.

It is important to note that the measured values are intended for system control, not for official billing purposes.

Export Limitation and Energy Storage Control

The Huawei DTSU666-H 100A plays a key role in regulating grid feed-in. If the grid operator mandates feed-in restrictions, the Smart Power Sensor measures the power at the connection point in real time and transmits the data to the inverter via RS485 communication (Modbus-RTU).

In energy storage systems, battery charging and discharging are optimized based on the device’s data, enabling the system to maximize self-consumption and reduce grid consumption.

For which systems is the DTSU666-H 100A recommended?

The Huawei DTSU666-H 100A is the ideal choice for three-phase residential solar systems, projects requiring export restrictions, and any Huawei inverter system connected to an energy storage unit. It offers a suitable solution for connection points up to 100 A; for higher current ratings, the 250 A version is recommended.

SOLARKIT Reviews

The Huawei DTSU666-H 100A is a fundamental component of Huawei systems. Accurate grid measurement is essential for export limit control and battery optimization, making this device not just an accessory but a strategic component in a modern solar system.

It is easy to install, offers stable communication, and ensures reliable long-term operation. It is recommended for systems where precise grid control and energy management are top priorities.