Huawei DTSU666-H 250A – Three-Phase Smart Power Meter for Solar Power Systems

The Huawei DTSU666-H 250A Smart Power Sensor is a three-phase, DIN-rail-mounted grid power meter specifically designed for solar power systems and energy storage solutions, for larger connection points (up to 250 A).

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 250A can be used on both three-phase 3P4W and 3P3W grids and is suitable for 3 × 230/400 V grid environments. Its measurement range is 0–250 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 250A 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, the device’s data is used to optimize battery charging and discharging, enabling the system to maximize self-consumption and reduce grid consumption.

For which systems is the DTSU666-H 250A recommended?

The Huawei DTSU666-H 250A 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. The Huawei DTSU666-H 250A is the ideal choice for three-phase solar systems at sites where the connection point current is higher and export limitation or energy storage control is required. It provides sufficient measurement headroom up to a 250 A connection point; for smaller connection points (typically up to 100 A), the 100 A version may also be suitable.

SOLARKIT reviews

The Huawei DTSU666-H 250A is a key component of higher-capacity three-phase systems, where accurate connection point measurement is essential for export limits and battery optimization. It is particularly recommended for projects with high connection current and where stable, reliable RS485 communication is required.

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 primary considerations.