Single Phase Inverter for Three Phase Grid

Version: V1.3 Language: English Date: 2026/5/28

This solution explains how to connect a SolaX single-phase inverter to a three-phase grid using a supported three-phase meter to achieve export control in Total Mode.

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Revision History	About	Connection Diagram	Connection
Settings	Compatibility	Notes

Revision History

Update time	Update details	Version	Writer
2024.11.11	Update details	V1.1	Amara
2026.5.27	Add SolaX meter	V1.3	Evan-蒋振豪

About

Generally, a single-phase inverter can realize zero injection to the grid only with a single-phase meter. However, in some cases, users want to install a single-phase inverter in a three-phase system. With a single-phase meter, the inverter can only realize one phase's export control, which is not suitable for a three-phase system.

SolaX single-phase inverters support connecting a SolaX three-phase meter or Chint three-phase meter to realize three phases export control (Total Mode). Total zero export control can work in such a case.

Key point

Use a supported three-phase meter when a single-phase inverter is installed in a three-phase system and total export control is required.

Connection Diagram

Connection

There are no special requirements for this connection. Just follow the installation instructions for each part, and the meter should be a SolaX or Chint three-phase meter.

The AC output of the inverter could be connected to any phase. A three-phase meter should be installed before the grid to give export control to the whole three-phase system. The connection of the three-phase meter is the same as in a normal three-phase system. Connect the signal cable to the Meter/CT port of the inverter.

For practical on-site system installation and implementation of export limitation (zero-export control), it is generally recommended to connect the single-phase inverter between the L3 phase and neutral (N) of the three-phase utility grid, as illustrated in the diagram above.

For single-phase loads, the load may be connected to any phase (L1, L2, or L3). For three-phase loads, the loads can be connected to the three-phase grid as shown in the diagram above.

Important limitation

Provided that the total load power is equal to or smaller than the inverter output power, the inverter can achieve total zero-export control (Total Mode). However, it cannot provide per phase zero-export control (Per Phase), and therefore may not comply with the grid-code requirements of all regions.

Settings

Set export control to 0 if it is required.

Setting Path

Settings → Advanced settings → Export Control

Via Screen

Via APP

Step 1

Step 2

Step 3

If multiple single-phase string inverters are combined into a parallel system, such as the X1-Boost-G4, X1-Mini-G4, or X1-Smart-G2, and these inverters are connected to the same phase line, this KB solution can also be applied.

In this case, the export control setting changes to:

Parallel Setting → Single Phase → System Limit

For details, please refer to the corresponding inverter user manual.

Please note that three or more single-phase string inverters can be used to form a three-phase grid. For detailed configuration requirements, please refer to the corresponding inverter user manual.

Compatibility

Inverter	3P SolaX Meter	3P Chint Meter
X1-Mini-G4	M3-40	DTSU666 / DTSU666-CT
X1-Boost-G4	M3-40	DTSU666 / DTSU666-CT
X1-Smart-G2	M3-40	DTSU666 / DTSU666-CT
X1-IES	M3-40	DTSU666 / DTSU666-CT
X1-Fit-G4	M3-40 / M3-40 dual	DTSU666 / DTSU666-CT
X1-Hybrid-G4	M3-40 / M3-40 dual	DTSU666 / DTSU666-CT
X1-Vast	M3-40 / M3-40 dual	DTSU666 / DTSU666-CT

Notes

Only the compatibility information for single-phase inverters matched with three-phase meters is shown.
If the SolaX M3-40 dual meter is installed at this time, we recommend connecting only one CT.

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