TA X1 Solax
The TA X1 Solax is the official current transformer (CT) for the single-phase inverter Solax X1-Hybrid G4. It is clamp-mounted on the mains phase and allows the inverter to detect energy flows in order to activate export control and zero grid feed-in. A simple and quick-to-install solution, it is an alternative to the smart meter for residential systems.
The TA X1 Solax is the official current transformer (CT – Current Transformer) from Solax for X1 series single-phase inverters (X1-Hybrid G4). Installed on the grid line, it allows the inverter to instantly measure current flows and enables key functions such as export limitation and smart self-consumption management, without the need for an external smart meter.
CT vs Smart Meter: When should you use the TA X1?
For Solax X1 systems, there are two solutions for export control: the current transformer (CT/TA) and the smart meter DDSU666-D. The CT is the simplest and most economical solution: it clamps onto the grid phase, does not require circuit interruption, and does not need its own power supply. The smart meter, on the other hand, offers complete bidirectional measurements with a display and Modbus protocol, and is preferable when you also want detailed monitoring of electrical parameters. In many residential installations, the CT is the standard choice to enable export control with maximum simplicity.
TA X1 Solax Technical Specifications
| Model | TA X1 Solax (single-phase CT) |
| Type | Clamp-on current transformer (CT) |
| Compatibility | Solax X1-Hybrid G4 (single-phase) |
| Grid type | Single-phase |
| CT Ratio | 100A / 33.33 mA |
| Inverter connection | Dedicated CT port on X1 inverter |
| Weight | 0.1 kg |
| Main function | Export control / zero feed-in to the grid |
How does the TA X1 work in the Solax system?
The TA X1 is clamped onto the phase cable at the grid connection point. It detects the current flowing at that point and transmits the signal to the X1-Hybrid G4 inverter via the CT communication cable. The inverter interprets the data and continuously adjusts its output power to keep the energy flow to the grid below the set limit (typically 0 W for zero feed-in). The response is fast — loads that vary within 0.3 seconds are effectively managed.
What is included in the supply?
- 1 TA X1 Solax current transformer (CT)
- Connection cable to the CT port of the X1 inverter
Frequently Asked Questions
What is the difference between the TA X1 and the DDSU666-D smart meter for Solax?
The TA X1 is a current transformer that clamps onto the phase and only detects current, transmitting it directly to the CT port of the inverter. It is the simplest solution and does not require its own power supply or RS485 configuration. The DDSU666-D smart meter is a complete bidirectional meter (voltage, current, power, energy) with LCD display and Modbus RS485 protocol. Both enable export control; the meter offers more data and functions, while the CT offers simplicity and lower cost.
Is the TA X1 Solax compatible with the X1-Hybrid G4 inverter?
Yes. The TA X1 is the official Solax CT for the X1-Hybrid G4 (single-phase) inverter. It connects to the dedicated CT port on the inverter. For three-phase X3 series inverters, you need the TA X3 Solax kit, which includes 3 CTs for the three phases.
Is the TA X1 sufficient to set zero feed-in to the grid?
Yes. With the TA X1 correctly installed on the grid phase, you can access the Export Control menu of the X1-Hybrid G4 inverter and set the export value to 0 W. The inverter will continuously monitor the grid current via the CT and adjust its power to avoid feeding energy into the grid.
How do you install the TA X1 on the system?
The TA X1 is clamped onto the phase conductor at the grid connection point (between the ENEL meter and the main panel), with the direction arrow pointing towards the load. The CT cable is then connected to the CT port of the X1-Hybrid G4 inverter following the manual instructions. Installation does not require cutting the conductor. The operation must be carried out by a qualified electrician.
Can I use the TA X1 together with the DDSU666-D smart meter on the same inverter?
In general, for a single X1-Hybrid G4 inverter, you use either the CT or the smart meter, not both at the same time on the same measurement port. The RS485 smart meter and the CT use different communication ports on the inverter; check the specific inverter manual to verify the supported configuration for your scenario (e.g., presence of third-party string inverters).
