TA X3 Solax
The TA X3 Solax is the official three-phase current transformer (CT) kit for Solax X3-Hybrid G4 inverters. It includes 3 CT CTSA016 (100A/33.33 mA), one for each phase, to enable export control and zero feed-in to the grid on residential and commercial three-phase photovoltaic systems. Clamp installation, no circuit interruption required.
The TA X3 Solax is the official Solax current transformer (CT) kit for X3 series three-phase inverters (X3-Hybrid G4). It includes 3 CTs to be installed on the three phases at the grid connection point, allowing the inverter to measure current flows on each phase and enabling export control and zero grid feed-in.
Why is the TA X3 needed on every Solax three-phase system with X3-Hybrid G4?
On a three-phase inverter, without grid current measurement, the inverter produces power without knowing how much the load is consuming. The TA X3 (1 set = 3 CTs) instantly detects the current on each of the three phases at the connection point and transmits the data to the X3-Hybrid G4 inverter. The inverter dynamically adjusts its output power to keep the flow to the grid below the configured limit. The response is fast and continuous, managing loads that vary within 0.3 seconds.
TA X3 Solax Technical Specifications
| Model | TA X3 Solax — CTSA016-100A/33.33mA |
| Kit contents | 1 set = 3 CT pieces |
| Type | Clamp-on current transformer (CT) |
| Compatibility | Solax X3-Hybrid G4 (three-phase) |
| Grid type | Three-phase |
| CT ratio | 100A / 33.33 mA |
| Inverter connection | Dedicated CT port on X3 inverter |
| Weight | 0.1 kg (kit) |
| Main function | Export control / zero grid feed-in on 3 phases |
CT X3 vs Smart Meter DTSU666: which to choose?
For the X3-Hybrid G4 inverter, there are two solutions for export control: the CT kit TA X3 and the three-phase smart meter DTSU666-D or DTSU666-CT. The CT kit is the simplest and most direct solution: it clamps onto the phases, requires no additional power supply, and no Modbus configuration. The smart meter, on the other hand, offers complete bidirectional measurement on all phases, an LCD display, detailed energy data, and RS485 protocol for advanced monitoring. For standard residential installations, the CT X3 is frequently the default choice; for commercial systems or where detailed energy traceability is required, the meter is preferable.
What is included in the supply?
- Kit of 3 current transformers CT (CTSA016 — 100A/33.33 mA)
- Connection cable to the CT port of the X3-Hybrid G4 inverter
Frequently Asked Questions
How many CTs are included in the TA X3 Solax kit?
The TA X3 Solax is sold as a complete kit with 3 current transformers (1 set = 3 pieces, model CTSA016-100A/33.33mA), one for each phase of the three-phase network. There is no need to purchase CTs separately: the kit is complete for installation on an X3-Hybrid G4 inverter.
Is the TA X3 compatible with all Solax three-phase inverters?
The TA X3 is specifically designed for the X3-Hybrid G4 inverter. For other Solax three-phase inverters (e.g., X3-MIC, X3-PRO) that do not have a dedicated CT port, you need to use the three-phase smart meter DTSU666-D or DTSU666-CT. For Solax X1-Hybrid G4 single-phase inverters, the single CT TA X1 Solax is used.
How is the TA X3 installed on a three-phase system?
The three CTs of the TA X3 are clamped onto the phase conductors L1, L2, L3 at the grid connection point (between the ENEL meter and the main panel), orienting the direction arrow towards the load. The CT cables are connected to the CT port of the X3-Hybrid G4 inverter following the manual instructions. Installation does not require cutting the conductors and must be carried out by a qualified electrician.
Does the TA X3 enable zero grid feed-in on all three phases?
Yes. With the TA X3 installed and correctly configured, the X3-Hybrid G4 inverter monitors the current on all three phases simultaneously. Through the inverter's Export Control function, you can set the desired export limit (including 0 W), and the inverter will adjust its power to comply with it on each phase.
Can I use the TA X3 together with the DTSU666-D smart meter on the same X3 inverter?
For the export control function on a single X3-Hybrid G4 inverter, you generally use either the CT kit or the smart meter, not both at the same time on the same measurement ports. In systems with a hybrid inverter + third-party string inverter, a configuration with two separate meters may be required; in this case, refer to the Solax manual and system documentation. Always consult a certified Solax installer for the optimal configuration.
