Introduction
As global demand for renewable energy grows, together with PV energy, wind power is becoming a key part of modern power systems.
Several European regions, including Poland, support wind power development through policies like subsidies for wind turbines to boost renewable energy and promote the energy transition.
Therefore, certain Solax inverters are designed to convert wind energy into usable electricity for household loads by integrating wind turbine capabilities.
Applicable Scope
This document will discuss the single-phase string inverter of the X1 MINI G4 series.
NOTE: Only the X1-MINI-3.0K-G4 and X1-MINI-3.3K-G4 inverters, i.e., with power ratings of 3.0 and 3.3 kW, can be used for operation with wind turbines (WT).
This manual applies only to these 2 dedicated models.
The following is a diagram of the X1-MINI-G4 external wind turbine solution.
In the X1-MINI-G4 inverter, the PV port (MPPT input) can be used to connect one wind turbine, but only through a controller equipped with protective circuits.
Warranty terms for the inverter when used with a wind turbine
To maintain the inverter warranty, the following rules must be strictly observed when integrating wind turbines or other energy sources:
1. Use Only Certified Controllers and Components:
Connect wind turbines only using Wind Turbine manufacturer-designated controllers equipped with appropriate automatic protection functions. Using incompatible devices may result in warranty loss.
2. Respect Electrical Limits:
Do not exceed the inverter’s maximum input voltage, current, and power ratings for PV inputs used with wind turbines. Overloading or improper configuration can cause damage not covered by warranty.
3. Proper Installation and Grounding:
Ensure all system components—including turbines, controllers, inverters, and resistive dump loads—are installed according to manufacturer guidelines and correctly grounded to avoid faults.
4. Use Appropriate Rectification:
Always convert the wind turbine’s AC output to DC before feeding the inverter’s PV inputs, using a suitable rectifier bridge as specified.
5. Follow Configuration Guidelines:
Set inverter input parameters (such as power curve VA points, voltage, and current limits) precisely as recommended in the product documentation.
6. Avoid Unauthorized Modifications:
Do not use any software other than the official Solax software, do not physically modify the inverter or its equipment, and use only accessories (e.g., plugs) provided with the inverter.
7. Perform Regular Maintenance and Monitoring:
Keep the system properly maintained and monitored for faults or abnormal operation to comply with warranty terms.
8. Comply with the following Technical Requirements as well as the general warranty conditions of Solax devices.
Technical Requirements
1: Wind Turbine Controller / Self-Breaker Requirement
Wind turbines must have a dedicated controller and/or self-breaker.
Once: a) the load power demand drops, the batteries are full, and grid export is not allowed,
or b) the inverter must shut down due to grid parameter faults or other reasons,
then the inverter will stop using wind turbine (WT) power. As a result, the WT speed and voltage may increase rapidly, which can be extremely dangerous.
Therefore, the wind turbine (WT) controller must have at least automatic protection capabilities to regulate the voltage and power produced by the WT by unloading excess energy to an emergency self-breaker, usually a resistive load. Such control functions ensure the safe connection of the wind turbine to the inverter.
2: DC Input Requirement on Inverter PV Ports
The inverter’s PV inputs accept only DC voltage and current.
Thus, the AC voltage generated by the wind turbine must first be converted to DC via an appropriate rectifier bridge before connecting to the inverter.
3: Electrical limitations for connecting a wind turbine to dedicated X1 MINI G4 models
When connecting a wind turbine to the PV input of the X1 MINI G4 3.0K and 3.3K inverters, the following limitations must be observed:
· Maximum DC voltage from WT: 500 V
· Maximum current from WT: 6 A
· Maximum power: 3 kW
· Minimum starting voltage: 50 V
· Minimum stop voltage: 40 V
4: PV Input Configurations for Wind Turbine Integration
The PV input can be enabled for use with one wind turbine. Then, a maximum of 12 VA (Volt-Amps) points must be set to allow processing of energy from the wind turbine
It should be noted that VA points vary between different types/powers/manufacturers of wind turbines and must be specified by the turbine manufacturer.
The table below is not real VA curve list, shows only the maximum reference current and power values at various voltages for the PV input used as the wind turbine input for dedicated X1-MINI-G4 models
|
Voltage (V) |
Max. Current (A) |
Max Power (W) |
|
150 |
6 |
900 |
|
170 |
6 |
1020 |
|
200 |
6 |
1200 |
|
250 |
6 |
1500 |
|
300 |
6 |
1800 |
|
350 |
6 |
2100 |
|
400 |
6 |
2400 |
|
450 |
6 |
2700 |
|
500 |
6 |
3000 |
5: Power Curve Last Point Setting (VA12)
The last point of the power curve (VA12) should be set to the maximum allowed input values:
· 500 V and 6 A for PV1
This setting is used as a blocking or breaking point for the wind turbine to protect the system.
6: Wind Turbine Controller Brake Resistor Activation Voltage
The wind turbine controller should start sending power to the brake resistor at a voltage max 10 V higher than the inverter’s maximum voltage.
If the controller starts working below the inverter’s maximum voltage, set the inverter’s maximum voltage and current limits 10 V lower than the controller’s start voltage.
Setting Wind Turbine function
Pre-Connection Setup Instructions
Before physically connecting the wind turbine to the inverter via the PV terminal, you must:
a) 
Ensure that the inverter is updated to software version DSP_V028 and ARM_V035 or higher (internal code: A:035
D:028 or higher). You can find the internal code by navigating to Menu → About → Internal Code.
b) For remote settings, the Solax communication module Pocket 3.0 series (or higher) must also be updated to the latest available firmware version.
c) complete the following setup — either manually through the LCD screen or remotely.
Note:
To perform the update and configure the wind turbine (WT) settings in the X1 MINI G4, the inverter must have:
· AC voltage from Grid
· Stable at least 50 V DC on the MPPT port
Therefore, during the update and configuration, it is required to provide a stable DC voltage source (e.g., from a DC power supply, PV simulator with appropriate parameters).
Guidelines for setting the VA curve
· The VA (Volt-Amper) curve defines the allowable relationships between voltage and current for individual operating points of the wind turbine connected to the inverter.
· Proper configuration of the VA curve helps protect the system and optimize energy production.
· The optimal VA curve is specified by the wind turbine manufacturer but should always be entered considering the permissible parameters of the inverter (see section 3 Technical Requirements).
Key rules for the VA curve in dedicated X1 MINI G4:
· Voltage point settings must increase progressively: V1 < V2 < V3 ... < V12
· The voltage range of each point should be within: 40 V – 500 V
· Current values (A1 ~ A12) can be set independently but should not exceed 6A.
· The last point of the curve (VA12) should be set to the maximum allowable input values according to the inverter’s limitations (voltage, current, and rated power, see section 3 Technical Requirements).
· It is recommended to set the initial points with low current to avoid excessively inhibiting the turbine at startup.
Sample VA points table for dedicated X1 MINI G4
|
VA Point |
Voltage [V] |
Current [A] |
|
VA1 |
40 |
0,1 |
|
VA2 |
60 |
0,3 |
|
... |
... |
... |
|
VA12 |
500 |
6 |
Additional Recommendations:
· Follow the wind turbine manufacturer's instructions regarding declared VA points.
· Configured values should match the actual parameters of the specific wind turbine model used.
· After saving the settings, it is recommended to verify them by monitoring the inverter operation.
MANUAL SETTINGS
1. General logic of settings:
Select Settings (installer code 2014 – caution: do not change this code) > Wind Turbine, > Mode Select and set to Enabled
b. Select VA Setting, where you can set the VA1~VA12 values .
2. LCD settings in inverter menu advanced settings:
Note: set the last point of the power curve (VA12) to the maximum allowed input values:
- 500 V and 6 A
This helps to safely break WT at highest parameters but still producing power.
Remote settings in advanced settings:
The Solax Cloud (V6.9.1 or higher) app also supports remote setup of WT.
For these settings, the inverter must be online, connected to the end-user account, and updated together with the communication module.
Remote settings are more convenient and recommended to use.
For these settings, the inverter must be online, connected to the end-user account, and updated together with the communication module.
Remote settings are more convenient and recommended to use.
Note: set the last point of the power curve (VA12) to the maximum allowed input values:
- 500 V and 6 A
This helps to safely breake WT at highest parameters but still producing power.
Final remarks:
Supported inverter models and software version for local and remote settings
|
Model |
Progress |
Software Version |
|
X3-Hybrid-G4 |
Done |
DSP_V1.53; ARM_V1.51 |
|
X1-MINI-G4 |
Done |
DSP_V028; ARM_V035 |
|
Solax Cloud |
Done |
V 6.9.1 |
|
Communication modules Pocket 3.0 (black housing) |
Done |
Upload latest software |
Safety Operation Notes
1. Before starting the installation, ensure that the wind turbine (WT) is powered off before making any connections.
2. Verify that the grounding of the wind turbine, controller, and inverter is fully secure and reliable.
Please note:
- information provided in this manual (V1.5.2 dated 02.12.2025) may change in the future.
- Please always use the latest available version of the manual.
Chuck Lee