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Project design

    SolaX ESS Adapter Box G2 Solution


    An Adapter Box G2 is a heat pump controller. It communicates with SolaX inverters via RS485 to control a heat pump via the dry contact or the analogue output. Users can control the Adapter Box G2 to utilise the inverter's surplus solar energy and battery storage capacity.


    A heat pump can only be connected to one Adapter Box G2.


    Adapter Box G2

    Figure 1: Solax Heat Pump Solution Diagram

    Figure 1: Solax Adapter Box G2



    1. Remote control and setting

    • Wi-Fi network connection
    • Control Heat Pump input


    2. Dual-control Mode

    • Digital output, 16 signals supported
    • Analog output, Max. 15 steps setting


    3. Various Heat Pump

    • SG Ready Heat Pump
    • Dry Contact Heat Pump
    • Analog Control Heat Pump


    4. Solar Efficiency

    • Optimize solar efficiency with Inverter (RS485 connect)


    5. Schedule Setting

    • Customize schedule to control

    Figure 2: Adapter Box G2 Dimensions


    Table 1: Adapter Box G2 Data Sheet

    Figure 3: Adapter Box G2 Ports Diagram


    Table 2: Name and Functions of Ports

    Name of ports

    Functions of ports

    Dry contact(DO)

    4 channel dry contact

    Analogue output (AO)

    0-10 Vdc analogue output


    Pin 4 and Pin 5 are for RS485 communication with the inverter.

    Pin 3 and Pin 6 are for 11-15 Vdc power supply input to Adapter Box G2.


    A split connection for EV chargers etc.(Pin 4 and Pin 5)

    Power adapter

    External 9-14 Vdc power supply


    Pin 3 and pin 6 of the RS485_INV connection and a power adapter can both supply the Adapter Box G2 with power, and the user can select one of them to supply the Adapter Box G2 with power.


    Adapter Box G1 VS Adapter Box G2

    Figure 4: Adapter Box G1 (left) and G2 (right)

    Adapter Box G1, it has:

    • Dry contact communication between the adapter box G1 and the inverter
    • One control mode: SG Ready control
    • No Wi-Fi.
    • The setting is made manually on the inverter, no APP control.

    Adapter Box G2, it has:

    • RS485 communication with the inverter.
    • Three control modes: Control via analogue output, control via dry contact, control via SG Ready. Compatible with most heat pumps.
    • Integrated Wi-Fi module.
    • Monitor your account to manage remote control and monitoring from the APP.



    1. Adapter Box G2 + hybrid inverter

    Compatible hybrid inverter model:

    • X1-Hybrid-G4, X3-Ultra, X3-Hybrid-G4, X1/X3-IES

    Figure 5: Adapter Box G2 + hybrid inverter diagram

    • Activate Modbus communication with the Adapter Box G2.
    • The baud rate should be 9600.


    2. Adapter Box G2 + on-grid inverter

    Compatible on-grid inverter model:

    X3-PRO G2, X3-MIC G2, X1-SMART G2, X1-Mini G4, X1-BOOST G4

    Figure 6: Adapter Box G2 + on-grid inverter diagram


    3.Adapter Box G2 + EV charger

    Method 1: Connect the EV Charger to 485 port on the Adapter Box G2.

    Method 2: Use a RJ45 splitter to connect the Adapter Box G2 and EV Charger together

    Figure 7: Adapter Box G2 + EV charger solution diagram





    Figure 8: Adapter Box G2 Connection Diagram

    1) Inverter connection port

    4&5 pin is for inverter communication. 3&6 pin is for 12V power supply from inverter

    2) Other device connection port

    4&5 pin is for communication with other device like EV charger etc.

    3) Auxiliary power supply input

    Used if the inverter could not provide power

    4) DO output port

    Connection for SG ready and dry contact heat pump

    5) AO output port

    Connection for analog control heat pump

    Figure 9: Actual Picture of Adapter Box G2 Ports

    Inverter to Adapter Box G2


    Figure 10: Inverter to Adapter Box G2 Connection Diagram


    Adapter Box G2 to Heat Pump

    Figure 11: Adapter Box G2 to Heat Pump Connection Diagram

    Figure 12: Adapter Box G2 Control Type


    Dry Contact

    Figure 13: Connection and Step Setting for Dry Contact Control Type



    On this mode the DO1, DO2, DO3 and DO4 all can work, each DO has on/off status, so that the four DO interface can represent 8 mode of heat pump work power . Here we can use the setting to run the heat pump under different Rate. CATE 6 has a better performance than CATE 5.Meanwhile their max transmission distance is 100 meters. If the distance is above 100 meters, can use CATE 7.


    SG Ready

    Figure 14: Connection and Step Setting for SG Ready Control Type


    On this mode, only DO1 work (default setting), DO1 has on/off status.


    Analog Output

    Figure 15: Connection and Step Setting for Analog Output Control Type


    Adapter Box AO(0~10v) connect to heat pump AI interface. Step 6 has a better performance than Step 5. Meanwhile, the maximum transmission distance is 100 meters. If the distance is above 100 meters, use Step 7.


    Adapter Box G2 Software Support

    Adapter Box G2 APP Registration

    • The Adapter Box G2 can be controlled via the" SolaX Cloud" APP.
    • Please follow the Wi-Fi installation guide to register a monitor account and create a website.
    • Add the serial number of the Adapter Box G2 under the site.

    Figure 16: APP registration

    • If you already have a monitoring account, log in with the account and go to the "Device" page in the app.
    • Tap the "+" icon in the upper right corner and enter the information to add the Adapter Box G2.

    Figure 17: Add Devices


    Adapter Box G2 Monitoring Interface

    Step 1. Click "Device" at the bottom of the user interface. Select "Adapter Box" from the drop-down list in the upper left corner to open the monitoring interface.

    Step 2. Select the user's online device. You can see the status, the analog output and the current step of the dry contact.

    Figure 18: Monitoring Instruction


    Adapter Box G2 Interface Setting

    Click on "Device" at the bottom of the interface. Select "Adapter Box" from the drop-down list in the upper left corner to open the monitoring interface.

    Figure 19: Interface Setting

    Select" Automatic" and you can control the heat pump according to the schedule.


    Adapter Box G2 Dry Contact Control

    • Maximum of 15 step, you can change the step as required.
    • Set the speed of each step according to the speed of the heat pump.
    • The "fallback step" is required if communication with the inverter is interrupted.
    • The "load capacity" is the rated capacity of the heat pump.
    • Set effective time periods on the "Schedule" settings page to activate the adapter box settings.

    Figure 20: Dry Contact Control


    Adapter Box G2 Analogue Output Control

    • Maximum 15 steps.
    • Each step means a different analog output voltage level. The corresponding power depends on the configuration of the heat pump.
    • The step changes depending on the excess feed-in power.
    • The interval between the individual steps is approximately 10 s.
    • The analog output level increases or decreases in sequence, the steps cannot be skipped.
    • Example: The nominal output of the heat pump is 2000W (load capacity = 2000W), there are 7 step, the current step is the switch-off step. With a PV power surplus of 1000W (corresponds to step 4: 50%), an analog signal is output from switch-off step to step 4 to 50%, the interval time is 10s, so it takes about 40s to reach the corresponding step.

    Figure 21: Analogue Output Control


    Adapter Box G2 SG Ready Control

    • In "SG Ready" mode, the dry contact only control the standard relay DO1. The relay is closed when the" Signal ON" condition is met and the relay is open when the" Signal OFF" condition is met.
    • In automatic mode, select" Automatic", click" Settings" to select" SG Ready" and set the following parameters.

    Figure 22: Mode and Parameter Setting

    Select" And"/" Or" in different situations in" Automatic" mode.

    Note: The switched off signal has priority if both the "Signal ON" condition and the "Signal OFF" condition are met.


    Table 3: Different Situations Setting Instruction


    Adapter Box G2 Schedule

    Step 1. Click "Schedule" in the settings interface to access the scheduling page. Then tap the "+" icon in the upper right corner to set new time periods.

    Step 2. Set new time periods.

    Figure 23: Adapter Box G2 Schedule Instruction

    • Activation" makes the schedule set by the user valid.
    • "Repeated_month", "Repeated_week", "Start time" and "End time" indicate the valid time periods.
    • The range of "Start time" and "End time" should be between 00:00 and 23:59 and the "End time" must be after the "Start time".
    • Click on "Save" when the user has made all the settings.
    • The user can set up to 6 time periods. The "Enable" switch (the "Activate" button) and the "Delete" symbol are used to adjust the schedules.

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