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Project design

    Solax Solar ESS EV Charging Solution

    Solution Overview

    Solax offers the Solar ESS EV Charging solution to make it possible to achieve intelligent energy management and charge your vehicle with green energy (energy from PV). This system includes PV panels, hybrid inverter, batteries, EV charger (Home version) and some necessary accessories. The schematic diagram is shown as below.

    Solar ESS EV Charging System

    Key Features

    Intelligent charging modes

    Thanks to the communication between the charger and inverter, the system has Green/Eco mode to use full-green/Semi-green energy to charge your vehicle.

    In Green mode: The default level is 6A, in which the EV Charger will only start to charge if generating current reaches 6A, and it never take

    electricity from the grid. While there is another 3A level start to charge if generating current reaches 3A, capable to purchase other up to 3A from the grid. This work mode will spend all its effort to help clients use renewable energy and reduce the cost of buying electricity from the grid.


    In Eco mode:it helps users to charge at a minimum power rate (set by user). If there is surplus energy form PV, it can exceed the minimum power rate to make full use the energy. If the PV energy is not enough, it will take the electricity from the grid to charge at the minimum power rate. For example, the users set the charging current 16A. If the current from the inverter is only 10A then the rest would be taken from the grid as 6A. If the current from the inverter(PV) is 18A, then the Smart EV Charger will output 18A.

    Dynamic load balancing function

    This function will make sure that the total power of house will not exceed the main grid capacity when using EV charger. It is realized by adjusting the charger power output automatically according to the value of the main grid current.

    Communication Cable Connection

    The EV charger need communicate with inverter via RS485, not all the inverters support this function. The inverter supported list are as below:

    Energy Storage Inverter

    String Inverter

    Single phase

    Three phase

    Single phase

    Three phase

    X1-Hybrid G4



    X3-Hybrid G4




    X1-Mini G3/G4

    X1-Boost G3/G4

    X1-Smart G2

    X3-PRO G2

    X3-MIC G2

    Note: The inverter must connect a measuring device(meter/CT), otherwise the EV charger can't have the surplus PV information, the Green mode will not work properly.

    The COM ports of the EV charger

    As the diagram shown the pin4/5(RS485) are used to communicate with the inverters. Please note the pin 1/2/3/6/7/8 are used to connect CTs in standalone system. You don’t need use them if there is connection between EV

    charger and inverter.

    Home Edition



    EV Charger COM interface



    COM port of X1-Hybrid G4 & X3-Hybrid G4

    Connect the EV charger to the COM port of the inverter via cat5 cable directly. Both side are RJ45 port and cable assignment is matching with each other.


    Interface of COM of the hybrid G4 inverter



    COM port of X3-PRO G2

    Connect the pin4/5 of charger to the PIN 1/2 of the "RS485" port of the inverter. PIN 5/6 connect to the meter.

    Interface of COM of the X3-PRO G2 inverter


    COM port of X3-MIC G2, X1-Mini G3/G4 & X1-Boost G3/G4

    The RS485 port shares the same RJ45 port with Meter, so a splitter is needed to connect EV charger and meter to the inverter as the below diagram shown. Please not the splitter should be placed in a waterproof place.

    Note: For X1-Boost G3, the inverter which connected to EVC must to use Meter now.( The CT solution is under development)


    COM port of X1-IES & X3-IES

    Connect the pin 7&8 (P3) of inverter to the pin 4&5 of EV charger’s com port.

    COM port of X1-Smart G2

    Connect pin13/14&15/16 to pin4&5 of EV charger's com port.

    COM port of X3-Ultra

    Connect pin3&6 or pin4&5 to pin4&5 of EV charger's com port.


    Setting on EV-Charger


    • When the EV-Charger is powered on, follow the instructions in the user manual to download the APP, complete the Wi-Fi connection and login.
    • Select "Advanced Settings" and set the "Grid Data Source" as "Inverter" as shown below and touch "OK" to confirm. The buzzer of the EV-                Charger will beep after the setting is succeeded.(This step is no needed for fusion version





    • Set the Main Breaker limit as below if need enable the Dynamic load balancing function

    Settings on the Inverter


    • Comunication setting

    Go to Advanced -> Modbus set as below:

    CommFunSelect: EV charger Braud Rate: 9600

    EV Charger Address: 70


    • Battery charge EVC function

    (Only for Hybrid inverter)

    Go to Advanced -> Battery charge EVC.

    Enable means storage battery allow EV charger to use battery’s energy.

    Disable means storage battery doesn’t allow EV charger to use battery’s energy.


    All the operations described in this guide can only be performed by qualified electricians with a good knowledge of the characteristics and maintenance of the

    smart EV-Charger and the inverter. Any operations are prohibited before reading

    this guide and the relevant manual carefully. All the settings for the smart EV- Charger and the inverter need to refer to the corresponding manual strictly. SolaX Power will not be responsible for any damages or harms caused by improper setting.

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