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SAJ

Supported Devices​

Device TypeModbus TCP (Ethernet)RS485Curtailment
SAJ H2 series-5k-30k✅✅✅
SAJ HS2 series-5k-10k
SAJ CHS2
SAJ AS2❌

Configuration​

1: Physical Connection Setup​

For Ethernet Connection:​

  1. Locate the communication interface on your SAJ inverter
  2. Connect an ethernet cable between the inverter and your local network
  3. Follow the ethernet wiring guidelines for proper installation

For RS485 Connection:​

  1. Locate the RS485 port on your SAJ inverter
  2. Connect the RS485 cable according to the following pinout:
    • PIN A: RS485+
    • PIN B: RS485-
    • GND: Ground (if available)

2: Network Configuration​

  1. By default, the inverter is set to obtain an IP address automatically via DHCP
  2. If using a static IP configuration:
    • Access the inverter's web interface
    • Navigate to Network Settings
    • Configure the IP address, subnet mask, and gateway as needed

3: Communication Settings​

For optimal performance, ensure the following communication parameters:

  • Modbus TCP port: 502 (default)
  • RS485 baud rate: 9600
  • Data bits: 8
  • Stop bits: 1
  • Parity: None

Wiring​

Ethernet Connection​

RS485 Connection​

  • Use shielded twisted pair cable
  • Maximum cable length: 1000 meters
  • Connect the shield to ground at one end only
  • Maintain proper RS485 bus topology

eSAJ Home settings​

StepImage
Open ESAJ Home and connect to the inverter
Select SAJ in battery settings and click Save after the changeimage1
Click initialization and select grid for the countryimage2
Disable Export limitation (if it is enabled power from the inverter cannot be fed into the grid).image3

Troubleshooting​

Common issues and solutions:

  1. No Communication

    • Check physical connections
    • Verify network settings
    • Ensure proper Modbus address configuration

  2. Intermittent Connection

    • Check cable quality and connections
    • Verify there's no electromagnetic interference
    • Ensure proper cable routing