SMA - Activate Modbus TCP

The following guide describes how to configure the Modbus TCP  settings for SMA inverters and how to test the connection.

Prerequisites​

Required Items​

  • WiFi-capable device (smartphone, tablet, or laptop)
  • Inverter serial number
  • WPA2-PSK  password (located on inverter label)
  • Installer  rights for certain settings

Configuration Process​

Initial Connection​

Choose one of these connection methods:


WiFi Connection​

  1. Find network named SMA19xxxxxxx
  2. Use IP address: 192.168.12.3

Ethernet Connection​

  1. Connect via ethernet cable
  2. Use IP address: 169.254.12.3

Settings Configuration​

  1. Open web browser
  2. Enter appropriate IP  address based on connection method
  3. Log in as Installer
  4. Navigate to Device Parameters
  5. Select Edit Parameters

Modbus Setup​

  1. Navigate to Modbus  settings
  2. Enable the Modbus feature
  3. Enable TCP server
  4. Leave the port as 502

Grid Connection Configuration​

For standard models:

  1. Go to System and device control
  2. Find Grid connection point
  3. Change Operating mode of active power limitation  to External

For SBx.x-1AV40/41  models:

  1. Locate Operating mode active power setting
  2. Set to External active power setpoint

Finalizing Changes​

  1. Always click Save All  after making modifications
  2. Wait for changes to be applied

Troubleshooting​

Modbus Setting Issues​

If unable to change Modbus settings:

  1. Contact your installer
  2. Check if settings are locked by SMA Grid Guard
  3. Verify installer  access rights

Connection Problems​

If experiencing connection issues:

  1. Verify correct WiFi network selection
  2. Double-check IP  address
  3. Ensure you're within range of the inverter

Missing Settings​

If settings are not visible:

  1. Verify your model number
  2. Check for alternative setting names
  3. Confirm installer  access level

Testing Connectivity (advanced)

After enabling Modbus TCP on your SMA inverter, you should verify that the connection is functioning correctly. You can follow our testing guide to confirm the connection. For SMA inverters, use the default Modbus port 502. The Unit ID is typically set to 3, which differs from many other manufacturers. Make sure you've completed all the grid connection configuration steps before testing, as these settings can affect Modbus communication.

Source​

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