SMA

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

Find network named SMA19xxxxxxx
Use IP address: 192.168.12.3

Ethernet Connection

Connect via ethernet cable
Use IP address: 169.254.12.3

Settings Configuration

Open web browser
Enter appropriate IP address based on connection method
Log in as Installer
Navigate to Device Parameters
Select Edit Parameters

Modbus Setup

Navigate to Modbus settings
Enable the Modbus feature
Enable TCP server
Leave the port as 502

Grid Connection Configuration

For standard models:

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

For SBx.x-1AV40/41 models:

Locate Operating mode active power setting
Set to External active power setpoint

Finalizing Changes

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

Troubleshooting

Modbus Setting Issues

If unable to change Modbus settings:

Contact your installer
Check if settings are locked by SMA Grid Guard
Verify installer access rights

Connection Problems

If experiencing connection issues:

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

Missing Settings

If settings are not visible:

Verify your model number
Check for alternative setting names
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.