How do I enable Modbus TCP on my SMA inverter?

How do I enable Modbus TCP on my SMA inverter?

Preparation Checklist

  1. A smart device with WiFi capability such as Smartphone, Tablet or Laptop 
  2. In the following instructions, we assume the inverter has already been commissioned
  3. Make sure you have the inverter's serial number and WPA2-PSK password readily accessible. The serial number and WPA2-PSK password can typically be located on the inverter label and in the accompanying documentation. These details are crucial for establishing a connection to the inverter's WiFi hotspot and accessing its WebUI. 
See the example below of a serial number and WPA2-PSK password on an inverter label. 


Step 1: Connect to the inverter via WiFi or Ethernet using your laptop, smartphone or tablet. 

Option 1: Connect via WiFi
To identify and link up with the inverter, you need to utilise your device's WiFi connection. The inverter's WiFi network will be labeled similarly to SMA19xxxxxxx. In case there are multiple inverters nearby, ensure you connect to the WiFi network whose name matches the serial number of the intended inverter. 


Option B: Connect via Ethernet. 


Step 2: Log in to the Inverter Interface.
After successfully connecting to the inverter through WiFi or the ethernet cable, open your internet browser and enter the respective defualt IP address into the address bas as shown in the imaes below. 
IP address for WiFi connections 192.168.12.3

For direct connections via ethernet, enter the IP address 169.254.12.3



By doing so, you will gain access to the inverter's web user interface. From there you will be prompted to log in as either an "Installer" or "User" using either the modified or default password. Please note that if the User account has not been accessed before, you will be asked to set a password. Please follow the instructions below. 

You should now see the SMA login page. 



Now that you have successfully logged in, you can enable Modbus. 














If you select "Edit Parameters" but are unable to change the settings from NO to YES, please contact your original inverter installer. Your inverter settings may be locked by SMA Grid Guard and can only be changed by your original installer in that case. 
You also need to check your 'Grid connection point' settings are correct.

Scroll through to find 'System and device control' and locate 'Grid connection point'. You will see a field named 'Operating mode of active power limitation'. This field needs to be changed from 'Off' to 'External'. See the screenshot below:



Once you have made these changes make sure you "Save All".






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