How do I enable Modbus on my Fronius GEN24?

How do I enable Modbus on my Fronius GEN24?

Enabling all the required Modbus settings on your Fronius GEN24 can only be done with a Technician's account.

You can enable Modbus with your Customer Password, but you will not be able to set the required Control Priorities unless you have the Technician password. 


Customer Instructions

You can contact your installer to arrange your Modbus settings configuration. Alternatively, you can raise a support ticket with us,  we will coordinate the settings configuration with Fronius.

You will need:
  1. Inverter(s) Model and Serial Number,
  2. Customer Password to log into your Inverter interface
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If you don't know your customer password, we can help you reset it once we've received your Serial Number and raised a case with Fronius in Step 1 below.

1. Submit a ticket with us and wait for confirmation

Send us a ticket with your Model and Serial Number of each GEN24 inverter you have. We will raise a case with Fronius who will unlock the 'Remote Access' option for you. We'll let you know when the Remote Access option has been unlocked for you.

2. Connect to your inverter's interface and log in as 'Customer'

You'll need to know how to log in to your inverter's interface: How-To Video: Connecting to the Fronius GEN24/Tauro user interface
If you don't know your customer password, let us know and we can help you reset it.
  1. Open the WLAN access point of the inverter. 
  2. Connect to the inverter on your smart device. The password is 12345678.
  3. Switch to the browser and open the user interface of the inverter with IP address 192.168.250.181
  4. Open the menu on the left and click ‘system’


You can then log in with your customer password.

3. Enable 'Remote Access' and 'Support User'

You can access instructions on how to enable remote access here, once Fronius have unlocked it: GEN24 and Tauro: Activation of remote access for Fronius Technical Support

Switch to ‘support’ in the left hand menu. 




Activate the remote access and the support user and then click on ‘save’.




Once you've done this, let us know and Fronius will modify your Modbus settings as required for LinkZB/LinkPro control.


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If you have multiple inverters, make sure you enable 'Remote Access' and 'Support User' for each inverter.


Technician/Installer instructions

Below is the set of instructions for setting up Modbus on Fronius Gen24 if you are accessing with a 'Technician's' account.
Fronius does NOT recommend providing end-users with Technician passwords. Fronius will complete the Modbus settings changes for customers by using remote access (above) if the customer does not have the Technician Password. 

1. Connect to the Inverter Interface and log in as 'Technician'.

Log into the Technician's account and make sure you can view the menu items 'Communication' and 'Safety and Grid Regulations' on the left hand side. These will be used in the following steps to get to the appropriate settings page.



2. In the 'Communication' tab, enable Modbus

Set up Modbus TCP comms by going to the Communications → Modbus page, and set fields as below.
  1. 'Control via Modbus TCP' turned 'ON'
  2. 'SunSpec Model Type' is set to 'float'
  3. 'Allow Control' is set to 'ON'



3. In the 'Safety and Grid Regulations ' Tab, set Control Priorities

Set Controlling Priorities by going to 'Safety and Grid Regulations' and applying priorities with Modbus Control first.


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Make sure you apply these settings for each Fronius GEN24 Inverter on-site.


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