Before you start

Before you begin, make sure:

The inverter is physically installed and powered on
The inverter is updated to the latest software version

Step-by-Step Instructions

1. Connect the inverter to the network

Connect an Ethernet cable to the LAN1 port on the inverter
Verify the connection is established by checking the inverter display

For network infrastructure requirements and troubleshooting, see Infrastructure requirements for the gateway.

2. Access the inverter settings

Touch the sensor in the middle of the inverter to activate the access point
Scan the QR code on the inverter to connect
Log in as installer

3. Enable communication via Modbus

Navigate to
Communication → Modbus
Configure the following Modbus settings:
- Modbus Server via TCP: Activated
- Modbus port: 502
- SunSpec Model Type: int + SF
- Meter address: 240
- Allow control: activated
- Restrict control: deactivated
Save the Modbus settings

4. Set control priorities

Navigate to:
Safety and network requirements → I/O power management
Configure the following control priorities
- Modbus control as priority 1
Save the settings

5. Discover the inverter in the commissioning wizard

The inverter is now ready for the commissioning wizard. The gateway will scan the network to find available devices, which may take a few minutes. Once complete, the Fronius Symo GEN24 inverter will appear on the results page.

When the inverter is detected, in most cases set the asset type to Hybrid (PV and Battery) from the dropdown.

If you are using the inverter exclusively as a PV inverter, select PV System. If it is used solely as a battery inverter, choose Battery.

Country-specific configurations

Germany

Applies to PV installations exceeding 2 kWp installed after February 24, 2025.

For detailed information refer to §9 EEG (2025) – 60% feed-in limitation

The inverter controls the grid feed-in limit, supporting energy management optimization. The following inverter configuration is mandatory:

Navigate to
Safety and grid regulations → Export limitation
Configure the following Export Limit settings:
- Power Control: Total Power Limit
- Export Limit Control (Soft Limit): 60% of Maximum grid feed-in power in W
- Export Limit Protection (Hard Limit Trip): 60% of Maximum grid feed-in power in W
Save the settings

Set the following Energy management setting in the commissioning wizard:

Allow optimisation: Yes
Grid feed-in limit controlled by inverter: Yes

FAQ

Why isn't the inverter appearing in the commissioning wizard?

Check that the inverter is connected via Ethernet at LAN1 (not WiFi) and that Modbus is enabled with Modbus control set to priority 1. Restart the gateway and wait for the network scan to complete.

How do I update the firmware of the inverter?

You can perform the update through the Fronius Solar.web app or the web app. For detailed update instructions, refer to the official Fronius documentation.