Fronius inverter
📋 Overview
The Fronius inverter is connected to the Currentt Navigator to read production data and control the system.
⚙️ How does it work?
The Currentt Navigator communicates with the Fronius inverter via Modbus TCP over the local network (Ethernet). Fronius uses the SunSpec Modbus protocol — an industry standard for solar equipment. The Currentt Navigator reads production data, power levels and status information, and can control the inverter's power output.
🧰 Requirements
- Currentt Navigator (connected to the local network)
- Ethernet cable (RJ45, CAT5/Cat6)
- Laptop or smartphone (for accessing the inverter's web interface)
1️⃣ Step 1: Connect the inverter to the network
All Fronius GEN24 Plus inverters have a built-in Ethernet port (RJ45) and WiFi.
- Connect an Ethernet cable (RJ45) to the Ethernet port on the Fronius inverter
- Connect the other end to your network switch or router
- The inverter automatically obtains an IP address via DHCP
2️⃣ Step 2: Determine the IP address
To configure the inverter, you need its IP address.
- Via your router: Check the DHCP client list for a device with "Fronius" in the name
- Via the Fronius WiFi AP: When the inverter is not connected via Ethernet, it broadcasts its own WiFi network (SSID: FRONIUS_[serial_number]). Connect to it and navigate to 192.168.250.1
3️⃣ Step 3: Enable Modbus TCP
Modbus TCP is disabled by default on Fronius inverters and must be enabled via the web interface.
- Open a browser and navigate to http://[IP address] of the inverter
- Log in as Technician:
| Role | Password |
|---|---|
| Customer | (limited access) |
| Technician | (set during commissioning — often the last 8 characters of the serial number) |
- Navigate to Communication > Modbus
- Set the following values:
| Setting | Value |
|---|---|
| Modbus TCP | Enabled |
| Port | 502 |
| Modbus address | 1 (default) |
| SunSpec Model | Float (recommended) |
- Save the settings
The Technician password is set during commissioning by the installer. Contact the installer if the password is unknown.
Fronius offers two SunSpec data models: Float (model 111-113) and Int (model 101-103). Choose Float for the easiest integration — this does not require scale factor calculations.
4️⃣ Step 4: Configuration in the Currentt Navigator
After enabling Modbus TCP, the inverter must be added in the Currentt Navigator.
Via the Setup Wizard (recommended)
- Click the settings icon (top right of the screen)
- Choose Setup Wizard
- Follow the on-screen steps
Manual configuration
- Click the settings icon (top right of the screen)
- Go to Components
- Click the + button in the Inverters section
- Select Fronius
- Enter the connection details:
| Parameter | Value |
|---|---|
| Connection | Modbus TCP |
| IP address | (IP address of the Fronius inverter) |
| Port | 502 |
| Modbus address | 1 (default) |
📋 Settings summary
| Parameter | Value |
|---|---|
| Connection | Ethernet (Modbus TCP) |
| Protocol | SunSpec Modbus TCP |
| IP address | (dynamic or static) |
| Port | 502 |
| Modbus address | 1 (default) |
| SunSpec Model | Float (recommended) |
🛟 Troubleshooting
| Problem | Possible cause | Solution |
|---|---|---|
| No connection | Modbus TCP not enabled | Enable Modbus TCP via the inverter's web interface |
| No connection | Wrong IP address | Check the IP address via the router or web interface |
| No connection | Wrong port | Check that the port is set to 502 |
| No connection | Wrong Modbus address | Check that the Modbus address matches (default 1) |
| No connection | Devices on different network | Ensure the Navigator and the Fronius inverter are on the same (V)LAN |
| No connection after restart | IP address changed (DHCP) | Set a static IP address |
| Cannot access web interface | Unknown password | Contact the installer for the Technician password |
| Incomplete battery data | Outdated firmware | Update the firmware to version 1.14.x or higher via the web interface |
✅ Compatible devices
Single-phase hybrid inverters (Primo GEN24 Plus)
| Model | Power |
|---|---|
| Primo GEN24 Plus 3.0 | 3 kW |
| Primo GEN24 Plus 3.6 | 3.6 kW |
| Primo GEN24 Plus 4.0 | 4 kW |
| Primo GEN24 Plus 4.6 | 4.6 kW |
| Primo GEN24 Plus 5.0 | 5 kW |
| Primo GEN24 Plus 6.0 | 6 kW |
Three-phase hybrid inverters (Symo GEN24 Plus)
| Model | Power |
|---|---|
| Symo GEN24 Plus 3.0 | 3 kW |
| Symo GEN24 Plus 4.0 | 4 kW |
| Symo GEN24 Plus 5.0 | 5 kW |
| Symo GEN24 Plus 6.0 | 6 kW |
| Symo GEN24 Plus 8.0 | 8 kW |
| Symo GEN24 Plus 10.0 | 10 kW |