ELAUSYS / INV-KNX-FR
Fronius KNX Gateway
The INV-KNX-FR connects compatible Fronius solar inverters to your KNX installation via Modbus TCP. Bring solar production data—and battery and grid measurements where supported—into your KNX visualisation and automation, using a local network connection without a cloud service.
The product
Designed for your installation.
Connect your Fronius inverter to KNX
The Elausys INV-KNX-FR makes inverter measurements available as KNX group objects. View solar production alongside other building information in HyperVisu or another KNX visualisation, and use the data in your energy-management logic.
The gateway communicates over the local network using its Ethernet connection. An internet connection or cloud service is not required for this communication.
Monitor production, battery storage, and grid exchange
Access solar power output, energy yield, and electrical measurements reported by your inverter.
On supported battery installations, monitor battery operating status and state of charge.
Grid import/export power is available from a compatible Fronius Smart Meter. Enable meter monitoring and configure the meter address in ETS.
The available data depends on the inverter model, firmware, selected communication profile, and installation.
Use energy data in KNX automation
The gateway includes 64 configurable logic functions, including logic gates, sequences, calendar triggers, and mathematical operations.
For example, use measured grid export to enable water heating through a suitable KNX actuator, or display battery charge level on a KNX visualisation. The connected equipment and configured logic determine how the installation responds.
Measurements update at a configurable interval of 1–255 minutes.
Compatibility and installation
Supported ranges include Fronius GEN24 / GEN24 Plus, Symo, Symo Hybrid, and Primo models with a supported Modbus TCP interface. Compatibility must be checked for the exact model and firmware.
Enable Modbus TCP in the GEN24 or Datamanager web interface and select the supported SunSpec int+SF model type. Select the matching inverter profile in ETS.
Installation requires a KNX bus connection, network access to the supported Modbus TCP interface, and an external 12–30 VDC power supply. KNX parameters are configured in ETS5 or ETS6; network settings are configured through the gateway’s web interface.
Check the documentation for the communication profile and firmware required by your installation.
Specifications
- Reference
- INV-KNX-FR
- Manufacturer
- ELAUSYS
| Parameter | Specification |
|---|---|
| Product reference | INV-KNX-FR |
| Supported inverter ranges | Fronius GEN24 / GEN24 Plus, Symo, Symo Hybrid, and Primo models with a supported Modbus TCP interface |
| Inverter connection | Modbus TCP over Ethernet, RJ45 |
| Communication profiles | SunSpec Modbus, int+SF model type |
| KNX measurements | Power, energy, voltage, current, frequency, and other available inverter measurements |
| PV monitoring | Voltage and current for up to 2 PV strings, where available |
| Battery monitoring | 1 battery: operating status and state of charge on supported installations |
| Grid monitoring | Import/export power from a compatible Fronius Smart Meter |
| Data polling interval | 1–255 minutes |
| Logic functions | 64 |
| AC network configuration | Single-phase or three-phase |
| External power supply | 12–30 VDC |
| KNX bus current | <16 mA at 29 VDC |
| Isolation | Galvanic isolation from the KNX bus |
| Mounting | DIN rail, 2-module width |
| Operating temperature | +5 to +45 °C |
| Configuration | ETS5 / ETS6; web interface for network settings |
Key features
- Connect compatible Fronius inverters to KNX over Ethernet
- Monitor solar power production and energy yield
- Access battery and grid import/export data on supported installations
- Use 64 built-in logic functions for KNX automation
- Communicate locally without a cloud service or internet connection
- Configure in ETS5 or ETS6
- Compact 2-module DIN-rail housing
Documents & support
PDFInverter Gateway DatasheetProduct document · Opens in a new tabPDFQuick-Start-GuideProduct document · Opens in a new tabPDFSafety-and-Regulatory-Notice-ENProduct document · Opens in a new tabBrowse product supportFAQ
Frequently Asked Questions
Which Fronius inverters are compatible?
Fronius GEN24 / GEN24 Plus, Symo, Symo Hybrid, and Primo models with a supported Modbus TCP interface. Check the documentation for your exact model, firmware, and communication interface before ordering.
Can I monitor a battery?
On supported battery installations, monitor battery operating status and state of charge. Availability depends on the inverter, firmware, and installation. These measurements can be used in KNX visualisation and logic.
Can I measure electricity imported from or exported to the grid?
Grid import/export power is available from a compatible Fronius Smart Meter. Enable meter monitoring and configure the meter address in ETS.
Can it switch appliances when surplus solar energy is available?
The gateway can provide measurements and KNX logic for energy-based automation. Switching or enabling an appliance requires a suitable KNX actuator or compatible control interface. Surplus-based operation also requires grid-exchange measurements and correctly configured logic.
Does it need an internet connection?
An internet connection or cloud service is not required for local communication with the supported Modbus TCP interface. The gateway and inverter system must remain reachable on the local network.
What do I need to install it?
A KNX installation, network connectivity to the supported Fronius Modbus TCP interface, an external 12–30 VDC power supply, and ETS5 or ETS6 for configuration. Enable Modbus TCP in the GEN24 or Datamanager web interface and select the supported SunSpec int+SF model type. Select the matching inverter profile in ETS.
What is required to read a Fronius Smart Meter?
The meter must be installed and configured within the Fronius system. Enable the power-meter option in ETS and set the meter’s Modbus address according to the installation documentation.