I’m happy to announce the public release of Fronius GEN24 (Local) for Homey Pro.
This app connects to your Fronius inverter locally via LAN or WIFI (no cloud) and exposes live power values and energy counters to Homey, including Energy Dashboard integration.
Scope / compatibility note: This app was developed specifically for my own PV setup (GEN24 inverter, Fronius Reserva battery, and Fronius Smart Meter IP). It will likely work with other Fronius configurations as well, but there is no guarantee. Since I don’t have access to other systems for testing, I can’t promise future compatibility across all setups — however, I’ll do my best to keep it as broadly compatible and stable as possible.
What it does (local Fronius Solar API)
The app reads data from the inverter’s local Solar API endpoints (e.g. PowerFlow, Meter, Storage, Common Inverter Data) and updates Homey devices via one centralized polling engine.
Devices included
Solar (PV production + inverter details, supports multiple inverters via Device ID)
Grid (import/export live power + imported/exported energy counters)
Battery (SoC, power, voltage, temperature + charged/discharged counters)
Flow (custom “power flow” overview values for your own tiles/flows)
Energy Dashboard
Grid and Battery are integrated into Homey’s Energy Dashboard.
For Grid, the app reports import/export energy counters so “Today / Yesterday” etc. works correctly.
If your power sign direction (import vs export) looks inverted, there are invert sign settings per device (Grid/Battery/Flow). Note: Flow device settings only affect the Flow device display; Grid/Battery affect the Energy Dashboard live flow (and Battery counters).
Setup
Ensure the Fronius Solar API is enabled on the inverter (local web interface).
If the API is disabled, the app cannot retrieve data.
Install the app.
In app settings, enter the local IP address of your inverter.
Add the device(s) you want (Solar / Grid / Battery / Flow).
Support (this thread)
This thread is also the official support thread. If you need help, please include:
Homey model + firmware (Homey Pro 2026)
App version
Which devices you added (Solar/Grid/Battery/Flow)
A short description + screenshot of the Energy Dashboard (if relevant)
A snippet of the app logs around the issue
If a test version is available, you can install it by opening the app’s Update history (or “Version history”) page and pressing the Test button.
I’ll keep improving stability and compatibility, but I’ll also try to bundle changes to avoid unnecessary review cycles.
Thanks to everyone testing and reporting issues — it helped a lot to harden the Energy Dashboard reporting and overall reliability.
The latest version is 1.0.7 but certification is still pending. You can download it by clicking on the update history and then clicking on the test button to the right of version 1.0.7
Thank you for your excellent work and congratulations on the official release of Fronius Gen24 (Local)!
I have been able to test the app over the last few days and it runs superbly, delivering the relevant values via a local connection, i.e. without having to go via the cloud! Thanks to the latest update, grid values are now also available in the Energy Dashboard.
I will continue testing it over the next few days and report back!
I’m currently working on version 1.1.0. Planned features include:
A new Statistics device with monthly KPIs for the current month, last month, and two months ago
Monthly values for load, PV, grid import/export, autarky, self-consumption, and data coverage
Estimated savings above the Luxembourg reference power threshold
A Luxembourg reference power setting (kW), applied from the start of the next month **
Efficient local data aggregation with RAM-based polling, 15-minute persistence, and 90-day daily retention
App settings tools to reset statistics data
CSV export of daily statistics
Full statistics backup export as JSON
Experimental support for multiple inverters
** In Luxembourg, the electricity tariff model includes more than just the cost of the imported energy itself. Since January 1, 2025, low-voltage network tariffs include a fixed charge based on a reference power category, a volumetric network charge applied to all imported electricity, and an additional surcharge applied to the share imported above the reference power threshold. The model continues to apply in the 2026 tariff tables.
In practice, households are assigned to reference classes such as 3 kW, 7 kW or 12 kW. The higher the class, the higher the fixed network charge. Exceeding the threshold is allowed, but imported electricity above that threshold is charged with an additional surcharge, and sustained high peaks can affect which reference category best matches the household profile over time.
This has a direct impact on profitability calculations. Example: if household load is 6 kW and PV production is 2 kW, the net grid import is 4 kW. If the household is in the 3 kW reference class, those 2 kW of PV do not only avoid normal energy costs. They also avoid the surcharge that would otherwise apply above the reference threshold. That is why this feature was developed mainly for Luxembourg, although parts of it may also be useful elsewhere for general self-consumption and grid-dependency analysis. The app’s calculation here is intended as an estimate for monitoring purposes, not as an official billing calculation.
