Fronius is an Austrian maker of solar inverters, battery systems and the Wattpilot EV charger. Systems are monitored through Fronius Solar.web, set up with the Solar.start and Solar.wattpilot apps, and can be read by other software through open local interfaces.
Fronius is built around the inverter, or its Datamanager, on your local network. Fronius documents a Solar API that returns data as JSON and Modbus TCP with SunSpec data models for monitoring and control. Home Assistant reads the Solar API locally and rates the integration Platinum, and Modbus TCP is described there as the way to change inverter settings.
That suits people who want solar, battery and meter data inside Home Assistant, Homey or custom software without depending on the cloud. It is weaker for voice assistants and Matter, which we did not find on the pages we read, and the Wattpilot charger has fewer documented open interfaces than the inverters.
Connection
Local network; Solar API and Modbus TCP
Voice assistants
Not found
Matter
Not found
Open platforms
Home Assistant, Homey, Solar API and Modbus/SunSpec
What can be connected
Inverters GEN24, Tauro, Symo, Primo, Eco, Galvo, Agilo, Verto, IG Plus and Symo Hybrid, per Home Assistant
Storage and meters Batteries, Fronius Smart Meter and the Ohmpilot
EV charging Wattpilot charging stations, including the Wattpilot Flex
The monitoring app and web portal. The free app tracks PV generation, consumption and yield, with reports, notifications and a remote inverter update function, and can fully charge a battery from PV or the grid and hold it for 24 hours. A paid Premium tier is offered in selected countries. The web portal is aimed mainly at installers.
An installer app for commissioning GEN24, Reserva, Smart Meter, Ohmpilot and other Fronius devices, including software updates and direct access to each device's web interface. Fronius's page does not say how the app connects.
Sets up and controls Wattpilot chargers: charging modes such as Eco and Next Trip, charging current, load balancing and priorities, and a status dashboard. The App Store listing says the charger can be connected through its access point or over the internet. Published by Fronius International GmbH; iPhone needs iOS 15.1 or later.
Official supported by the brandCommunity built by someone elseNot found searched, nothing foundUnconfirmed sources conflict or could not be opened
Platform
Status
What it means
Sources
Connection
Local network (Solar API)
Yes
Home Assistant reaches inverters with a Datamanager, or an external Datalogger Web, that provide the Solar API version 0 or 1, by host name or IP address. It recommends a static IP or DHCP lease. Fronius describes the Solar API as an open REST API that reads data from the inverter over the network. We could not confirm from these pages whether the inverter connects by Ethernet, Wi-Fi or both.
Fronius documents Modbus TCP, a network version of SunSpec Modbus, for the Datamanager 2.0, GEN24, Tauro and Symo, and Modbus RTU as the serial RS485 alternative. Register maps are offered for download. Home Assistant says Modbus TCP is optional and is the only way to change settings or read per-string data on Gen24.
The Wattpilot listing describes connecting through its access point or over the internet, and a community Homey app uses the local network. Pages we read do not give Wi-Fi bands or standards.
No SmartThings integration was found in the pages we read. We could not confirm either way.
Searched, no source
Fronius Solar.web
Official
Fronius's own cloud monitoring covers inverters, the Smart Meter and batteries. The Premium tier adds forecasts and flexible tariff support in selected countries, and the Energy Cost Assistant needs a GEN24 or Verto inverter.
A built-in Fronius integration, rated Platinum and maintained by the Home Assistant project, not Fronius. It uses local polling of the Solar API and covers inverters, Smart Meter or S0 meters, the Ohmpilot and storage. Gen24 firmware 1.14.1 or later needs the Solar API enabled in the inverter's web interface. The page does not mention Wattpilot.
Third-party apps. Fronius GEN24 (Local) by Pascal Nohl works locally without cloud, needs the Solar API enabled, and lists Homey Cloud, Pro and Self-Hosted Server with no Bridge mentioned. Fronius by Thomas Houssin covers inverter, Ohmpilot, power flow, Smart Meter and storage, and does not say whether it is local. Fronius Wattpilot by Remco_Bosshard is a hobby project that connects over the local network by WebSocket and is tagged for Homey Pro.
We found no Hue integration and did not search for one specifically.
Searched, no source
Fronius Solar API (JSON)
Official
Fronius lists the Solar API as an open REST API that returns values such as power, voltage and current as JSON from the inverter or Datamanager 2.0, including connected Smart Meter, Ohmpilot and String Control. Operating instructions for versions V0 and V1 and a compatibility document are offered as downloads.
Fronius supplies Modbus TCP and RTU documentation aimed at integrators, with SunSpec data models, register maps, state codes and events for the Datamanager 2.0, GEN24, Tauro and Symo.
Checked 11 November 2026 against the brand's own pages, app store listings and each project's own page. “Not found” means we searched and found nothing, not that it is impossible. Compatibility changes often. Spot an error? Tell us and we will fix it.
Common questions about Fronius
Does Fronius support Matter?
Unconfirmed. We found no Fronius page or product about Matter. We did not run a dedicated Matter search, so this is unconfirmed.
Does Fronius work with Alexa?
Unconfirmed. No Fronius page for Alexa was found. We could not confirm either way.
Does Fronius work with Google Home?
Unconfirmed. No Fronius page for Google Home was found. We could not confirm either way.
Does Fronius work with Apple Home (HomeKit)?
Unconfirmed. No Fronius page for Apple Home was found. We could not confirm either way.
Does Fronius work with Home Assistant?
Yes. A built-in Fronius integration, rated Platinum and maintained by the Home Assistant project, not Fronius. It uses local polling of the Solar API and covers inverters, Smart Meter or S0 meters, the Ohmpilot and storage. Gen24 firmware 1.14.1 or later needs the Solar API enabled in the inverter's web interface. The page does not mention Wattpilot.
Does Fronius work with SmartThings?
Unconfirmed. No SmartThings integration was found in the pages we read. We could not confirm either way.
Does Fronius work with Homey?
Yes, through a community-built integration. Third-party apps. Fronius GEN24 (Local) by Pascal Nohl works locally without cloud, needs the Solar API enabled, and lists Homey Cloud, Pro and Self-Hosted Server with no Bridge mentioned. Fronius by Thomas Houssin covers inverter, Ohmpilot, power flow, Smart Meter and storage, and does not say whether it is local. Fronius Wattpilot by Remco_Bosshard is a hobby project that connects over the local network by WebSocket and is tagged for Homey Pro.
Does Fronius work with Hubitat?
Unconfirmed. We did not search for a Hubitat driver and could not confirm one.
Answers come from the sourced table above. See how Fronius compares with all brands on the smart home brand statistics page.