Open interfaces

Flexible expansion of PV systems

Illustration Fronius GEN24 with interfaces

Connecting Energy - open interfaces for PV systems

An efficient energy supply means making use of synergies. As digitalization, automation, and global network technologies continue to expand, new ways of boosting efficiency in local energy systems are unlocked.

Fronius is a pioneer in harnessing the potential offered by synergies in the photovoltaic sector. We develop solutions for easily and intelligently connecting solar energy to third-party systems, allowing you to plan a unique setup tailored to your exact needs.

House with solar modules on roof in the sunshine

Maximum flexibility: Modbus, SunSpec, and APIs for smart home integration

From heat pumps to home automation systems, third-party components can be easily connected to Fronius products. The energy generated, including any PV surplus, is optimally distributed and used through intelligent energy management, thus increasing the rate of self-consumption and shortening the time until the PV system generates a profit.

The four digital energy management outputs, Modbus RTU/TCP (SunSpec) and Fronius Solar API (JSON) device interfaces, and the Solar.web Query API and Flexibility API cloud-to-cloud interfaces ensure maximum flexibility in your choice of components. Our systems can also be planned with individual components as a customized modular concept to meet specific needs.

Person sitting on a sofa in a modern living room using a tablet.
Highlights
Maximum flexibility
Open interfaces enable third-party components to be easily integrated into individual, modular systems.
Maximum self-consumption
Direct activation of loads when excess PV current is present to increase self-consumption rates
Financial advantage
Reduced grid consumption leads to a quicker ROI
Maximum flexibility
Open interfaces enable third-party components to be easily integrated into individual, modular systems.
Maximum self-consumption
Direct activation of loads when excess PV current is present to increase self-consumption rates
Financial advantage
Reduced grid consumption leads to a quicker ROI

Our interfaces at glance

Modbus TCP / RTU  Solar API  Solar.web Query API   Flexibility API 
  • Direct access to live performance data
    Monitor voltages, currents, AC and DC power, operating temperature, and status codes.
  • SunSpec-compliant
    Uniform data structure for easy integration into central building control, energy management, and industrial automation systems. 
  • Control commands in real time
    Set values for active power, reactive power, or battery behavior (charging or discharging). 
  • Meter point data in real time
    Consumption, import, and export data.
  • Power, consumption, and meter data in real time
    PV generation, domestic consumption, battery energy flows, and grid import
  • Easy integration into smart home systems
    Ideal for ioBroker, Home Assistant, Node‑RED, Loxone, and many more.
  • JSON data
    Easy to analyze for visualizations or automated workflows.
  • Data access without local connection or additional hardware
    Perfect for proprietary platforms, apps, or services.
  • Comprehensive device data
    Information about the inverter, battery, meter, system configuration.
  • Historical & aggregated data
    Power values at yearly, monthly, daily, or 5-minute intervals.
  • Power flow data & real-time information
    Generation, consumption, battery, grid import.
  • Set export limit at the grid connection point
    Set a fixed upper export limit in relation to local household consumption
  • Set PV and battery generation limits
    Limit PV generation and battery power as a percentage of inverter rated power
  • Intelligent battery management
    Set the charging/discharging power and adjustable minimum & maximum rates to optimize battery usage
  • Schedules
    Time-based, automatically expiring control commands for optimizing energy flow and grid services.

 

More about open interfaces

Find the right Fronius partner for you

Icon installer
Find an installer
Are you considering a photovoltaic system powered by Fronius? From planning to installation and commissioning: you’ll find the right partner for your project here.
To Fronius installers
Icon cooperation network
Find a sales partner
Are you an installer looking for a sales partner in your area? Then we would be happy to help.
To Fronius sales partners