Fronius: Solar inverters, site meters and documented local data interfaces

Fronius supplies solar inverters, energy meters and monitoring equipment, with local SunSpec Modbus interfaces documented for specific product generations.

Summary

Best for
PV installations needing documented local inverter and site-meter data with a defined system configuration.
Less suited to
Assuming every meter uses the inverter's network interface or that different SunSpec model formats share addresses.
Deployment
Inverter with appropriate site meter and supported monitoring hardware or built-in communications.
Data in
Inverter readings and connected-meter information through generation-specific SunSpec and other documented interfaces.

Overview

Fronius makes solar inverters and the metering and communication equipment used around them. The company history also covers its welding and charging businesses, so the solar portfolio is one part of a wider technology manufacturer. For energy monitoring, the important distinction is between an inverter's own production readings and a separate meter measuring flows at the building connection.

The Smart Meter TS 65A-3 provides that physical measurement. GEN24 communications and Datamanager 2.0 provide documented routes for accessing inverter and connected-meter information. These layers can be combined, but their wiring, configuration and data representations should be understood separately when planning a collection system.

Offering

The Smart Meter TS 65A-3 manual describes a three-phase direct-connected instrument with a maximum current of 65 A. This is a different selection from a meter requiring external current transformers. The manual also covers its position in the installation and its serial connection to compatible Fronius equipment.

For inverter data, GEN24 has its own communications documentation. Datamanager 2.0 is a separately documented monitoring generation with its own configuration interface. Comparing these by product generation helps identify which setup screens, connected-meter behaviour and data models apply, instead of assuming that a guide for one Fronius communications product describes every installation.

Products and platforms

  1. GEN24 Modbus interface

    Inverter communications

    Local Modbus TCP/RTU interface with selectable SunSpec representations and connected-meter models.4

  2. Argeno 125

    Commercial PV inverter

    Commercial inverter with ten MPP trackers and a published 125 kVA maximum AC output.12

  3. Energy Cost Assistant

    Energy management software

    Solar.web Premium function optimising storage strategy using generation, consumption and prices; compatible system and country availability apply.11

  4. Selectiva 4.0

    Industrial battery charger

    Charger series for lead-acid traction batteries, using the Ri charging process.6

  5. Charge & Connect

    Charging software

    Cloud software for visibility, notifications and analysis across a charging infrastructure.6

  6. GEN24 and GEN24 Plus

    Residential PV inverters

    Residential solar inverter families; battery functions depend on the selected variant and configuration.7

  7. Verto and Verto Plus

    PV inverters

    Families serving larger residential, agricultural and small-business installations.7

  8. Tauro

    Commercial PV inverter

    Inverter family for large commercial solar installations.7

  9. Reserva and Reserva Pro

    Battery storage

    Fronius storage families for supported hybrid inverter combinations, with different capacity ranges.10

  10. Wattpilot Flex and Wattpilot Go

    EV charging

    Stationary and mobile EV charging products with supported solar-surplus charging arrangements.8

  11. Solar.web

    PV monitoring software

    PV production and consumption monitoring, with free and premium offerings.9

  12. Solar.wattpilot

    EV charging application

    Application for setting and managing supported Wattpilot charging.9

  13. Solar.creator and Solar.start

    Installer software

    PV planning and inverter commissioning applications within the Fronius software offering.9

Technology

The GEN24 Modbus manual distinguishes floating-point SunSpec meter models from integer values with scale factors. It explicitly notes that the register positions differ between representations. It also describes how a meter connected through Modbus RTU can be read through the inverter's Modbus TCP interface using the corresponding meter model.

Meter location affects interpretation. The same manual distinguishes grid connection, load, external generator and sub-load positions, with different meanings for power signs and energy counters. A useful integration therefore records the location and selected model format as well as the value. The Datamanager instructions provide the corresponding configuration guidance for that product generation.

Integrations and interoperability

  1. Supported BYD PV batteries

    The official storage page names selected BYD systems as compatible; exact inverter/battery pairing must follow its compatibility list.10

  2. Supported LG PV batteries

    The official storage page names selected LG systems as compatible; this is not blanket compatibility with every LG battery.10

Markets

A site monitoring project can use inverter data to understand generation and a separate Smart Meter to distinguish grid exchange from building demand. This is particularly useful when evaluating self-consumption or the effect of controllable loads. The metering position determines what the reading represents, so a production counter and a grid-import counter answer different operational questions.

The GEN24 documentation includes both measurement models and separately configured control functions. Those should be evaluated as different tasks: collecting a reading needs a correct decoder and interpretation, while changing inverter behaviour requires the appropriate configuration and system design. This profile describes the documented interfaces without presenting a universal external-control entitlement.

Company

Fronius dates its founding to 1945, when Günter Fronius established the business in Pettenbach. Its current history describes continuing family ownership, and the international locations page identifies Fronius International GmbH's headquarters in Pettenbach, Austria. The same page lists national subsidiaries separately, which avoids confusing a regional office with the group's headquarters.

The documentation is unusually useful for evaluating local data access because Fronius publishes complete browser-readable manuals for GEN24 Modbus, Datamanager and the TS 65A-3 meter. Those sources expose model choices and installation roles directly, providing a stronger starting point for an implementation than a broad statement that an inverter supports Modbus.

Alternatives in renewable energy equipment

What to look for in renewable energy equipment

References

  1. Fronius history and family ownership (opens in a new tab)
  2. Fronius international sites and headquarters (opens in a new tab)
  3. Smart Meter TS 65A-3 operating instructions (opens in a new tab)
  4. GEN24 Modbus TCP and RTU instructions (opens in a new tab)
  5. Datamanager 2.0 operating instructions (opens in a new tab)
  6. fronius official product evidence source-101 (opens in a new tab)
  7. fronius official product evidence source-102 (opens in a new tab)
  8. fronius official product evidence source-104 (opens in a new tab)
  9. fronius official product evidence source-106 (opens in a new tab)
  10. fronius official product evidence source-107 (opens in a new tab)
  11. fronius official product evidence source-108 (opens in a new tab)
  12. fronius official product evidence source-109 (opens in a new tab)

This profile does not imply a commercial relationship with Fronius and may contain inaccuracies.