Fronius

Name: PV-Inverter Fronius Factory-PID: PV-Inverter.Fronius .Implemented Natures/Interfaces

ManagedSymmetricPvInverter - Managed (controllable) PV inverter ElectricityMeter - Power measurement interface ModbusComponent - Modbus protocol integration OpenemsComponent - OpenEMS component lifecycle

Description:

Integration for Fronius solar PV inverters. Monitors real-time solar generation power and allows active power limitation to reduce feed-in to the grid. Communicates via Modbus using industry-standard SunSpec register map for interoperability. .Configuration:

id (String): Unique component identifier; default: "pvInverter0" alias (String): Human-readable name; default: same as id enabled (Boolean): Enable/disable this component; default: true readOnly (Boolean): Read-only mode (no power limitation commands sent); default: true modbus_id (String): ID of Modbus bridge; default: "modbus0" modbusUnitId (Integer): Modbus Unit-ID of the inverter; default: 1

Name: Meter Fronius Factory-PID: Meter.Fronius .Implemented Natures/Interfaces

ElectricityMeter - Three-phase power meter interface ModbusComponent - Modbus protocol integration OpenemsComponent - OpenEMS component lifecycle ModbusSlave - Modbus slave functionality

Description:

Integration for Fronius Smart Meter devices. Measures three-phase AC power and energy values (production, consumption, active/reactive power) via Modbus. Commonly used to measure grid power when Fronius inverters are present in the installation. .Configuration:

id (String): Unique component identifier; default: "meter0" alias (String): Human-readable name; default: same as id enabled (Boolean): Enable/disable this component; default: true type (MeterType): Meter role (GRID, PRODUCTION, CONSUMPTION); default: GRID modbus_id (String): ID of Modbus bridge; default: "modbus0" modbusUnitId (Integer): Modbus Unit-ID of the meter; default: 240 invert (Boolean): Invert power values and swap directions; default: false

Name: ESS Fronius Gen24 Hybrid Factory-PID: Ess.Fronius.Gen24.Inverter .Implemented Natures/Interfaces

HybridManagedSymmetricBatteryInverter - Hybrid battery inverter with PV tracking ManagedSymmetricBatteryInverter - Managed battery inverter interface SymmetricBatteryInverter - Symmetric battery inverter interface ManagedSymmetricPvInverter - Managed PV inverter interface ModbusComponent - Modbus protocol integration OpenemsComponent - OpenEMS component lifecycle

Description:

Integration for the Fronius Symo Gen24 hybrid inverter. Controls battery charge and discharge via SunSpec registers, monitors DC power from PV strings, and supports active power limitation via SunSpec Model 123. The Modbus server must be configured to use int+SF register format. .Configuration:

id (String): Unique component identifier; default: "batteryInverter0" alias (String): Human-readable name; default: same as id enabled (Boolean): Enable/disable this component; default: true modbus_id (String): ID of Modbus bridge; default: "modbus0" modbusUnitId (Integer): Modbus Unit-ID of the inverter; default: 1 controlMode (ControlMode): INTERNAL = Fronius manages autonomously, REMOTE = OpenEMS controls charge/discharge; default: INTERNAL

Name: ESS Fronius Gen24 Battery Factory-PID: Ess.Fronius.Gen24.Battery .Implemented Natures/Interfaces

Battery - Battery interface (SoC, voltage, current, limits) StartStoppable - Start/stop lifecycle OpenemsComponent - OpenEMS component lifecycle

Description:

Reads battery state data directly from the Fronius Gen24 inverter via Modbus. Provides state of charge, voltage, current and charge/discharge limits to the OpenEMS energy management system. A battery preset can be selected to automatically configure voltage limits based on the number of installed modules. .Configuration:

id (String): Unique component identifier; default: "battery0" alias (String): Human-readable name; default: same as id enabled (Boolean): Enable/disable this component; default: true modbus_id (String): ID of Modbus bridge; default: "modbus0" modbusUnitId (Integer): Modbus Unit-ID. Must match the Battery Inverter’s Unit-ID, since both talk to the same physical device; default: 1 batteryPreset (BatteryPreset): Predefined battery model for automatic voltage limits; default: CUSTOM numberOfModules (Integer): Number of installed battery modules; default: 4 chargeMaxVoltage (Integer): Maximum charge voltage in V — only used when preset is CUSTOM; default: 480 dischargeMinVoltage (Integer): Minimum discharge voltage in V — only used when preset is CUSTOM; default: 320

BYD HVS — 2 to 5 modules, 102.4 V nominal per module BYD HVM — 3 to 8 modules, 51.2 V nominal per module Fronius Reserva — 2 to 5 modules Fronius Reserva Pro — 3 to 8 modules LG Battery Flex — 2 to 4 modules CUSTOM — manual voltage configuration

Name: ESS Fronius Gen24 DC Charger PV Factory-PID: Ess.Fronius.Gen24.DcCharger .Implemented Natures/Interfaces

EssDcCharger - DC charger interface (actual power, voltage, current) TimedataProvider - Energy logging OpenemsComponent - OpenEMS component lifecycle

Description:

Exposes one PV string of the Fronius Gen24 inverter as an OpenEMS DC charger component. This component performs its own independent SunSpec discovery via Modbus against the same physical Gen24 device the Battery Inverter reads — there is no OSGi reference between the two. Supports PV string ONE and TWO. .Configuration:

id (String): Unique component identifier; default: "charger0" alias (String): Human-readable name; default: same as id enabled (Boolean): Enable/disable this component; default: true modbus_id (String): ID of Modbus bridge. Must point at the same physical Fronius Gen24 device as the Battery Inverter’s Modbus configuration; default: "modbus0" modbusUnitId (Integer): Modbus Unit-ID. Must match the Battery Inverter’s Unit-ID, since both talk to the same physical device; default: 1 pvString (PvString): PV string to use (ONE or TWO); default: ONE

The Fronius Smart Meter must be configured to use SunSpec Model Type float (not integer). This is a critical setting:

Access Fronius Smart Meter web interface Navigate to Settings → Communication Set SunSpec Model Type to "float" (not "integer") Save and restart meter if necessary

Without this configuration, the OpenEMS integration will not read correct values. === Gen24 Modbus Server Configuration The Fronius Gen24 inverter must be configured to use int+SF register format in its Modbus server:

Access the Fronius Gen24 web interface Navigate to Communication → Modbus Enable Modbus TCP server Set register format to int+SF (not float)

The three Gen24 components (Battery Inverter, Battery, DC Charger) each connect directly to Modbus and perform their own independent SunSpec discovery against the same physical Fronius Gen24 device — there is no OSGi reference between them.

Make sure modbus_id and modbusUnitId are configured identically (same physical device, same Unit-ID) across all Gen24 components you use, since they all talk to the same inverter independently. === Read-Only Mode vs Managed Mode PV Inverter has two operating modes:

Read-Only Mode (readOnly: true): Only monitors solar generation, no commands sent to inverter Managed Mode (readOnly: false): Allows OpenEMS controllers to limit active power output

Start with read-only mode for testing, then enable managed mode if power limitation is needed. Source Code icon:github