Victron Fronius Integration: Modbus TCP Setup

Key Takeaways

• Grid-tied power regulation: The Fronius Zero feed-in feature - which is part of an Energy Storage System ESS - works on all supported models except the IG Plus.
• Active Venus OS power throttling: It is possible to make a Zero feed-in system with Victron & Fronius. the Venus (GX) device controls the Fronius output power.
• Automated network discovery: The GX Device will automatically scan for PV-inverters on the local network if no PV-inverters were found previously or if a previously-found PV-inverter cannot be contacted.
• Inverter system placement: Configure the position relative to the Multi or Quattro (is it: AC Input / AC Output).
• Polyphase output assignment: Configure the phase for each inverter in the list.
• Datamanager hardware configuration: Make sure the “IP Switch” on the Fronius Datamanager is on position “A”.
• Network infrastructure link: Connect both, the Fronius and the GX Device, on the same LAN network, either directly with a LAN cable or using a network switch.
• Modbus export protocol: **Set Data export via Modbus to tcp.
• SunSpec register format: set Sunspec Model Type to int + SF.
• Off-grid microgrid synchronization: To make sure that the Fronius PV inverter works well with Victron inverter/chargers, both must be configured with the right 'frequency shift settings'.

SunSpec Modbus TCP Architecture & Network Configuration

Integrating Fronius PV inverters (Primo, Symo, Eco) with Victron GX controllers allows comprehensive energy monitoring, ESS zero-export power control, and synchronized off-grid microgrid operation.

The Victron & Fronius Inverter Integration utilizes SunSpec Modbus TCP Protocol (Port 502) with SunSpec Model Type: int + SF, providing Dynamic Zero Feed-In (ESS) and Frequency Shift Droop (Island) control:

• Fronius Datamanager: IP Switch on "A", Modbus TCP Export, int + SF Register, Ethernet / WiFi LAN.
• Network Discovery: Auto Scan on LAN, AC-in / AC-out Pos, Phase L1/L2/L3 Map, VRM Dashboard.
• Power Control: Venus Throttl, Zero Feed-in, Freq Shift Droop, ESS Dynamic.

Installation Rules & Network Setup

1. Local Network Connection: Ensure you Connect both, the Fronius and the GX Device, on the same LAN network, either directly with a LAN cable or using a network switch. and verify Make sure the “IP Switch” on the Fronius Datamanager is on position “A”.
2. SunSpec Protocol Configuration: Log into the Fronius web portal and Set Data export via Modbus to tcp. ensuring you set Sunspec Model Type to int + SF.
3. GX Device Scanning: Verify The GX Device will automatically scan for PV-inverters on the local network if no PV-inverters were found previously or if a previously-found PV-inverter cannot be contacted.

Inverter Topology & Phase Mapping

Within the Venus OS interface:

• System Positioning: Installers Configure the position relative to the Multi or Quattro (is it: AC Input / AC Output).
• Phase Alignment: Accurately Configure the phase for each inverter in the list to guarantee correct multi-phase energy accounting.

Dynamic Zero Feed-In & Frequency Shifting

• ESS Zero-Export Control: Functions because The Fronius Zero feed-in feature - which is part of an Energy Storage System ESS - works on all supported models except the IG Plus. where It is possible to make a Zero feed-in system with Victron & Fronius. the Venus (GX) device controls the Fronius output power.
• Off-Grid Frequency Droop: Safeguards islanded batteries since To make sure that the Fronius PV inverter works well with Victron inverter/chargers, both must be configured with the right 'frequency shift settings'.

Technical Specifications & Parameter Summary