Fronius - Modbus TCP

Installation

1. 1In the Fronius web UI, navigate to Communication, enable Modbus TCP, and set SunSpec Model Type to float. Save and reboot the Datamanager if prompted.
2. 2Note the inverter IP address on your LAN. Set a DHCP reservation so the address does not change.
3. 3In ModbusCloud, add a new device with protocol Modbus TCP, port 502, slave ID 1, and the inverter IP.
4. 4Import the Fronius Modbus TCP template. Readings appear within a few polling cycles.

Things to watch for

01

The inverter is online but ModbusCloud shows timeouts. What to check?

Verify that Modbus TCP is actually enabled in the Fronius Datamanager web UI. The inverter responds to ping even when Modbus is off. Also confirm the SunSpec Model Type is float and not int+SF for this template.

02

AC power reads zero at night. Is the template broken?

That is correct behaviour. Fronius inverters shut down when there is no PV production, so all AC values drop to zero or report as not valid. Lifetime energy stays accurate because the Datamanager retains it.

Registers (15)

15 read / 0 write

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