The Victron Multiplus-II 48/3000 and 48/5000 are back on the CEC list, which allows them to be connected to the grid in Australia under grid code “Australia A”. The category that these inverters have been approved for (AS/NZS 4777.2 APPENDIX M) means that they cannot export any of their own generat…

Have you looked at 4. Configuration

Thanks, yes I have checked the Modbus parameters on the Fronius. All works fine within the Cerbo’s Nodered also, so no comms issues.

Is everything up to date - the fronius, Victron inverters, gx and all the etc etc.

Try doing the direct to cerbo connection and see if it is a networking issue.

@Gareth_Thomas did you find a fix for your problem or is Appendix M grid code on Victron, where your setup is trying to only export AC PV coupled excess solar, is always going to disconnect Fronius be it over modbus or frequency shifting?

ModBus control of Fronius Inverter in ESS grid connect system - Australia

Node-RED

Gareth_Thomas (Gareth Thomas) 8 June 2026 12:00 8

I’ve never really gotten to the bottom of it, but I have been assure by others that they have made it work. Very confusing!

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ModBus control of Fronius Inverter in ESS grid connect system - Australia

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