Since a few months it is allowed in Belgium to use the P1 port of a smart meter as a grid meter for a battery inverter, to limit the grid injection power. I tried connecting the P1 to USB cable which I normally use for Home Assistant, and connected it to a Cerbo GX. But the P1 port is not recognized as a grid meter. Will this be supported in the future by a firmware update of the Cerbo GX? It would be a cleaner solution then the use of CT clamps on a MultiPlus II in a 3 phase system.
You can integrate it via Home Assistant by using dbus mqtt grid integration, but that requires a good refresh rate from the P1 port. Our P1 ports here in Finland only update at 0.1Hz, which makes for an unstable control loop. 1Hz would be good. Check yours before continuing.
What integration is this dbus mqtt grid integration? I already have the Victron GX modbusTCP integration installed, is it the same? The update frequency of my P1 port is 1 Hz.
It’s this one. It works great.
Without a real (fast) grid meter you should be using a virtual meter device in VenusOS large (NodeRED). No need for third party scripts anymore.
You may need to update to the latest, or newer, firmware version but that little extra work is worth it IMO.
I’m using the DSMR Smart Meter integration together with this gateway:
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Ok. That is a new one for me. I used a P1 meter a year ago, but it was pretty slow (1 second refresh). Replaced it with the Victron one. No more WiFi/Ethernet for me.