question

@Image6255 Your Victron storage system's ET112 is monitoring and responding to your grid setpoint. I'd expect your AIO to ONLY use excess PV during the day to charge its battery so I am intrigued as to why it introduces an AC load on the grid side to which the Victron responds? One possible reason is that the AIO is very small and drops well below a set SOC threshold (given the large discharge you mentioned) and has to charge back up to it typically from the grid if there is e.g. not enough solar? Was this the case before you added the Victron?

When I turn on a big load, both systems start discharging. That's especially easy to reproduce in the evenings, when there isn't enough PV.

When I turn the load off, the AIO senses grid export it immediately starts charging its battery. Victron continues to feed it. The AIO's manufacturer refuses to alter its behavior or add an option to disable charging on export.

Nope, my use case does not include charging from the grid during day time.

I would get rid off external batterybank.Put energymeter to legacy PV so it gets integrated to Victron system that way. Use only Victron battery bank. If you need more capacity get another Multiplus but still common battery bank.

Ok, that's an obvious idea. Although it should be possible to implement in Victron software - all the data is already there. Multiplus sees my legacy system readings. It just needs to avoid discharging its battery into the legacy system.

Ok, I came up with a node-red flow which works and has better latency than my home assistant rule. Still, I think this should be a core feature because node-red itself introduces some unnecessary latency. Competition (myenergi) does have "avoid drain/avoid charge/avoid both" modes specifically for such scenario.

This rule only blocks Victron -> AIO feed, obviously the reverse feed cannot be blocked without additional data from AIO.

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