Obviously pseudo code, but what would it take and where (MPIIs, Cerbo large), to simply check if there is any solar power coming in and if so, shutdown the AC input lines (and thereby kill the possibility of feeding back into the grid)?
Thanks.
Cerbo large means you have Node Red.
Each solar charger has a key named MppOperationMode, which tells you if the MPPT is active. Any value different than 0.
So, inside node red look for that value and then, based on that, disable the MP2 input relay (/Relay/0/State).
Or use one of Cerbo’s relay to drive another relay to cut the AC-IN.
Why don’t you just Disable Feed-In in the settings?
When you configure “individual phase mode”, the multis will avoid feedin on any phase and not just look at the sum of phases. (Less system efficency, but if feedin is prohibited on a per-phase view, needs to be selected)
Cutting off grid-power as soon as there is any PV may end in a shutdown / overload situation, when batteries are depleted and the load is higher than what the current PV would provide.
With the grid connected, the MP2 will still source 25-50W from grid, depending of the individual device “tune”.
This means about 20-30kW monthly / unit. Some people don’t want that - me included - and want to keep the grid totally off.
Of course, in my Multi RS case, it can be configured to connect the grid when SOC drops below a certain level, but I suppose that with MP2 can be configured the same.
hmm, I’m running with a permanent Grid-connection, and my daily grid consumption comes down to 0 - 0.01 kWh…
Nothing permanently pulled from grid.
(Except on a few days where it was intentional)
You are a happy one…
Maybe because your unit is more carefully tuned, maybe more resistive loads or more PF corrected devices…
But with a variable reactive consumers, it can be tricky.
See here: https://communityarchive.victronenergy.com/questions/302121/how-to-prevent-multirrs-from-getting-100wfluctuati.html
PS. We may get off-topic…
If the OP wants AC-IN off when PV>0, I’ve tried to offer a solution, following his exact specs. 
Well, i’m not having a Multi RS, maybe a RS exclusive Issue, idk.
There is always the old school cool use of a daylight switch and a contactor fpr the AC input or connecting it through the aux relay and an assist that ignores ac based on signal.
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Sorry folks, left after posting my question to get a total left knee replacement. Appreciate all the feedback and look forward to reading the responses in detail when i get back home tomorrow night.
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