question

@victronvalhowell6283

You can manipulate the switch state based on SOC from the BMV.

You know the switch state under the Multiplus on the GX? So inverter only or on. The same switch state is available In node red.

I want the inverter to handle all AC loads until the SOC drops below 70%. At that point I want the AC in to come on and the charger to charge the batteries until they complete an absorb phase, or until the SOC is greater than 90% (either measure works for me).

Your question, which hasn't been answered, is a good one. I just logged on to ask the exact same question. I spend 2 months of the year on shore power. It kills me to see the Multiplus maintain my batteries at 100% using shore power - while my 2400W solar array is unused. I turn on the coffee pot and the shore power usage jumps up rather than pulling from the full batteries. It seems like this is just the sort of problem Node Red is meant to solve.

After I've developed and tested a flow to solve the problem, I'll publish it here or send it to you directly.

Rich on Pogeyan

I have developed and tested a flow that puts the Multiplus in Inverter-only mode when the batteries are full and shore power is available. It switches back to "On" mode when the state of charge falls to 50%. I also made a crude dashboard interface.

I don't know how to share the flow on this forum. I attempted to paste the compact JSON export in a post, but the Admins didn't allow it to publish. If anyone wants the code, send an email to rich (at) pogeyan (dot) net.

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Only\") {\n msg.payload = 2;\n}\n\nelse if (SOC <= 50 && MPCtl == \"Auto\" && SPAvail == \"Available\" && MPMode != \"On\") {\n msg.payload = 3; \n}\n\nelse {\n \n}\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":850,"y":640,"wires":[["faf665df1f03eb3e"]]},{"id":"faf665df1f03eb3e","type":"victron-output-vebus","z":"9dcfcfb3a65c9637","service":"com.victronenergy.vebus/276","path":"/Mode","serviceObj":{"service":"com.victronenergy.vebus/276","name":"MultiPlus-II 12/3000/120-32"},"pathObj":{"path":"/Mode","type":"enum","name":"Switch Position","remarks":"<p>Note that <tt>/ModeIsAdjustable</tt> needs to be set to 1.</p> ","enum":{"1":"Charger Only","2":"Inverter Only","3":"On","4":"Off"},"writable":true},"initial":"","name":"Write the Mode (AKA \"Switch Position\") to the Multiplus","onlyChanges":false,"x":1760,"y":640,"wires":[]},{"id":"d28ae852d583edfd","type":"inject","z":"9dcfcfb3a65c9637","name":"Triggers the Automation Logic Every Second","props":[{"p":"payload"}],"repeat":"1","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"5","payloadType":"num","x":300,"y":640,"wires":[["27a77163947f4805"]]},{"id":"ac263cddfbc61f74","type":"comment","z":"9dcfcfb3a65c9637","name":"Automation Logic Narrative","info":"# Set the Multiplus Mode to Inverter-Only if:\n\n - The batteries are full and\n - This mode control scheme is enabled using the dashboard and\n - The shore power is available and\n - The Multiplus isn't already in Inverter-Only mode\n\n# Set the Multiplus Mode to \"On\" if:\n\n - The battery charge drops below 50% and\n - This mode control scheme is enabled using the dashboard and\n - The shore power is available and\n - The Multiplus isn't already in \"On\" mode\n\n","x":850,"y":600,"wires":[]},{"id":"6f1a0792dd604b76","type":"ui_group","name":"Multiplus Mode Control","tab":"c5516b35d65c2712","order":1,"disp":true,"width":"6","collapse":false,"className":""},{"id":"c5516b35d65c2712","type":"ui_tab","name":"Home","icon":"dashboard","disabled":false,"hidden":false}]

I think, an easy solution would be just the tempory adaptation of the SOC min value in ESS configuration.
In case the SOC defnition is 5% larger than current SOC, MultPlus's start the charging process by themselves. Btw. SOC definition in GX can be defined with a 1% granularity by ModBus.