question

@motylu would you mind sharing your node red with me/us.

Yes, of course, I can share my simple solution. I am not professional programmer, so maybe some parts could be done more effectively, but is functional...

It is based on actual battery SOC (I am using Pylontech batteries), ESS min. SOC setting, actual EVCS mode and change of EVCS status. This algorithm allows to discharge Pylontech batteries down to 90% - this can be changed in "Set ESS min. SOC" node. When EVCS is in manual mode and status is changed to Charging, then algorithm save actual ESS min. SOC setting to file in OS filesystem and change it according to actual battery SOC:

• If actual battery SOC is higher than or equal to 90%, ESS min. SOC is set to 90%.
• If actual battery SOC is lower than 90%, ESS min. SOC is set to actual battery SOC.

When EVCS status is changed to another than Charging, algorithm automatically set ESS min. SOC setting to previous value according to saved value from file.

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SOC","func":"// Get value\nlet ActualBatterySOC = flow.get(\"ActualBatterySOC\") || 100;\n\n// Set variables\nlet ESSMinSOCCharging = 90;\nlet ESSMinSOCSetting;\n\n\n// Check actual battery SOC and set min. SOC\nif ( ActualBatterySOC < ESSMinSOCCharging )\n    {\n        ESSMinSOCSetting = ActualBatterySOC;\n    }\nelse\n    {\n        ESSMinSOCSetting = ESSMinSOCCharging;\n    }\n\n// Set output message\nmsg_ess_soc = { payload: ESSMinSOCSetting };\nmsg_ess_soc.topic = \"ESSMinSOCSetting\";\n\n// Send output message\nreturn msg_ess_soc;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":1810,"y":660,"wires":[["89e5f426b047518b"]]},{"id":"07fa9a708130af48","type":"comment","z":"d456f73ce560c1e1","name":"Set min. SOC","info":"","x":110,"y":620,"wires":[]},{"id":"b8f82b578c9aaec5","type":"victron-input-battery","z":"d456f73ce560c1e1","service":"com.victronenergy.battery/512","path":"/Soc","serviceObj":{"service":"com.victronenergy.battery/512","name":"Pylontech battery"},"pathObj":{"path":"/Soc","type":"float","name":"State of charge (%)"},"name":"","onlyChanges":false,"roundValues":"0","x":190,"y":180,"wires":[["da10af03d5b0f488"]]},{"id":"5c9d8a57cb650b0e","type":"comment","z":"d456f73ce560c1e1","name":"Load battery SOC","info":"","x":130,"y":140,"wires":[]},{"id":"da10af03d5b0f488","type":"function","z":"d456f73ce560c1e1","name":"Save actual battery SOC","func":"// Save setting\nflow.set(\"ActualBatterySOC\", msg.payload);\n\n// Set output message\nmsg_actual_soc = { payload: msg.payload };\nmsg_actual_soc.topic = \"ActualBatterySOC\";\n\n// Send output message\nreturn msg_actual_soc;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":490,"y":180,"wires":[[]]},{"id":"fbad39ff55cbb006","type":"file in","z":"d456f73ce560c1e1","name":"Load ESS min. SOC from file","filename":"/data/home/nodered/ESSMinSOC","filenameType":"str","format":"utf8","chunk":false,"sendError":false,"encoding":"none","allProps":false,"x":1160,"y":740,"wires":[["a8b633695f60abbd"]]},{"id":"a8b633695f60abbd","type":"json","z":"d456f73ce560c1e1","name":"Convert string to number","property":"payload","action":"obj","pretty":false,"x":1430,"y":740,"wires":[["89e5f426b047518b"]]},{"id":"6382a240761616fb","type":"switch","z":"d456f73ce560c1e1","name":"Check if EVCS mode is 0 (manual)","property":"ActualEVCSMode","propertyType":"flow","rules":[{"t":"eq","v":"0","vt":"num"}],"checkall":"true","repair":false,"outputs":1,"x":460,"y":700,"wires":[["d84ead4c0e28c0ef"]]},{"id":"89e5f426b047518b","type":"victron-output-ess","z":"d456f73ce560c1e1","service":"com.victronenergy.settings","path":"/Settings/CGwacs/BatteryLife/MinimumSocLimit","serviceObj":{"service":"com.victronenergy.settings","name":"Venus settings"},"pathObj":{"path":"/Settings/CGwacs/BatteryLife/MinimumSocLimit","type":"integer","name":"Minimum Discharge SOC (%)","writable":true},"initial":"","name":"","onlyChanges":false,"x":2120,"y":700,"wires":[]},{"id":"d84ead4c0e28c0ef","type":"switch","z":"d456f73ce560c1e1","name":"Check if EVCS status is 2 (charging) or another","property":"ActualEVCSState","propertyType":"flow","rules":[{"t":"eq","v":"2","vt":"num"},{"t":"neq","v":"2","vt":"num"}],"checkall":"true","repair":false,"outputs":2,"x":820,"y":700,"wires":[["6a4fb9de2455a630"],["fbad39ff55cbb006"]]},{"id":"6c4a4ebed848bb55","type":"file","z":"d456f73ce560c1e1","name":"Save ESS min. SOC to file before change","filename":"/data/home/nodered/ESSMinSOC","filenameType":"str","appendNewline":false,"createDir":false,"overwriteFile":"true","encoding":"none","x":1520,"y":660,"wires":[["033522ecda4ff371"]]},{"id":"6a4fb9de2455a630","type":"function","z":"d456f73ce560c1e1","name":"Load actual ESS min. SOC setting","func":"// Get value\nlet value = flow.get(\"ActualESSMinSOCSetting\") || 100;\n\n// Set output message\nmsg_ess_actual_min_soc = { payload: value };\nmsg_ess_actual_min_soc.topic = \"ActualESSMinSOCSetting\";\n\n// Send output message\nreturn msg_ess_actual_min_soc","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":1180,"y":660,"wires":[["6c4a4ebed848bb55"]]},{"id":"b5c50028dedc9e3b","type":"comment","z":"d456f73ce560c1e1","name":"Load ESS min. SOC setting","info":"","x":160,"y":260,"wires":[]},{"id":"7685ffe6edcea0c8","type":"function","z":"d456f73ce560c1e1","name":"Save actual ESS min. SOC","func":"// Save setting\nflow.set(\"ActualESSMinSOCSetting\", msg.payload);\n\n// Set output message\nmsg_actual_ess_min_soc = { payload: msg.payload };\nmsg_actual_ess_min_soc.topic = \"ActualESSMinSOCSetting\";\n\n// Send output message\nreturn msg_actual_ess_min_soc;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":540,"y":300,"wires":[[]]},{"id":"af8be1e0a7b86137","type":"victron-input-ess","z":"d456f73ce560c1e1","service":"com.victronenergy.settings","path":"/Settings/CGwacs/BatteryLife/MinimumSocLimit","serviceObj":{"service":"com.victronenergy.settings","name":"Venus settings"},"pathObj":{"path":"/Settings/CGwacs/BatteryLife/MinimumSocLimit","type":"integer","name":"Minimum Discharge SOC (%)"},"name":"","onlyChanges":false,"x":210,"y":300,"wires":[["7685ffe6edcea0c8"]]}]

A made some improvements and also added rounding for SOC setting (rounding down to nearest multiple of 5 due to possible ESS setting in Cerbo GX).

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SOC","func":"// Get value\nlet ActualBatterySOC = flow.get(\"ActualBatterySOC\") || 90;\nlet ActualESSMinSOCSetting = flow.get(\"ActualESSMinSOCSetting\") || 90;\n\n// Set variables\nlet ESSMinSOCCharging = 90;\nlet ESSMinSOCSetting;\n\n\n// Check actual battery SOC and set min. SOC\nif ( ActualBatterySOC < ESSMinSOCCharging )\n    {\n        ESSMinSOCSetting = Math.max(( Math.floor(ActualBatterySOC / 5) * 5 ), ActualESSMinSOCSetting);\n    }\nelse\n    {\n        ESSMinSOCSetting = ESSMinSOCCharging;\n    }\n\n// Set output message\nmsg_ess_soc = { payload: ESSMinSOCSetting };\nmsg_ess_soc.topic = \"ESSMinSOCSetting\";\n\n// Send output message\nreturn msg_ess_soc;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":1810,"y":660,"wires":[["89e5f426b047518b"]]},{"id":"07fa9a708130af48","type":"comment","z":"d456f73ce560c1e1","name":"Set min. 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SOC to file before change","filename":"/data/home/nodered/ESSMinSOC","filenameType":"str","appendNewline":false,"createDir":false,"overwriteFile":"true","encoding":"none","x":1520,"y":660,"wires":[["033522ecda4ff371"]]},{"id":"6a4fb9de2455a630","type":"function","z":"d456f73ce560c1e1","name":"Load actual ESS min. SOC setting","func":"// Get value\nlet value = flow.get(\"ActualESSMinSOCSetting\") || 100;\n\n// Set output message\nmsg_ess_actual_min_soc = { payload: value };\nmsg_ess_actual_min_soc.topic = \"ActualESSMinSOCSetting\";\n\n// Send output message\nreturn msg_ess_actual_min_soc","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":1180,"y":660,"wires":[["6c4a4ebed848bb55"]]},{"id":"b5c50028dedc9e3b","type":"comment","z":"d456f73ce560c1e1","name":"Load ESS min. SOC setting","info":"","x":160,"y":260,"wires":[]},{"id":"7685ffe6edcea0c8","type":"function","z":"d456f73ce560c1e1","name":"Save actual ESS min. SOC","func":"// Save setting\nflow.set(\"ActualESSMinSOCSetting\", msg.payload);\n\n// Set output message\nmsg_actual_ess_min_soc = { payload: msg.payload };\nmsg_actual_ess_min_soc.topic = \"ActualESSMinSOCSetting\";\n\n// Send output message\nreturn msg_actual_ess_min_soc;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":480,"y":300,"wires":[[]]},{"id":"af8be1e0a7b86137","type":"victron-input-ess","z":"d456f73ce560c1e1","service":"com.victronenergy.system/0","path":"/Control/ActiveSocLimit","serviceObj":{"service":"com.victronenergy.system/0","name":"Venus system"},"pathObj":{"path":"/Control/ActiveSocLimit","type":"integer","name":"Active SOC limit (%)"},"name":"","onlyChanges":false,"x":180,"y":300,"wires":[["7685ffe6edcea0c8"]]}]

Hi!
I imported and past flow but not working. do you have any sugestions? Thanks

Here is new version. I made some changes and improvements regarding new Cerbo GX and EVCS firmware versions. Now I am using the latest versions - Venus OS 3.12 and EVCS 1.27.

For example I added automatic enable/disable feed-in in EVCS automatic mode, primary for better recognition of excess energy and start EV charging... I used set global variable on another flow, but if you directly add "ESS Control" node from Victron palette with appropriate properties (ESS = "Venus setting" and Measurement = "Feed excess DC-coupled PV into grid") behind the "Set disable/enable feed-in (based on EVCS mode and status)" node, it will be also functional.

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SOC","func":"// Get value\nlet ActualBatterySOC = flow.get(\"ActualBatterySOC\") ?? 90;\nlet ActualESSMinSOCSetting = flow.get(\"ActualESSMinSOCSetting\") ?? 90;\n\n// Set variables\nlet ESSMinSOCCharging = 90;\nlet ESSMinSOCSetting;\n\n\n// Check actual battery SOC and set min. SOC\nif ( ActualBatterySOC < ESSMinSOCCharging )\n    {\n        ESSMinSOCSetting = Math.max( ( Math.floor( ActualBatterySOC / 5 ) * 5 ), ActualESSMinSOCSetting);\n    }\nelse\n    {\n        ESSMinSOCSetting = ESSMinSOCCharging;\n    }\n\n// Set output message\nmsg_ess_soc = { payload: ESSMinSOCSetting };\nmsg_ess_soc.topic = \"ESSMinSOCSetting\";\n\n// Send output message\nreturn msg_ess_soc;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":3050,"y":680,"wires":[["89e5f426b047518b"]]},{"id":"07fa9a708130af48","type":"comment","z":"d456f73ce560c1e1","name":"Set min. 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Hello everyone,
I would very much welcome such a feature.
So far I have written a small Python script that remembers the min_SOC (all via modbus to the CERBO GX). If the charging process is started when setting the sceduled or manual mode, the min_SOC of the ESS is set to the current SOC. If the charging process is ended, the initial min_SOC is restored. This prevents the Pylontec battery from discharging while the car is being charged in manual mode (or sceduled).

Enclosed is the programme.

Translated with DeepL.com (free version)

ev_cerbo.py.txt