Victron, Home Assistant, Node-red, Modbus, scheduled battery charge

Q&A and troubleshooting
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1

I’m working with Victron CerboGX, Multiplus-II and a Lifepo4-battery as part of my solar setup. I also have Homeassistant with Node-red installed, and now I want to enable one schedule, in the ESS “Scheduled charge levels" setting from node-red by Modbus, in Home Assistant (and not in Cerbo, Venus OS large) so I can charge the battery at cheapest hours in the night to a defined soc value.

Setup and communication work fine, but I can’t find the Modbus register value to enable/disable the ESS schedule anywhere.

I’ve also looked here: CCGX-Modbus-TCP-register-list-3.50.xlsx

Does anyone have this register value?

I can do a lot of workarounds, but the one I need suits me best, and I don’t want to hand control over to Dynamic ESS.

The next best thing would be enable/disable schedule by MQTT, but this leads me to the same dead end.

2

Too complicated…

3

You could start by using an ESS schedule simmilar to this:

Screenshot_20241113-045655_Firefox_Beta
Screenshot_20241113-045655_Firefox_Beta2160×1080 104 KB

and then use the programm dbus-spy on venus-os to search for what you need. This is still not the register number, but an approch which will help for a node-red solution.

4

Thank you for your suggestion to an approach. Haven’t thought of that.