Alright, after some trial and error I finally have it working.
- I had to install and configure the ESS Assistant using the VEConfiguration software
- I used Node-RED to set ESS Mode to 2
- ESS Control Node > ESS: Venus Settings > Measurement: ESS Mode
- Then I can control charging by setting the “Max Charge Power”
- ESS Control Node > ESS: Venus Settings > Measurement: Max Charge Power (W)
I currently set the Max Charge Power to a bit less than my AC-Out value (which is negative when the solar charger is producing), just to prevent feed-in from the grid.
Some notes:
- Setting Max Charge Power to 0 disables charging
- Setting Max Charge Power to a negative value it will show an error and will be ignored
- The Multiplus will not charge at a higher rate than the set Charge Current (Under “Charger” in the Victron Connect App)