I have an immersion heater on my boat connected to ACOUT2 (Quattro 48/10000), this is switched on by an assistant near 100% SoC to make use of spare solar power. However with an external BMS controlling the Quattro (REC-BMS in my case) it only seems possible to do this using battery voltage not SoC.
This works OK with just solar charging, for example turn on at 53.8V (about 99% SoC) and off at 53.2V (about 95% SoC). But with generator or shoreline charging the battery voltage rises and the immersion turns on too soon, using generator/shoreline power which I don't want (I only want to use excess solar).
Is there any way to use the BMS SoC to trigger the switching instead of battery voltage?
Or can the assistant only turn it on when there's no AC input?
Needs to be done just with assistants on the Cerbo or Quattro not Node Red, the firmware setup is currently supported and maintained by the boatbuilder who doesn't use this.