sunshine_eggo
Happy Breffast!
The other point on the overcharging is that this happens only when the PV is charging. I shut down the Grid source before leaving home this week. So this tells me the Charge controller is not working right. Only option to further explore is to calibrate the Voltage reading between the Batteries (No BMS) and the Inverter. Again no support. I do understand there is a way that can be done.
No. It may also mean your battery cells are imbalanced, and the BMS is triggering over-voltage protection causing the charger to overshoot the voltage. This is a very common problem, and is unrelated to the charge controller.
Set:
05: USE
19: 55.2
20: 54.0
If 19: 55.2 triggers the overcharging, try 19: 54.4V.
What are your settings 12 & 13?