I was not able to configure solar charging. Mainly due to the fact, that my Energymeter is a Kostal Energy Meter G2 which seams not to be supported (yet).
However, I have some proposals for energymetering:
Support TCP Modbus + Sunspec, so many more devices could be compatible or/and allow configuration of the respective registers
Support TCP Modbus or a API also for control to be able to integrate in customs enviroment