I will do a project on 10kW PV ESS system. It has already been designed (PV+BESS+HEMS), funded by external company and they are using different products of inverter and BMS. I have read research papers regarding load management, metering, HEMS operation and BESS performance..In those papers there are several techniques used for control modeling in system(MPC,MILP etc) and some papers focused on theoretical approach to conduct cost analysis, calculated Payback period,billing price and other parameters. What kind of control modeling and mathematical approach should i use for analyzing PV+BESS, Load management to optimize the installed system ? I am not getting any idea from where to start the research on already designed system.. Responses would be much appreciated