importance of weights in optimization

Hi,

This code written below is taken from matlab example , https://ww2.mathworks.cn/matlabcentral/fileexchange/73139-microgrid-energy-management-system-ems-using-optimization?s_tid=prof_contriblnk

Can someone please help me to understand the importance of weights in optimisation and and why final weight is multiplied with Ebatt in the objective function ?

% Minimize cost of electricity from the grid
prob.ObjectiveSense = 'minimize';
prob.Objective = dt*Cost'*PgridV - FinalWeight*EbattV(N);

[johnnynoc4sh]

I´m also working on this example. Unfortunately I also couldn´t figure out, what the mentioned line means. The documentation lacks this information. I guess it is about giving the solver the information, that a certain state of charge at the end of the optimization process should be archieved. Since the documentation lacks informations it is not clear what kind of unit FinalWeight has.