EV charging constraints: proper inequalities should be introduced
to express that the battery cannot exceed its maximum
charge capacity and cannot charge at a rate greater than
its charging rate. Additional equations or inequalities should
be introduced to model the EV states of charge at certain times
of the period of study (e.g. before the first morning commute
and at the end of the day). Finally, inequalities to ensure the
EV power draw being always between the bid capacity limits
should be considered as well.