I asked this questio before, but the problem has got a lot bigger so hoping for other suggestions...
I am trying to minimise the function
Cost = (units used X cost of unit) + cost of storage + cost of dispatch
cost of dispatch = max(units used)
cost of storage = variable
units used and cost of unit are fixed.
I have two stores and two dispatches. The larger the stores and dispatches, the smaller the operating cost but larger capital cost. I'm using a problem-based solver approach.