I am trying to make a test circuit that behaves just like a series battery pack so I can test the functionality of various bms systems. I made this simple series voltage divider and it sort of works. The obvious problem is that if I change the voltage of any cell it also changes the voltage of all other cells and I have to rebalance all of the pots so as to have only one cell out of balance.
My goal is to be able to have a test circuit that have like a 4S battery pack and be able to manipulate the voltage of each test cell independently. Also I want to power the circuit with one voltage source. Any ideas on how to make such a circuit?
Jerry