i'm working on a arduino based BMS which have to measure voltage from a multicell battery which is connected in series. i can measure the voltage of the cells by individually grounding them. But what i want to achieve is to measure single cell battery voltage when they are connected in series. I have tried using op-amp to try a voltage subtractor circuit in order to monitor the voltage difference between the cells. the op-amp which i'm using is LM324N. When connecting the cell in respective pins of the LM324N i'm getting a value greater than the voltage difference between the cells. Can any experts please guide me through this. this is the circuit i'm using.
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