I'm working on a three cell LIPO battery cell voltage monitor using three differential op-amps.
I had the circuit I designed below printed on a PCB and have assembled the board, but I am getting strange results on the output of op-amp 1 (Op1_output.) Op2_Output and Op3_Output work as expected.
When connected to the 3 cell LIPO (cell voltage for each cell = 3.8V,) Op1_output is reading 4.6V as opposed to the expected 3.8V. I have tested all the connections and also soldered 3 separate boards in case there was an issue with my connections, but the results are always the same.
I know that I can simply read the 3.8V directly because that cell is the first in the series, but I'm curious as to what my issue is, as creating the circuit in a simulator is yielding the expected results.
Any insight is greatly appreciated.