Hey I am also working on a project to design a battery health analyzer. I'm trying to implement the AC conductance test ( or the 4 wire kelvin test) using a PIC micro controller in order to calculate the internal resistance of a battery. Could you help me out with the theory? I'm unsure of the wave specifications that i should use to inject the battery with.I have a battery which supplies a true-sinewave inverter, and I'd like to measure the battery conductance/resistance/impedance/admittance in situ.
The inverter current varies as I=Io.sin^2(ωt) almost reaching zero around the zero crossings of the inverter output voltage.
I have a current shunt and a voltage divider connected to A/D inputs, to measure the battery current and voltage.
Does anyone have a neat algorithm that could derive the battery conductance?
Mod: Link to old thread @Ian0
https://forum.allaboutcircuits.com/threads/measurement-of-battery-conductance.178887/post-1628059
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