I realized this was a little off-topic for the "Data from the Leaf Battery App" thread so starting a new one here:
TickTock wrote:OK. Jeremy shared his CANary logs so I was able to add data from a car with significantly different ESR (he's around 90mO and I'm around 120mO). Was able to fit something fairly close if I included ESC (=1/ESR), AHr, and Temperature.
If I only use ESC, below is the closest fit I could reach:
(the step function at the end of the graph is where my car's data ends and Jeremy's begins)
Adding Pack temperature to the formula it gets better:
And finally adding Ah I get the best fit (I should clarify. This is the Ah capacity (proportional to SOH) - NOT the charge state) :
Adding SOC had very little impact to the fit.
So the Fn I have now is:
Fn = 0.00616*(ESC+84.5) * [1-0.0011*(PackT-1.536)] * [1+0.0322*(Ah-49.4)]
Plugging in ttweed's data, assuming a pack temperature of 29C, and solving for ESC, it appears he has ~120mO ESR (TT, do you know your pack temp?). mwalsh's numbers don't compute because we know the Hx algorithm changed significantly with the P3227 update which he has avoided.
Any other CANary owners (or LEAFers with other means to measure ESR) willing to share their triplogs so we can see if this formula holds up under further scrutiny?