opencar
Well-known member
TickTock said:TickTock said:I think we just put a stake in this. I zeroed out all the weak coefficients and now know Hx to be purely a function of Ah and nothing more. Simplifying the formula I get good results with:
Fn = 0.01645*(Ah-16)
Sorry folks - no ESR here.
Grabbed a few datapoints from the forum to see how well it holds up on other's vehicles. It looks good on folks like Pipcecil who are at similar levels of capacity:
http://www.mynissanleaf.com/viewtopic.php?f=30&t=8802&hilit=hx+ahr&start=6874 *** 0.4495 ~= 0.4494 = 0.01645*(43.32-16)
..but not newer batteries like mwalsh': http://www.mynissanleaf.com/viewtopic.php?f=44&t=12789&hilit=hx+ahr&start=482 *** 0.6769 != 0.535 = 0.01645*(48.5-16)
So while strongly correlated to Ah for 4 bar losers we need more data, it appears, to cover the entire range.
i don't think mwalsh had the P3227 update so maybe that's the reason for the discrepancy?