TickTock said:
Although I have no doubt I am down from last year, the capacity does appear to be following a seasonal fluctuation of around 30 gids.
The red points in the graph are gids*.08 (kwH) after a 100% charge. Blue is the same for 80%. It looks like we may see some return of capacity after summer ends. Am looking forward to October so I can see how I compare to last year.
Available energy in the graph is (miles_driven+GOM_remaining_range)/efficiency recorded at the end of each day (as long as the GOM was < 30 to limit the inaccuracy of the GOM). So this is roughly the usable battery capacity.
Thanks for this report.
TickTock's battery performance was an outlier from the beginning, and I think using GOM as a remaining charge indicator is probably only valid IF the energy consumption on different charges is very consistent.
I think that the seasonal variation hypothesis might be born out by future observations, and the near-hysteria on the several threads over the last few days, may turn out to be somewhat overblown.
All LEAF batteries probably begin to lose capacity shortly after manufacture. While I can't confirm the level of loss on my car yet, I'd be very surprised, if some loss does not exist.
The timing of these recent bar disappearances could also reflect LEAF battery management, so both the 11 bar reports,and the recent rapid drops in Gid counts to 100% charge reported by a few, could be somewhat misleading, as to actual battery capacity.
Is "full" for the 11 bar LEAFs (100%) still 94-95% of total capacity (AFAIK, only Phil has reported the ability to measure this, right?) or are the Phoenix LEAFs perhaps protecting their batteries from future damage, due to the rising seasonal temperatures, by restricting the available charge percentage at the "100% charge" setting?
Maybe once a LEAF battery loses a smaller percentage of total battery capacity, battery management kicks in to limit charging levels, particularly at high temperatures (which I assume Phoenix has seen recently), to slow future degradation of capacity. This could explain the sudden bar and100% charge Gid loses.
11 bars might be accurately reflecting a reduction in availability of the "top" of the battery, not that total capacity has declined 15%, and so not present such a scary future prospect.
Try charging to "80%", see how they correlate to temperature, and what kind of reductions you get, from your Gid counts at 80% last year.
If this reduction is found to be consistently well below 15%, we all might find those results reassuring.