dgpcolorado wrote:August mileage:
Wall-to-wheels: 4.46 miles/kWh
Dash: 5.0 miles/kWh
Charging efficiency at 240 V, 16 A: ~89% ...
It appears your reported charging efficiency has increased from ~80% to ~89% since you begin your (excellent) observations on this thread. Have I stated this correctly?
I think you might want to consider the possibility that your LEAF is not reporting consistent kWh use figures, and so is miscalculating the dash m/kWh.
Consider what I have seen, using (admittedly less precise) time of charge to 80% observations:
http://www.mynissanleaf.com/viewtopic.p ... 4&start=30
...I did not meter my charge a year ago, but I did record the charge time, and also got an accurate 16 amp 240v recharge time on 9/8/12. It took 4 hours and 16 minutes to reach 80% (and another one hour and 11 minutes to reach “100%”) following this trip.
Assuming a 3.75 kWh/h draw from my 16 a modified Panasonic charger, and the 16.7 total capacity from VLBW to 100% charge, I believe that this would indicate a charging efficiency from ~VLBW to the “80%” level of ~96%, which is implausible, in light of all reports of charging efficiency by others.
This compares to a recharge time of ~4 hours 25 minutes to reach “80%” following my first range test, on 9/7/11, with a reported 18.7 kWh used from 100% to about the same capacity level, ~VLBW.
This would seem to indicate a charging efficiency of from ~VLBW to 80%” a year ago of ~89%. but remember, this was recorded after my LEAF had seen most a of a Summer of use, so my LEAF’s m/kWh use reports might have already started to “drift,”meaning this percentage may already have been somewhat inflated, and the kWh use similarly understated...
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I now wonder if I would have seen results close to (though probably not matching, as I was charging at considerably higher battery temperatures) the ~80% efficiency that you did, if I had monitored it from new, before my first Summer of ownership?