Edit 6:03 am. Yes, it's off topic, but very useful, IMO.
Moved to new thread here:
http://www.mynissanleaf.com/viewtopic.php?f=31&t=10293&p=234520#p234520" onclick="window.open(this.href);return false;
Nekota said:
edatoakrun said:
.....
So Nekota, unless you have a recharge calculation that supports either the gid or dash energy use calculations, I suggest neither you or anyone else consider them an accurate source for your LEAF's actual battery capacity.
I pulled out the charge measurements for the dedicated meter reading (samples every 6 seconds) for the LEAF EVSE and came up with 21.1 KWhr AC into the LEAF charger to recharge from 24 GID to 265 GID, battery voltage 393 Volts and 5 temperature bars. So pick your efficiency number for the LEAF 3.3 KW charger - I used :
0.90 x 21.1 = 18.99
0.85 x 21.1 = 17.93
0.80 x 21.1 = 16.88
If I use the 17.8 value I get a charger efficiency of 17.8/21.1 or 84%. I am reporting the numbers and hope they help with the understanding of the LEAF battery. I am happy to be driving an electric car and it's working well after 15,000 miles...
I suspect that that that 84% efficiency calculation by gids may be too low, indicating you may have actually recharged with more than 17.8 kWh. Of course, this is not the energy you used during the drive, so battery temperature and other factors might account for some or all of the differential reported by your LEAF (~16.9kWh) as used during the actual drive. See TickTocks record of gid/Wh variability and the apparent seasonal trend, to see why your gid calculation of kWh use may have another source of inaccuracy:
https://docs.google.com/spreadsheet/ccc?key=0An7gtcYL2Oy0dHNwVmRkNkFnaEVOQTVENW5mOTZlb0E&pli=1#gid=3" onclick="window.open(this.href);return false;
The ~16.9kWh calculated for your LEAF on this drive (by nav screen and odometer miles) should be exactly what CW would have reported (if updated). The ~80% recharge efficiency that kWh use implies happens to be very close to what I am seeing, using the less precise method of timing my charges (I don't have a meter).
And of course, I believe the fact that my LEAF
has not lost significant range, as well as the unlikely reported decline in charging efficiency over the last 13 months, indicates that the actual problem with my LEAF is the underreporting of kWh use reflected in the dash and nav screen m/kWh and also the CW reports.
http://www.mynissanleaf.com/viewtopic.php?f=31&t=9064&start=30" onclick="window.open(this.href);return false;
Again, since your LEAF and mine have near-identical histories, yours a few thousand more miles, mine (probably) slightly higher ambient peak temperature exposure, I would expect the loss of battery capacity to be very similar between the two LEAFs, and the percentage of error in kWh use reports might also be expected to be very similar, as it in fact seems to be.
I am very happy with my LEAF overall, and particularly with its present battery capacity, but last week I opened complaint with Nissan regarding the apparent kWh use report error.
Since I live in a region with virtually no public charging infrastructure, I have needed to rely on accurate kWh use reports more than many other LEAF drivers, both to calculate my present capacity, and to relate past driving experiences to my future driving plans. The way I see it, this "gauge error" is a very serious problem for me. And it is certainly a serious problem for anyone else, trying to accurately calculate their own loss of capacity over time.