Stanton wrote:You keep excellent (historical) data.
+1 ...and you publish it! Thanks, TickTock!
Just a few thoughts on this new data:
- It seems like the reports back from Nissan based on the Casa Grande testing are on the level. Hopefully we will hear more details from them soon.
- Based upon TickTock's measurements of energy accepted by the battery, it appears his battery has lost about 6% capacity in 9 months. This is 6% of the capacity 9 months ago, not original capacity. However, these two measurements are with the battery at different temperatures, so the number may be off (since it's possible the battery has different capacity at different temperatures). It would be interesting to have these measurements again in November.
- I wonder if the calibration had somehow degraded or if they have merely recalibrated at a different temperature point. I would suspect the latter, since I would think temperature compensation would handle temperature variations fairly well. So I'm wondering what may have moved off cal? I wouldn't expect voltage measurements to move much over time. Do the Hall-effect sensors degrade over time?
- The car will have to use something as ITS absolute energy reference, and I will assume that is GIDs. That implies that not only did the car think it had less energy available but that driving efficiency would be higher. Energy consumed reports by the car should also have been low.
Hopefully Nissan can use what they have learned to improve the accuracy of the instrumentation in the LEAF.