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- Jun 13, 2011
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- 3,809
The same effect has been observed with GIDs. The only difference is that Ah values were not available last year, and we don't know as much about this value and its idiosyncrasies as we do about GIDs. It's more convenient to measure, that's for sure. Also, GIDs depends on cell balancing, not just the current pack capacity, which introduces another variable.klapauzius said:But since the Leaf-AHs are temperature dependent in exactly the opposite way a real world battery would behave, I am curious how real "AH" compare to "LEAF-AH" for a given temperature.
Yes, both Ah figures and GIDs are dependent on the BMS and other software and instruments in the car. That's a given. We have not seen many LEAF owners, who would be willing to take raw measurements of the pack and the cells. There were several similar debates last year, where the accuracy and the veracity of these values was questioned. You are obviously correct and right to raise this point, but unfortunately it's all that is available.
Anything from the CAN bus, including pack voltage, could be of interpretative and of synthetic nature. So far, GIDs have aligned well with range predictions, and the observations collected last year. This led to the correct conclusion that the packs were in fact degrading in hot locales, and owners there did not observe primarily software and gauge errors. The likelihood that Ah is a legitimate proxy to GIDs measured on a full charge is good or very good.