silverone wrote:achewt wrote:I have definitely seen a trend of Ahr/SOH swinging fairly consistently with ambient temperature since I started tracking data in November 2015. I first posted about it in my regular 6 month cost update Nov 2016 http://kootenayevfamily.ca/cost-update- ... 2-5-years/ (scroll down to the header on LeafSpy). The pattern continued through last winter, noted at http://kootenayevfamily.ca/cost-update- ... 117000-km/ in May of this year. I saw the trend continue into the summer - in June 2017 my Ahr reached 55.89 and 85% SOH again (same as from the previous August, after going to a high of 93%.
I finally lost my first bar after being below 85% for a few months on August 31, 2017. Stats as follows:
Ahr=54.50, SOH=83%, Hx=79.72%, odo=127,413km, 53 QCs
(I haven't posted the L1/L2s, because I often use the charge timer, which inflates this value substantially, counts once when you plug in, another when it starts charging)
I'm now 4,000 km further along here into October, and my stats are now back to (as of Oct 10):
Ahr=55.68, SOH=85%, Hx=82.63%, odo=131,562km
The lost bar hasn't re-appeared... but I'll be curious to see if it does!
We had a nice hot summer from June through first two weeks of September (+30C most days), then high 20C throughout September, and only recently has it cooled down and become rainy. Start here -> http://climate.weather.gc.ca/climate_da ... 7&Month=6#, and click on the next month button to flip through and get an idea of the temps the car sits in all day long in a baking asphalt parking lot. At night, it is in a carport that is built into north-facing hillside, so it does get a chance to cool down usually to 5 or 6 bars, but each day was up to 7. Now with the cool weather in October, starting each day with 4 bars, and after charging for a few hours just before I leave work, it is back up to 5 bars.
TLDR; - in my experience, you can only trend your own personal LeafSpy data year-over-year with roughly similar climate conditions. So I'll carry on and expect to see 87-88% SOH by November, where it will plateau for a few months, then drop right back down in the spring and reach a low by the end of summer 2018. I'm going to take a stab at 80% (assuming I continue with similar commute).
Thank you for posting as well as the detail you've put into data collection.
My climate is remarkably similar to yours based on temperatures, with yours being a little warmer in summer and cooler in spring/fall. Winters appear approximately the same. Thanks to wunderground.com for helping me translate metric units to freedom units for comparison My annual distance driven is also similar.
While I don't anticipate making it to 70,000+ miles before losing my first bar, your year-over-year data suggests that my first bar may last well into next summer. After a wild spring, my data has settled into an Hx and SOH around 89 as well as AHrs in the 57.5 to 59 range. Winter temperatures should pump up my readings significantly, although I'm sure I'll never approach the middle 60s in AHrs again.
I still maintain based on this data swing based on ambient/battery temperatures that it would be difficult to evaluate a Leaf's battery condition in winter - below 40 degrees F - based on juiced readings. This would make it hard to buy a used Leaf and know battery condition from November-April north of the 37th parallel outside of the Pacific Northwest.
Achewt, I wouldn't be surprised at all to see you regain your lost bar briefly when your ambient temperatures maintain around 0C and a battery temperature of not more than 15C.
You're welcome! I agree with you on your assessment WRT evaluating potential used vehicles. Cheers.