silverone wrote:I was surprised I didn't see much discussion about these swings or the effect of cold ambient temperature, because they'd be critical in evaluating a used car for someone in a cold climate. Battery temperatures didn't swing as wildly or seem to have as much of an effect.
I have Leaf Spy running on a spare phone almost all the time and logging to Dropbox. Although these are my max/min readings over a timeframe, none are really outliers from the surrounding data. It seems to take about 3 days for readings to stabilize after a big ambient temperature swing.
I've also seen GIDs at 100% charge swing accordingly from 259 to 284 over the same timeframe, although they seem to max out at 284 for any AHr reading above the high 65 range.
Based on the way the data is trending for my car, I may have a low enough AHr reading by mid summer to lose a bar after showing 103+ Hx at times in the winter! Perhaps if things continue I'll make and publish a trend of the data.
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).