DaveinOlyWA wrote: cwerdna wrote:
jbuntz wrote:I think I can tell you what not to do to keep your 30kwh battery healthy.
I bought a 2016 SL last 12/2016 that was built in 11/2015. Almost as soon as I drove it home I was wondering about battery capacity. A week later I got leaf spy and it showed AHr=68.93, SOH=86% Hx=83.96% 2QCs & 27 L1/L2
I know it sat on a lot in Texas for a year and I bet they charged it to 100% after every test drive.
As of today it has recovered a little AHr=71.21 SOH=89% Hx=86.18%. The best I have seen on a full charge is 25.7kWh.
That sucks but I wouldn't bother w/the Leaf Spy kWh values. I bet what you're looking at is just based off of # of gids * (whatever the Wh/gids setting is set to). The default for that is 77.5, IIRC.
I posted about this at viewtopic.php?p=476092#p476092
so what should it be? 75?
You tell me. I'll say it again and try to expand more.
We have no idea if ANY constant value is correct for mapping kWh in the pack vs. gids. For all we know, it's vestigial code in their firmware that was used from some internal testing that they no longer use.
We have no idea if it's only accurate for certain ranges of gid values (e.g. not correct near the top and/or bottom). I seem to recall some people posting that near the bottom some gids lasted longer than others. When the pack is near full and charging rate is below say 4 kW, it seems like the gid value doesn't move up much. We have no idea if there actually need to be multiple constants depending on what the gid value is. (e.g. value A for gid range ___ to ___, value B for gid range ___ to ___ and so on).
We have no idea if there are certain conditions that need to be met for it to be accurate (e.g. certain pack condition or temperature, after certain things have happened, after a certain rest period, only accurate on a new pack, only accurate on a pack degraded no more than ____, only accurate if drained down to _____ and filled to ____, etc.) These are are hypothetical. We have no idea of the gid count's accuracy.
Unless Nissan can officially provide us such info, I think it's basically useless data to assert one's pack has ____ kWh capacity per Leaf Spy and useless to try to compare kWh numbers from Leaf Spy vs. values from L2 charging stations (w/stats) or CHAdeMO chargers. An alternative is to do some test where Leaf Spy's kWh number is compared vs. charging the battery fully and discharging the battery until dead, using something else to count the kWh that came out of the battery. But, that may not work if there are other conditions/caveats we don't know about.
Just use gids by themselves. Forget trying to derive w/accuracy how much is in the battery from it.