idle battery capacity loss

The longest mine sat idle was three days and I didn’t notice any SOC % decrease.

 

It tops up the 12V battery from the traction battery for 20 minutes every 24 hours., but the current draw is negligible. I measured about 30mA avarage draw from the 12V battery once the car has gone to sleep.
Even once you account for the current used by the DC/DC converter doing the top-up, the loss of range will be minimal even after weeks.

 

Well, I will tell you in a week. My car is currently at 42% and the next time I'll be driving it will be in a week. So, stay tuned.

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I've had mine sit in the driveway for a week without any drop in displayed range. I would say the range drop variation during driving more than compensates for any apparent change after sitting for a week.

 

Given that each percent represents at least 640 Wh it makes some sense to use the GoM to measure the loss. You could leave it at 42.9% and have it drop to 42.0% on return, both reading 42%.

 

Ok, so I'm back.
Here is the info: 9 days without driving or anything, the GOM went down by 1 mile, the SOC stayed the same of course at 42%.

Here is something interesting though: just before I got home I tried to use bluelink. The car didn't respond and it usually always does in the spot where it was parked. I tried several times over a couple hours, but it still didn't respond. It works fine now, so maybe it went into some kind of deep sleep?

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Or Blue Link just sucks... as usual.

 

Could be, but it's usually working really good (although slow) for me.

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So, roughly 0.250 kWh ignoring the GoM's resolution. If that loss was used only for maintaining the 12V battery, subtracting 10% conversion losses, roughly 16 Ah at 14.4 V. For 9 days, assuming a charge once per day for 20 min, that's 5 A of charging current during each event.