In theist moth or two I have been observing something I did not see (or notice) before, and I wonder what the possible side effects are.
The scenario is that I have an SOC < 20%, plug in sometime during the evening. Charging doesn't start until a schedule on my Wallbox Pulsar charger allows, at 2AM. I generally charge to 80-85% and it takes about 3-4 hrs (48A). When charging reaches the set level, charging stops, as expected. The car stays plugged in, but the charging schedule locks the charger, so the car cannot continue to take energy, even if the battery would go below the set level.
What I look at TeslaFi later in the day, but before driving I see the SOC % at the end of charging indicated as set, but then later I see the SOC go up by anything from 1-4%. If I don't drive, it doesn't come down at all (no sentry on while parked a home). I have no idea how the BMS computes SOC, but it clearly is not just based on the amount of kWh on board (as that could only go down).
I don't really care about getting a higher SOC, but I wonder what is going on here, and how this may possibly affect the degradation calculations in the charge summary. I mean if the SOC really was a few percentage points higher than indicated at the end of charging, I would think the projected full capacity ends up being under estimated (based on that) and consequently degradation seems higher than it really is. On the other hand, it may well be that the two are unrelated. None of this is a concern to me, but I am curious.
Customer support service by UserEcho