JLB2 wrote:My home charger (Chargepoint) gives me the amount of KWH's that was transferred to my i3 during a charging session.
That's not the energy actually used to charge the battery pack due to some of the energy being converted to waste heat during charging. The Idaho National Labs measured a 2014 i3's charging efficiency at various charging powers. The most efficient charging, 93%, was 30 A @ 240 V. Lower charging powers were less efficient.
Whereas, Batt. Kapa. max is the calculated maximum energy that could be added to the battery pack (i.e., excluding wasted energy).
So to make these equivalent, you'd need to correct the Chargepoint energy for energy lost to heat (i.e., at least 7% less than Chargepoint reports).
Just an observation: had to charge at a public charging station today, paid for 9.7 kWh. I took readouts of Batt.Ladung from the hidden menu before and after the session to measure charging losses:
Before: 19% SOC, Batt.Ladung 3.1 kWh (implied battery capacity = 16.3 kWh), Batt.Kapa 16.9 kWh, ambient temperature +1.5C / 35F
After: 69.5% SOC, Batt.Ladung 12.8 kWh (implied battery capacity = 18.4 kWh), Batt.Kapa 17.0 kWh, ambient temperature +1.5C / 35F
Seems the session was effectively lossless - 9,7 kWh metered - 9.7 kWh added to Batt.Ladung. Also, the post-session implied battery capacity didn't translate into significantly higher Batt.Kapa value, as I would have expected. And, if we divide 9.7 kWh by the depth of charge (9.7 / 50.5%), we get one more implied battery capacity value, this time 19.2 kWh. Go wonder...
(for those, who may be interested, the screenshots are under this link: https://www.drive2.ru/l/524031640918296811/