Why is my car pulling 26A at 100% charge?

pictsidhe

pictsidhe

Well-Known Member
I got home nearly five hours ago. We have a winter storm forecast, so I'm keeping it on charge while at home. It was fully charged over three hours ago. I was just out in the carport putting some crap away, and heard the EVSE click on. I hadn't opened th doors or unlocked it at that point. The car is pulling 26A, at 100% charge showing on the app and the dash. Temp is around 20°F. I can't hear the heat pump or anything else.

What is it doing?
 
pictsidhe said:
I got home nearly five hours ago. We have a winter storm forecast, so I'm keeping it on charge while at home. It was fully charged over three hours ago. I was just out in the carport putting some crap away, and heard the EVSE click on. I hadn't opened th doors or unlocked it at that point. The car is pulling 26A, at 100% charge showing on the app and the dash. Temp is around 20°F. I can't hear the heat pump or anything else.

What is it doing?
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That is bizarre! If the heat pump was running, would it pull that much current?

Be careful not to step in any puddles of electricity that may be leaking out from under the car :)
 
Probably your HV battery running a 12V battery top off cycle. In the i3 I remember it lasted like 1hr.

Most of the vehicle functions pull from the HV battery directly and the EVSE replenishes the lost SoC%.
 
26A is over 6kW. At 15V, that would be 400A. It's not putting 400A into the 12V battery. Over 20 minutes, it pulled 0.35kWh, then stopped pulling current. Nothing since. It was reading 26A maybe 30 seconds after it started pulling current.
 
Yeah it's not instantaneous for the HV battery recharging, but the accumulation of all loads over some period of time (12V battery recharging, 4G telematics, cell pack balancing...etc.) probably was just enough to trigger a 99% SoC on the HV battery.

As for the 12V battery, it There's a DC-DC converter for the HV battery to the 12V...well 14.1V system. I believe the F56 has a 50AH battery at 14.1V (i.e 0.705kWh) and something like 11.9V would be like less than 20% SoC on the low voltage battery.
 
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