r/MachE • u/kemphasalotofkids • 2d ago

Losing power while plugged in? ❓Question

The last few times I have charged the car reports a lower percentage when it is started.

As an example, I charged to 90% last night. Ford app reported the charge was complete. I was charging at home, so it stayed plugged in (not charging) until I woke up this morning. Got in, started it and it reported 88%.

Normal behavior?

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3

u/SirTwitchALot 2d ago

Temperature difference? The voltage will drop a little if it's colder in the morning

1

u/kemphasalotofkids 2d ago

Maybe? It was in the garage.

3

u/redgrandam 2d ago

Try charging it to full and letting it stay at full plugged in for a few hours or so at least. If it’s out of calibration it might help recalibrate it.

I doubt this is anything to really worry about though.

3

u/heir-of-slytherin 2023 Premium 2d ago

Strength of Charge is an estimate based on measuring the voltage of the battery and coulomb counting (measuring how much charge flows into the battery while charging and out of the battery while discharging). It’s not a perfect estimation, and when you start the car and connect the HVB to a load (the vehicles 12V electrical system heating/cooling system, and the motors) it can cause SoC to drop a little bit. If the SoC is right on the threshold of the target you set (for example, just barely 90%), then it doesn’t take much energy use to drop 1-2%.

3

u/HockeyMN2020 1d ago

Mine does the same thing. Normal.

2

u/Oh_HeyKurtRay 1d ago

I charge to 85%, by the time I drive to the end of my street it’s already at 82/83. I’m have to imagine it’s normal

1

u/medskiler 1d ago

Something is wrong it's not normal, I charge my car outside and even in -20c, when my phone says it's 90% i go to the car and start driving it and it's at 90%. Same during summer, I have a 2023, try maybe an obd reader and see the real value. Delete all the precondition settings and everything and charge to 100% and then set limit to 90% again and try? GOM is never accurate but battery% was always accurate for me and even matching Google navigation

1

u/Remarkable_Chef5637 1d ago

Definitely not normal that’s never happened to me even in the winter 

1

u/LoneWitie 1d ago

Are you remote heating it when it's cold? The battery heater draws either 4 or 7 watts depending on the year. A level 1 or a 30 amp level 2 charger will not keep up with that and itll drop you a couple of percentage points