Charging Issues

[Kamuelaflyer]

"where do ter is something significant you below 58 F" ?

iPhone typing. This particular 12 pro max has a penchant for doing very very odd things. Corrected.

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[generaltso]

It's a little frustrating/annoying that I'm leaving my house with 75% charge instead of 90% despite it sitting in my garage, plugged in all night.

Are you saying that you charge to 90% overnight and then when you unplug in the morning the car says it’s at 75% state of charge? That’s an entirely different problem than what you initially described and isn’t normal behavior.

 

[JohnnyForensic]

Awesome thank you.

It's just with an ICE vehicle, even if the MPG decreases significantly during colder months, I'm still leaving the gas station with a full tank of gas.

It's a little frustrating/annoying that I'm leaving my house with 75% charge instead of 90% despite it sitting in my garage, plugged in all night.

Are you using the preconditioning settings? Instead of remote starting (which I’m guessing you’re doing shortly before you leave), preconditioning settings on the timer will take care of this about 15-20 minutes beforehand, which also gives some time for the charge to catch-up with what’s being used to precondition (especially if you’re on L2 and not L1). Both run off the battery to do it, but the length of time that preconditioning runs is probably longer than what you’re doing with a remote start, and my guess is that the battery isn’t catching back up to a full 90% from when you leave. Still, shouldn’t be leaving with 75% charge. I’d check to see if your charge window accidentally set itself to something short or unreasonable and open it up. I had that happen once to me when “recommended charge times” suddenly came down in FordPass from my utility provider, even though we don’t have time of service billing.

 

[RickMachE]

Are you saying that you charge to 90% overnight and then when you unplug in the morning the car says it’s at 75% state of charge? That’s an entirely different problem than what you initially described and isn’t normal behavior.

No, because he shows a picture with 89% and 155 miles.

 

[JohnnyForensic]

Also, the 90% dropping to 89% may in fact not be loss, but "rounding". I sometimes see this change when I back out of my garage, and I haven't used 1%.

In addition to rounding, I’ve found this is also an artifact of when preconditioning stops vs. how long the charge is running. For example, if I pull the plug in the middle of preconditioning, the charge hasn’t completely kept up with the preconditioning process, and 90% rolls to 89% really quickly. If preconditioning is complete and I’m a few minutes late getting out, the charge has replenished back to the “full” 90%, and it takes a while before I see the drop to 89%. This is similar to leaving it plugged in for a 90% charge and then taking it out in the middle of the day without the preconditioning process. If it’s not particularly cold, that 90 to 89% roll-down happens slower than if I caught it in the middle of a preconditioning cycle.

 

[RickMachE]

The OP is saying that at 90% charge he used to get a displayed range of 190 miles, and now gets 155 miles, a reduction of 18.4%. He's in Massachusetts, it's now cold, and this is due to the GOM sensing the colder weather, nothing more. He shows how it's accurate saying he then drove 19 miles, and the range is 136 miles, 81% 155 - 19 = 136.

At 100%, that 155 would turn into 172 at 10)%, with his Select AWD.

 

[generaltso]

The OP is saying that at 90% charge he used to get a displayed range of 190 miles, and now gets 155 miles, a reduction of 18.4%. He's in Massachusetts, it's now cold, and this is due to the GOM sensing the colder weather, nothing more. He shows how it's accurate saying he then drove 19 miles, and the range is 136 miles, 81% 155 - 19 = 136.

At 100%, that 155 would turn into 172 at 10)%, with his Select AWD.

I get that. But then I don't understand this comparison with an ICE car leaving the gas station with a full tank of gas.

It's just with an ICE vehicle, even if the MPG decreases significantly during colder months, I'm still leaving the gas station with a full tank of gas.

It's a little frustrating/annoying that I'm leaving my house with 75% charge instead of 90% despite it sitting in my garage, plugged in all night.

 

[RickMachE]

I get that. But then I don't understand this comment about an ICE car leaving the gas station with a full tank.

A lack of understanding. His battery is still at 90%. His RANGE is predicted to be less due to the cold. Identical to an ICE vehicle with a tank at 90 or 100% full, but it's now cold and it has winter gas. A 20% drop in performance for an ICE vehicle in winter is totally normal also. Same level in the tank, less MPG.

 

[oleosmirf]

A lack of understanding. His battery is still at 90%. His RANGE is predicted to be less due to the cold. Identical to an ICE vehicle with a tank at 90 or 100% full, but it's now cold and it has winter gas. A 20% drop in performance for an ICE vehicle in winter is totally normal also. Same level in the tank, less MPG.

Exactly, basically the reduction in range is merely the MME predicting that based on the cold, I can only get 155 miles instead of the 190 I got before.

 

[RickMachE]

Exactly, basically the reduction in range is merely the MME predicting that based on the cold, I can only get 155 miles instead of the 190 I got before.

Right.

Your ICE vehicle doesn't take into account things like temperature. It looks at your driving history, and predicts the future. So if you drive in the city and get 15mpg, then it predicts based on that x your tank (assuming you drive a few 100 miles). If you drive on the highway and get 30 mpg, it predicts on that.

The EV uses things like temperature and altitude, as well as history, to predict in advance. It assumes the worst, and then you go an prewarm the vehicle on house current, or use less heat than it thinks you will.

As stated often, the best predictor is to drive in the conditions and note your miles per kwh, then do the math for the future.

 

[Kamuelaflyer]

Exactly, basically the reduction in range is merely the MME predicting that based on the cold, I can only get 155 miles instead of the 190 I got before.

You might still exceed the GOM estimated range, but your winter range will definitely be lower than late spring and summer range.

 

[RickMachE]

I'm waiting to see, with interest, how range is truly affected in colder temps, absent running the heat, if the vehicle is preconditioned. When we take our first trip in colder weather, I will intentionally not use the heat for a period to note the miles per kwh we are getting.

We did a 2,400 mile round trip (plus local driving) back at the beginning of September, and got 2.9 overall with the AC running. An end of month / October trip yielded 3.4 without AC, although different terrain. I'm hoping for at least 2.25 on the highway in the winter, which will yield a range of 139 miles going between 80% and 10% on the 88kw battery. If they up it to 91 as expected, and let us charge to 90%, that jumps to 164, a gain of 24 miles or 18%. That's could add up to one less stop on a long drive.

 

[Mach-e4x]

I charge to 85% in my garage - Today after driving to work my car started giving me a message that the outside temperature is too low, 27 degrees, and that I should plug in. I drove 5 miles with E heat on, the charge was at 83% when I arrived.
I'll see how much is left when I go home today.

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