Cold weather driving

[Stuieb]

I'm paying closer attention to my miles per charge now that it's cold out. After a full charge I drove 1 short round trip and both trips had efficiencies in the 90+% range in the current trip. When I looked at the total in the trip 1 that I reset before charging, it was in the 40% range. How did this make sense? Thanks!

Sponsored

 

[tedjordan]

Not sure I totally understand what you're asking but for my 430 mile trip from Milwaukee to Detroit in 70 degree weather, I only need to juice once, and will have plenty left over.
At 20 degrees I need to charge to 90% twice! It's terrible because fast chargers slow down at 80% and sometimes at 70%. Each stop is an hour ?

 

[RickMachE]

No idea what OP is asking.

 

[Stuieb]

On the energy screen I'm at 80 to 98% efficient per drive yet half that total since last charge. I hope that makes more sense. Thanks.

 

[Stuieb]

On the energy screen I'm at 80 to 98% efficient per drive yet half that total since last charge. I hope that makes more sense. Thanks.

 

[RickMachE]

On the energy screen I'm at 80 to 98% efficient per drive yet half that total since last charge. I hope that makes more sense. Thanks.

Still makes no sense.

Efficiency has no relationship to charging. Efficiency is tied to temperature, whether you use HVAC, how you drive. So, if you precondition the battery with a departure time, don't use the heater much, and drive at 45mph for 15 minutes, you will get much different efficiency than if you start with an ice cold battery, drive 45mph for 15 minutes, stop, run errand, get back in and do the reverse.

Hope that helps. I never look at that screen.

 

[Stuieb]

Still makes no sense.

Efficiency has no relationship to charging. Efficiency is tied to temperature, whether you use HVAC, how you drive. So, if you precondition the battery with a departure time, don't use the heater much, and drive at 45mph for 15 minutes, you will get much different efficiency than if you start with an ice cold battery, drive 45mph for 15 minutes, stop, run errand, get back in and do the reverse.

Hope that helps. I never look at that screen.

Yes, very helpful. Thanks so much.

 

[Stuieb]

Hopefully this helps understand. 2 pictures. One that shows a single drive. The other a cumulative of all drives since the last full charge. Huge difference. Lost 100 miles of charge on 50 miles of drive. Concerned there may be something wrong with the battery. Thanks again.

 

[TruWrecks]

Hopefully this helps understand. 2 pictures. One that shows a single drive. The other a cumulative of all drives since the last full charge. Huge difference. Lost 100 miles of charge on 50 miles of drive. Concerned there may be something wrong with the battery. Thanks again.

With Climate Use at 37% there is nothing wrong with your battery. It is called, cold weather and rain effect efficiency more than you think. The heater in the MME uses a lot of power. Rain and standing water add rolling resistance.

Myth - Lithium batteries lose capacity in the cold.

Lithium batteries do not lose any capacity in the cold. They become less efficient transferring that power as the temperature drops.

This topic comes up every winter with new EV owners. Enjoy your car and don't get hung up on this.

If you really want to get more during winter driving you can recover a few kw changing habits. Use the seat heaters instead of the cabin heater if you want to stretch a few more miles out of the charge. Don't route to chargers using the built in navigation if you want to get more mileage. It takes a surprising amount of power to precondition the battery for DC charging. The downside is that DC charging will take longer without preconditioning. It is a trade-off.

 

[Mach-Lee]

With Climate Use at 37% there is nothing wrong with your battery. It is called, cold weather and rain effect efficiency more than you think. The heater in the MME uses a lot of power. Rain and standing water add rolling resistance.

Myth - Lithium batteries lose capacity in the cold.

Lithium batteries do not lose any capacity in the cold. They become less efficient transferring that power as the temperature drops.

This topic comes up every winter with new EV owners. Enjoy your car and don't get hung up on this.

If you really want to get more during winter driving you can recover a few kw changing habits. Use the seat heaters instead of the cabin heater if you want to stretch a few more miles out of the charge. Don't route to chargers using the built in navigation if you want to get more mileage. It takes a surprising amount of power to precondition the battery for DC charging. The downside is that DC charging will take longer without preconditioning. It is a trade-off.

Lithium batteries DO lose capacity in the cold, but it’s reversible by warming the battery back up. This is why setting a departure time to warm up the battery will increase range. It’s the combination of both cold battery capacity loss and increased consumption that causes winter range loss.

OP, looks like there’s a glitch in your trip 1 data screen, I wouldn’t read too much into it. Just use a departure time if you’re worried about range.

1.9 mi/kWh is normal for 28°F especially if your are driving really slow <30 MPH after a cold start.

 

[Stuieb]

Lithium batteries DO lose capacity in the cold, but it’s reversible by warming the battery back up. This is why setting a departure time to warm up the battery will increase range. It’s the combination of both cold battery capacity loss and increased consumption that causes winter range loss.

OP, looks like there’s a glitch in your trip 1 data screen, I wouldn’t read too much into it. Just use a departure time if you’re worried about range.

1.9 mi/kWh is normal for 28°F especially if your are driving really slow <30 MPH after a cold start.

Thanks. I figured there has to be some kind of glitch there. Math was not mathing.

 

[alexgorod]

Sometimes "This Trip" miles are not getting reset so it doesn't start from the zero, and it results into incorrect (too optimistic) efficiency.

Sponsored