Battery or Weather conditions?

[DNap4]

So, just came back home from a small trip to a christmas event and was wondering if this seems normal… 22’ XLT Lightning SR. Not towing anything. Two passengers. Interior cabin set to low speed auto climate to 72 degrees.

Plugged in and charged to 90% - 206 miles estimated
Departure time set at time we left, so battery was prewarmed

Trip to:
~68 miles
1.7mi/kwh
35 degrees with a negligible tailwind
Driving speed: 70mph
90% —> 49% battery

Return trip:
~72 miles (had to charge for safety)
1.4mi/kwh
23 degrees with an intermittent 10mph headwind
Driving Speed: 65-70mph
49% — > 45% (climatized for about 15mins before departing)
45% —> 36% battery in 4 miles.
36% Charged to 69% using DCFC
Returned back home with approx 23% battery left going 68 miles

Is this normal based on the conditions or should I get the battery checked?

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[PreservedSwine]

Normal. Slow down to 62 and you'll get much better kWh/mi

The truck is a flat out energy hog at interstate speeds, low temp or not. The temp and headwind simply exacerbated the low efficiency at that speed.

 

[RickLightning]

Normal. Next time charge to 100%, and set a departure time.

10mph headwind means you were driving 75-80mph effectively.

What does "climatized" mean?

 

[DNap4]

Normal. Next time charge to 100%, and set a departure time.

10mph headwind means you were driving 75-80mph effectively.

What does "climatized" mean?

I charged to 90% thinking I’d make 140miles roundtrip without having to use a DC. I also made sure to set a departure time before I left and the battery was already prewarmed.

Climatized means I used the app to set the vehicle climate before getting to the truck. It drained my battery from 49% - 45% over 15mins set at 72 degrees cabin on medium

 

[RickLightning]

No reason to not charge to 100% for the trip.

Heater can use close to 10kW. 15 min would be 3% on SR, then rounding.

 

[abcut973]

Nothing wrong with your battery just normal behavior with cold weather and highway speed.

 

[CD4TNF]

Normal. Last time I got 1.4 mi/kWh was a snow storm driving down a rural highway at 50 mph, 32F.

 

[Aminorjourney]

Unfortunately, that's to be expected.

You're losing some energy due to cabin heating with restive heaters (heat pump models will have less range drop). But you'll also get some reduced energy efficiency from the battery. Batteries are like us - they prefer it not too hot or too cold!

 

[Jseis]

I‘d set auto 1 bar in cabin to under 70, say 65 degrees F and drive 63-65. If no heated seats… Buy heated seat covers too. in our mild PNW 47-54 F in pouring rain and a headwind, I’ll occasionally go sub 2.0 at 53-54 mph. My two cents.

 

[DNap4]

Thanks for the advice all. Was kinda shocked at the range in the cold and thought I prepared at 90% not expecting that big of a drop… altogether went approx 140 miles and expended the entire 100% of the battery… If I had charged to 100% at the beginning, didn’t run my heater for 15 mins before getting in the truck nor stop to recharge 4 miles out, I probably could’ve done 136 miles in about 87% of the battery (I was afraid of getting stranded without a nearby charging station in about 30miles when I saw the battery % drop like a brick the first 4 miles.

on a side note. DC chargers were running at .56c / kWh up to .64c / kWh… The cost of just the recharging was very expensive when getting very low mi/kWh.

 

[fhteagle]

heat pump models will have less range drop

Has this had a proper side by side test yet? Site search turned up some people asking the question last year. But I could not find a thread with yes, we did a resistive vs heat pump side by side test.

'22 Lariat (ER) with resistive (and max tow 2nd chiller) in Western CO here. I'd rally up with someone within a reasonable distance to do time and energy to come out of cold soak, at speed efficiency, etc testing. A la what Out of Spec did with the model 3s.

December has been crazy mild here so far, but there should be an opportunity in January if we start looking at logistics now.

 

[JvdMaat]

I did a 170 mile round trip yesterday that also had odd results. I charged up to 100% before leaving, and got there after 85 miles with 68% battery left. (So assuming I had 131kWh for a full battery, that's 42kWh used, which is 2 mi/kWh (as opposed to the dash which stated 1.7mi/kWh)
Then the return trip took me down to 28% (40% usage as opposed to 32% for the way there). Which at 1.6mi/kWh at least matched the dashboard.
Outdoor temps went from 28 to 22 during the trip. So I guess that helped with higher usage on the return trip.

I'm personally thinking it charged to a little over 100% into the reserve capacity.
Also, I drove faster going out there than back (Around 5-10mph difference on a good chunk of the highway). So you'd think those numbers would be reversed..
Overall glad I bumped it to 100% before leaving. That same trip on Oct 3rd (Outdoor temp 66-69) took me from 100% to just over 50%. Temperature matters a lot.

 

[Aminorjourney]

Has this had a proper side by side test yet? Site search turned up some people asking the question last year. But I could not find a thread with yes, we did a resistive vs heat pump side by side test.

'22 Lariat (ER) with resistive (and max tow) in Western CO here. I'd rally up with someone within a reasonable distance to do time and energy to come out of cold soak, at speed efficiency, etc testing. A la what Out of Spec did with the model 3s.

December has been crazy mild here so far, but there should be an opportunity in January if we start looking at logistics now.

It’s a well-known benefit for of heat pumps. resistive heaters generate heat, but heat pumps only move heat energy from one place to another, meaning the only electricity they consume is the compressor.

 

[fhteagle]

It’s a well-known benefit for of heat pumps. resistive heaters generate heat, but heat pumps only move heat energy from one place to another, meaning the only electricity they consume is the compressor.

Thanks for the reply, but that doesn't answer my question.

Further, every heat pump will hit an input and output temperature combination where the COP drops to ~1. There are cases where it is possible to have a COP of less than 1 if there's too much heat leak on the hot side. Rare, and a design flaw if this it's occurring, but technically possible.

Not saying we're going to find the exact COP = 1 temp for the Lightning. But it would be nice to know if that's in the vicinity of 40F, 0F, -40F/C, etc ...

 

[MaintGrl]

I charged to 90% thinking I’d make 140miles roundtrip without having to use a DC. I also made sure to set a departure time before I left and the battery was already prewarmed.

Climatized means I used the app to set the vehicle climate before getting to the truck. It drained my battery from 49% - 45% over 15mins set at 72 degrees cabin on medium

Yes, I could see that happen! Climate Conditioning is a power hog.

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