Mobile calculator for realistic/worst case range

[wholesome]

I have 22 ER MME, in NY, and it's my first winter with EV, so, of course, with colder weather and winter tires, range estimates started to be much more tricky.

After taking several trips with temps 15-30F I've realized that Ford's Guess-o-meter or Apple maps constantly overstate the range.

ABPR supposedly should be better, but for me, the free version was still way off in its range estimates, maybe the paid version is better, not sure.

GOM was especially bad: once with 14F temp, I had to find a random charger because I realized that I would not make it, while the initial range estimate was giving me plenty of slack, and then dropped like 30% or so while I was driving.

After that I made a small calculator that I run on my phone in the Excel app to see what would be the realistic/worst-case range, and so far, it works quite nicely for my needs, so I wanted to share, maybe it will help someone too.

So, basically, I use my own mi/kwh estimate and also show the worst-case range estimate, using 1.8 mi/kwh as a lower end.

So far, I found that for 30F temps, I tend to have around 2.2 mi/kwh, while GOM and Apple maps typically use around 2.4-2.5 mi/kwh as an initial estimate.
The worst case that I experienced was real-world ~2.0 mi/kwh with 15F temps, while GOM was using something much more optimistic.

You can also add distance in the calculator to see the arrival battery % and GOM/maps estimates - to see what mi/kWh they use (approximately). Also, I've added warmup loss that, with the cold car, could be up to 5%, in my experience.

If you use this excel, don't forget to change your battery capacity from 91 to what you need in the top right corner; it will not be visible on the phone screen initially.

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[hybrid2bev]

I find the free version of ABRP to be very accurate. Usually within a percent or two.

Curious if you added your vehicle and adjusted the ABRP settings, like miles per kWh at 65 mph and the max speed, temperature/wind settings?

I also used a spreadsheet to estimate my range but now that I have ABRP dialed in I just use that.

 

[Mach-Lee]

FYI the battery capacity will be less than 91 kWh. You lose some due to degradation, and you also lose some capacity when the battery is cold. For example, you might have 5% degradation and 20% capacity loss at 0°C:

91 x 0.95 x 0.8 =69 kWh usable x 1.8 mi/kWh = 124 miles

I also agree ABRP is pretty good at estimating range if you put in all the weather parameters accurately.

 

[wholesome]

In my experience, ABPR was fine when it was "typical" weather.

But if there is something additional like strong wind, fast temperature drop, snow/rain, it was not very accurate for me. But maybe I should tinker with it a bit more and it will be better. I assume the paid ABPR should be good.

In terms of battery degradation - yes, true, but since I don't know what degradation/loss to use I decided that I will just use a lower mi/kwh that I take from experience, but the correct way, I guess, would be to decrease the battery capacity and increase the estimated mi/kWh.

 

[superdave80]

So far, I found that for 30F temps, I tend to have around 2.2 mi/kwh, while GOM and Apple maps typically use around 2.4-2.5 mi/kwh as an initial estimate.

One thing that may be missed by ABRP and others is how much climate control power you use.

 

[wholesome]

Yeah, it is likely that, and also, winter tires, I think, also a factor.

For example, when I put all the movements today in ABPR as if it were morning, it shows that I should be at 44% at the end of the day. My calculator gives me 33%. In reality, it's 32%.

If I calibrate efficiency in ABPR then it should start predicting right, I guess.

 

[bkimball90]

I have a Premium with extended battery but when I charge to 90%, my estimated range is 200 miles. I don't think I even get that but the temps have been below freezing for a while. Not sure if 200 miles is normal for a 90% charge but it seems low to me.

 

[Rick65]

what about the Ford navigation system, if you enter a destination and start to move it will adjust your battery millage. I have never tested its accuracy, but curious about it now.

 

[wholesome]

I have a Premium with extended battery but when I charge to 90%, my estimated range is 200 miles. I don't think I even get that but the temps have been below freezing for a while. Not sure if 200 miles is normal for a 90% charge but it seems low to me.

Mine gives me about the same for 90%.
But the real world range is likely to be lower with freezing temperatures, at least, for me.

The worst case that I've experienced so far was when I charged 100%, the car was preconditioned and the car's estimated range was 245 or so. I had to drive 150 miles, and it took me 3 hours with traffic, it was windy and the temperature was dropping while I was driving. So when I arrived, I had around 20 miles remaining. So 75 miles just disappeared from the initial buffer of 95.

It’s not a problem for daily driving when you just charge overnight, but when you depend on chargers on the road trip, it quickly becomes important, especially if something is wrong with the charger that you were planning to use, and suddenly you have a much lower buffer than planned.

 

[wholesome]

what about the Ford navigation system, if you enter a destination and start to move it will adjust your battery millage. I have never tested its accuracy, but curious about it now.

I never tried it, Apple maps (or google maps with android as I heard) does the same when connected to car play.

I wish Google Maps would do it on iPhones

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