Battery Range and FSD question

[That Beast Mode]

Tesla wants to know why you wanted to take over. Not just to improve mistakes of FSD, but to make it so that you don’t want to do that. I take over all the time when the road goes from 1-2 lane or to choose a better lane at a stop light. If FSD did this I wouldn’t want to disengage.
What happened?
Guy next to me in the Vet wants to race.

Yeah it didnt make any mistakes, I just wanted to drive. I wasn't sure if there was a "Proper" way to disable it vs it thinking there was a problem. You'd think the guy in the Vette would know better by now.

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[Gaximus]

Yeah it didnt make any mistakes, I just wanted to drive. I wasn't sure if there was a "Proper" way to disable it vs it thinking there was a problem. You'd think the guy in the Vette would know better by now.

Tapping the brake also disables, and so does turning the wheel, not sure about a prompt though. You can all close your eyes for like a minute and it’ll disable, which is the weirdest “safety” feature any company has ever made.

 

[Beetlebug62]

So for those of you out there that know the math on these things better than I do. Do you think there is an issue with my battery? I took the truck to my local SC today, it is 19mi each way. I left with 64% battery and returned with 47%. I drove there on chill mode, normal highway speeds 60-65, im not a lead foot. The truck was in service for about an hour just to factor that into the equation. To lose 17% charge over 38mi seems excessive to me. Based on my rough calculations it gives me a range of about 220mi. Shouldn't I be getting closer to 300mi with normal driving?

My next question, is there a "right" way to turn FSD off? I usually push the same button i use to turn it on. It gives me the pop up of FSD was deactivated, what happened? Nothing happened, I just wanted to take over. Just wondering if theres a proper way to deactivate it where it doesn't think something is wrong.

Thanks.

40mi at highway speed. My CT would be about ~400Wh/mi, so 2.5mi/kWh. That would be 16kWh used. You used 20kWh. So, 4kWh used in the shop. Don't know what happened there, doors open, heat or AC blasting? It's possible.

If you want to know what the BMS thinks your battery size is, do the math from the Energy Consumption screen. It doesn't matter which mileage you use, 10/100/200. Take the efficiency number multiply by the projected range and divide by your SOC. That will give you what the BMS thinks is your battery size: In my example below, take your 249.8Wh/mi times 244mi, gives you Wh. Divide by the SOC, 50%, gives you the battery size in Wh. In this case, 121,900Wh. Of course, there's margin of error, as you can imagine the 50% is rounded.

 

[ABILISK]

Thanks Abilisk, this is the kind of info and answer I was looking for - basically the math. Isn't 223 mi on a full charge pretty low? I don't know the actual range on a full charge because I've never charged it to 100%. When I get home I'm going to take a look at the energy tab and see. I haven't used the truck since the service yesterday so it should be the last trip data. Cabin overheat is definitely off, I do use sentry on park, away from home but as you mentioned I don't know if service mode disables that.

Cool let me know. That trip should be 550 Wh/mi (math doesn’t often lie), but then also look at your lifetime Wh/mi before getting too concerned. You can use the equation in my original post to get a real range number for you.

I’m going to guess the techs drained quite a bit of battery during the appointment. I drive my Beast faster than I probably should and my lifetime number is under 500. You’re most likely keeping yours in the high 300s if you use chill mode.

 

[mstatkus]

Range is going to change on a lot of outliers weather, load, driving habits, elevation.

 

[That Beast Mode]

I'll check the data when I get home and report back. Do you guys also find the range and charge to be accurate? Maybe its just me, but it seems like the truck will go from lets say 80% to 60% in no time, but then going from 40%-20% takes way longer with no change in driving habits. Again, I could just be imagining it.

 

[mongo]

I'll check the data when I get home and report back. Do you guys also find the range and charge to be accurate? Maybe its just me, but it seems like the truck will go from lets say 80% to 60% in no time, but then going from 40%-20% takes way longer with no change in driving habits. Again, I could just be imagining it.

Start of drive uses more energy for cabin temperature control. Later in drive, everything is steady state.

 

[That Beast Mode]

Ok so here's the data, I set it to show the last 100 miles since the last trip it had saved was only from the SC to home and not both ways. Can someone translate into English for me? I'm not great with interpreting it. It says my projected range is 209 miles.

 

[mongo]

Ok so here's the data, I set it to show the last 100 miles since the last trip it had saved was only from the SC to home and not both ways. Can someone translate into English for me? I'm not great with interpreting it. It says my projected range is 209 miles.

209 is range based on current charge level. You are averaging better than EPA estimates. At 382.8 Wh/mile a full pack would be 321 miles.
The drive and park tabs have more info too.

 

[That Beast Mode]

40mi at highway speed. My CT would be about ~400Wh/mi, so 2.5mi/kWh. That would be 16kWh used. You used 20kWh. So, 4kWh used in the shop. Don't know what happened there, doors open, heat or AC blasting? It's possible.

If you want to know what the BMS thinks your battery size is, do the math from the Energy Consumption screen. It doesn't matter which mileage you use, 10/100/200. Take the efficiency number multiply by the projected range and divide by your SOC. That will give you what the BMS thinks is your battery size: In my example below, take your 249.8Wh/mi times 244mi, gives you Wh. Divide by the SOC, 50%, gives you the battery size in Wh. In this case, 121,900Wh. Of course, there's margin of error, as you can imagine the 50% is rounded.

So doing the math as you showed, if I did it right I got 1230.8,
I took 382.8 x 209 % 65, the truck is currently charged at 65%. Did I do that right? And is that a good number?

 

[That Beast Mode]

209 is range based on current charge level. You are averaging better than EPA estimates. At 382.8 Wh/mile a full pack would be 321 miles.
The drive and park tabs have more info too.

Ah I see.. I thought that was the overall range it was calculating. Thanks

Here's the data from the last trip saved, which is from the SC to home only.

 

[ABILISK]

Looks like nothing to worry about. What’s your lifetime Wh/mi @That Beast Mode

 

[mongo]

So doing the math as you showed, if I did it right I got 1230.8,
I took 382.8 x 209 % 65, the truck is currently charged at 65%. Did I do that right? And is that a good number?

You shifted a decimal place
382.8*209/0.65 = 123,085 Wh = 123.08 kWh (expected pack size)

 

[That Beast Mode]

Looks like nothing to worry about. What’s your lifetime Wh/mi @That Beast Mode

Ok so everything is within range and seems normal to you?? The amount of drain for that SC drive seemed excessive to me and made me worry about it, but I really don't pay attention to the energy and drain all that much because like I said I don't really know how to interpret the data. I'm still fairly new to the EV world compared to others, I just know the battery is low, I charge it. Thank you for your help with it.

No idea - where do I find the lifetime Wh/mi info?

 

[That Beast Mode]

You shifted a decimal place
382.8*209/0.65 = 123,085 Wh = 123.08 kWh (expected pack size)

Yes, 65% is .65.. I was close lol. Ok so everything is running like normal and as expected. Thanks for the input, I appreciate it.

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