Our MAX PACK R1T's decent first winter trip across WI

[mikef]

Your post talking about you trying to determine whether you could make it all the way or not without charging reminded me two weeks ago I was driving home from a trip and I was in the situation where the navigation was telling me to stop and fast charge while the energy screen showed I definitely had enough miles to reach home, and I hand-estimated I'd make it home with 30 miles of range, so I was unsure of what was what, because I'd rather arrive home with 10% battery than to stop and charge, but I'd most of all prefer to not strand myself a few miles from home.

Since then I figured out that the energy screen is showing the range mostly based on the EPA efficiency number (which for me is ~2.65 mi/kWhr) * the percent battery.

When you navigate to a destination the estimated arrival range is based on the actual conditions (15 min ave)--but then estimated arrival mile range number is going to be the percent battery at arrival * the EPA efficiency number.

(Lately since it's gotten cold here in the Midwest, I've been getting 1.9-2.2 mi/kWhr going 75 mph on the interstate depending on wind and temp conditions, so the range on the energy screen is very optimistic and will be a lot higher than reality.)

So basically, when you start your trip, the energy screen will say something like you have 300 miles of range while the navigation will say your trip is 180 miles and you will arrive with 40 miles of range. 180 + 40 = 220 miles which is a lot less than 300. As you make your journey the energy screen will converge to the navigation arrival miles and become the same as you arrive. This means the energy screen range miles will decrease faster than 1 mile per mile driven.

But this is winter and I'm driving 75+ mph on the interstate. The EPA test conditions could be like 55 mph or even a composite of conditions including city driving. Today I was driving in town with minimal heating and my 15-min average was over 3.0 mi/kWhr.

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[Gandy14]

The funny part is that I heard from OutofSpec reviews the Large and Max pack are identical and just have software differences. Wonder if my Large can be upgraded. Original order was for a Max pack. My once a month long range ride is 359mi one way utilizing Conserve on the interstates. I always have to stop and charge approx 1/2 way to make it with a bit in the battery. Just a Lil more please Rivian. Although since the last update battery efficiency has gotten better.

I think they said it was just "Battery Chemistry" differences between Large and Max

 

[CrazyOne]

You drove slightly slower than normal traffic. Most traffic moves 5 mph above speed limit and lot of them are doing close to 10. That definitely helped range.

 

[Budman]

Your post talking about you trying to determine whether you could make it all the way or not without charging reminded me two weeks ago I was driving home from a trip and I was in the situation where the navigation was telling me to stop and fast charge while the energy screen showed I definitely had enough miles to reach home, and I hand-estimated I'd make it home with 30 miles of range, so I was unsure of what was what, because I'd rather arrive home with 10% battery than to stop and charge, but I'd most of all prefer to not strand myself a few miles from home.

Since then I figured out that the energy screen is showing the range mostly based on the EPA efficiency number (which for me is ~2.65 mi/kWhr) * the percent battery.

When you navigate to a destination the estimated arrival range is based on the actual conditions (15 min ave)--but then estimated arrival mile range number is going to be the percent battery at arrival * the EPA efficiency number.

(Lately since it's gotten cold here in the Midwest, I've been getting 1.9-2.2 mi/kWhr going 75 mph on the interstate depending on wind and temp conditions, so the range on the energy screen is very optimistic and will be a lot higher than reality.)

So basically, when you start your trip, the energy screen will say something like you have 300 miles of range while the navigation will say your trip is 180 miles and you will arrive with 40 miles of range. 180 + 40 = 220 miles which is a lot less than 300. As you make your journey the energy screen will converge to the navigation arrival miles and become the same as you arrive. This means the energy screen range miles will decrease faster than 1 mile per mile driven.

But this is winter and I'm driving 75+ mph on the interstate. The EPA test conditions could be like 55 mph or even a composite of conditions including city driving. Today I was driving in town with minimal heating and my 15-min average was over 3.0 mi/kWhr.

As you pointed out, the two range estimates are different and do tend to converge. And like you I often rely on my own calculations. To make the mental math easier I assume the battery is 100 kWh and not 128. Then if if the percent battery graphs shows 65% remaining then I figure I have 65 kWh I can use and the 28 kWh I neglected is generous safety buffer. Then I take that 65 kWh number and multiply it by the 15 minute moving average efficiency number the drivers screen displays. That's range estimate I really rely on, the others are a backup to check my mental math.

 

[mkhuffman]

From what I've seen, the Max pack has ~149 kWh or 2.75 miles/kw. You got ~2.40 in cold weather...that is excellent. Thanks for sharing.

FYI - the usable capacity of the Max Pack is 142 kWh.

 

[Supratachophobia]

I think they said it was just "Battery Chemistry" differences between Large and Max

Specificly the 5400 mah 21700 Samsung cell compared to the 5000mah cell I think.

 

[mmassie]

Awesome! Should be even easier this Spring when we can use Tesla Superchargers. We're making a run this Spring north from Milwaukee to the Boundary Waters and it will definitely induce range anxiety once we get into the NE Minnesota arrowhead.

 

[Robin]

I still don't understand how you are not receiving cold air blowing through the vents when it is set at 69 degrees (regardless of preheating, using auto, or setting fan manually).
There are many threads on the HVAC system and that somewhere between 71-73 is the point where people have to set to get heat. Anything below is AC (notice the snowflake vs heat symbol when toggling between 71 and 72). If yours shows the heat symbol below this point that would be the first I have heard.

Reference the following threads:
https://www.rivianforums.com/forum/threads/normal-hvac-behavior.12699/
https://www.rivianforums.com/forum/...oes-not-use-external-temp-as-reference.13617/

i have to go towards 80 degrees before i get heat and then lower it down to roughly 74ish to be comfortable, if i go lower then I have cold air blasting in. I‘ve learned to live with this. 14k miles since March this year.

 

[SlaterGS]

you're missing something. It heats the vehicle up either way. The issue is how they present the graphic for that.

You are welcome to come sit in my car and try it out to prove me wrong (you won’t)
12k miles like this, and I’m not the only one that is having this issue as shown in the threads that I referenced and many others with a quick search.
learned to deal with it, just a poor implementation that I hope gets fixed in a OTA update

 

[SeaGeo]

You are welcome to come sit in my car and try it out to prove me wrong (you won’t)
12k miles like this, and I’m not the only one that is having this issue as shown in the threads that I referenced and many others with a quick search.
learned to deal with it, just a poor implementation that I hope gets fixed in a OTA update

Just telling you the intended behavior based on a comment response from Wassym and how both of my vehicles from them work. If it doesn't warm for you ever if your temp is set below 70 something, go submit a service ticket.

 

[Count Orlok]

not just NE WI but SW and NW are poorly served. We all need to move to Michigan.

 

[emoore]

i have to go towards 80 degrees before i get heat and then lower it down to roughly 74ish to be comfortable, if i go lower then I have cold air blasting in. I‘ve learned to live with this. 14k miles since March this year.

How long have you waited for it to change temp? I typically have my temp set at 69 and it will blow cold air at first but in a minute or two it will be hot air. Now I just start the hvac before I get in the truck and it's blowing hot air by the time I get in.

 

[Cascadian]

Go to ABRP app and set the SOC to 5%. It will do the trick of not recommended you to stop and charge

You can set arrival SOC in the Rivian nav too

 

[LL75]

You can set arrival SOC in the Rivian nav too

That's awesome. Couldn't done that about 6 months ago

 

[Epicloop]

I was thrilled to see the original estimation becoming untrue.

I arrived at my destination with 90 miles and 22%.

The return trip home the following day with 100%, the nav system made the same recommendation and I drove past the recommended stop arriving home with 90 miles and 22% reserve.

Thanks for the report, any idea of the ratio of 55 limit to 70 limit?
90miles/22% extrapolated is 409 miles pretty decent considering the conditions. Looks like you could pretty safely make it a the speed limit.

268 + 90 = 358mi expected range in those conditions, maybe more since the computer is underestimating? Not too shabby!

409 x .22= 90 miles pretty dang close to epa, not bad.

13 % drop in range at 23F ? Seems to be better than predicted.

Especially considering the remaining 90mi/22% = 409mi. Is this based on the last 15mi driven?

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