bajadahl
Well-Known Member
- First Name
- Alan
- Joined
- Apr 10, 2020
- Threads
- 16
- Messages
- 385
- Reaction score
- 981
- Location
- Austin, TX
- Vehicles
- Lexus LX470
- Occupation
- IT
- Thread starter
- #1
I want to talk about range again while my Grand Canyon trip is fresh in my mind. I am trying to keep it simple for those of us who have never owned a bev. All this talk about charging rates, curves and C rating makes my head spin..... I realize this is all conjecture at this point but if we take the info Rivian has shared we can extrapolate some possibilities.
Let's say I am a cautious type - I intend to keep my battery for the most part between 10% and 80% which means I am going to lop off 30% of the rated range. Some of this is due to potential charging curve and some is trying to care for thee battery. Anyway if I take that approach then I can calculate the large battery at 300 * 70% = 210 miles or the Max Battery 400 * 70% = 280 miles.
Now for the miles that I actually drive I know that I am not always going to get the "rated range" for that remaining 70%. In fact it could be argued that I will never get the actual rated ranged. So I am trying to come up with a target for that 70% that I will actually get to use.
If I lop off another 15% (of the 70% usable) then my actual highway driving range becomes
Large Pack 210 * 85% = 178.5 miles
Max Pack 280 * 85% = 238 miles
Now Rivian claims we can add 140 miles of range in 20 minutes DCFC (I'm strictly talking highway DCFC here) I realize there will be some as of yet unknown curve applied which means the charge rate isn't linear. But as a guess I will argue that 30 minutes get's me close to 200 miles of range and 40 minutes might get me close to the 238 miles that the Max pack "offers"
I also understand that the Nav system will try to do all of these calculations for me... but I like planning road trips in advance with very specific stops... I don't care that you have to pee... put a knot in it until our scheduled stop.....
Seriously - are my assumptions reasonable... even conservative maybe? Can I almost aways count on 238 miles of range in that 70% of the Max pack. I know the weather conditions, road conditions, and speed matter. Would you be happy with these range estimates? I am hoping that the 15% loss accounts for highway driving at between 75-80 like most interstates out west allow.
Let's say I am a cautious type - I intend to keep my battery for the most part between 10% and 80% which means I am going to lop off 30% of the rated range. Some of this is due to potential charging curve and some is trying to care for thee battery. Anyway if I take that approach then I can calculate the large battery at 300 * 70% = 210 miles or the Max Battery 400 * 70% = 280 miles.
Now for the miles that I actually drive I know that I am not always going to get the "rated range" for that remaining 70%. In fact it could be argued that I will never get the actual rated ranged. So I am trying to come up with a target for that 70% that I will actually get to use.
If I lop off another 15% (of the 70% usable) then my actual highway driving range becomes
Large Pack 210 * 85% = 178.5 miles
Max Pack 280 * 85% = 238 miles
Now Rivian claims we can add 140 miles of range in 20 minutes DCFC (I'm strictly talking highway DCFC here) I realize there will be some as of yet unknown curve applied which means the charge rate isn't linear. But as a guess I will argue that 30 minutes get's me close to 200 miles of range and 40 minutes might get me close to the 238 miles that the Max pack "offers"
I also understand that the Nav system will try to do all of these calculations for me... but I like planning road trips in advance with very specific stops... I don't care that you have to pee... put a knot in it until our scheduled stop.....
Seriously - are my assumptions reasonable... even conservative maybe? Can I almost aways count on 238 miles of range in that 70% of the Max pack. I know the weather conditions, road conditions, and speed matter. Would you be happy with these range estimates? I am hoping that the 15% loss accounts for highway driving at between 75-80 like most interstates out west allow.
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