GrantK
Well-Known Member
- First Name
- Grant
- Joined
- Jul 17, 2022
- Threads
- 5
- Messages
- 60
- Reaction score
- 46
- Location
- Santa Cruz
- Vehicles
- MME Select AWD
- Thread starter
- #1
Hi,
I think the efficiency number in the trips display is lying
[Edit] Note my question is not about range, it is about the reported efficiency. For range there will always be inaccuracy as you are predicting future events. For efficiency you are measuring past events (miles driven / kWh used).
For example I started with my (standard range) battery at 90% this morning and drove 62.1 miles at 3.5 mi/kWh according to the trip meter. At the end of the trip my battery was at 57%, so I used 33% of my battery.
My battery has about 5% degradation which I measured a few weeks back and 62 * 3 (33%) would give a total range of 186 miles which seems about right for a Select AWD in the relatively mild winter of the SF Bay Area.
So if I assume the claimed efficiency is correct then 62.1 mi / (3.5 mi/kWh) = 17.7 kW and if that is a 3rd of my battery that would make my battery size 53kW (while it should be in the high 60's after a bit of degradation?)
If I work with a battery size of 68kW (I got a couple of kW unlocked by the update, minus the degradation) then my trip this morning would be at about 2.7 mi/kWh which feels much more realistic.
I think the efficiency number in the trips display is lying
[Edit] Note my question is not about range, it is about the reported efficiency. For range there will always be inaccuracy as you are predicting future events. For efficiency you are measuring past events (miles driven / kWh used).
For example I started with my (standard range) battery at 90% this morning and drove 62.1 miles at 3.5 mi/kWh according to the trip meter. At the end of the trip my battery was at 57%, so I used 33% of my battery.
My battery has about 5% degradation which I measured a few weeks back and 62 * 3 (33%) would give a total range of 186 miles which seems about right for a Select AWD in the relatively mild winter of the SF Bay Area.
So if I assume the claimed efficiency is correct then 62.1 mi / (3.5 mi/kWh) = 17.7 kW and if that is a 3rd of my battery that would make my battery size 53kW (while it should be in the high 60's after a bit of degradation?)
If I work with a battery size of 68kW (I got a couple of kW unlocked by the update, minus the degradation) then my trip this morning would be at about 2.7 mi/kWh which feels much more realistic.
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