I am trying to see if anyone has answers as far as Useable battery capacity vs. stated capacity and possible reserve or re-indexing the perceived battery capacity.
I now have 153 charges logged on teslfi and 367 drives.
I have a Nov 2015 Model S 90D with 61,000 miles on it. I drive on "Range Mode" all the time with interior temp set to 19c in the winter with no heating for comfort and 22c in the summer.
I have run down to 1% and 0% rolling into charging stations based upon Tesla navigation calculations and trying to reach the suggested and navigated charging station, but never died. I have found on my last road trip that the Tesla nav ap would not consider an alternate charging station (if one was available before the point of no return) until I had gotten down to arrival at 2% or lower.
SUGGESTION FOR TESLA- I would love to have Tesla incorporate a thresh hold setting that you can set a reserve preference in the nav setting to ensure you arrive with reserve (0-15%). Basically redirect me to a closer charger if I cannot arrive with the preset threshold at the navigation Ap designated charger. Leave me some more range before you redirect at the point of no return.
I drove this last trip for 30 miles with the "Do not exceed 50mph to make your destination" before the Tesla app decided to redirect me to a charging station I was about to pass in 2 miles when the "arrive with" dipped to 2%. I intervened on 5 occasions where I would have been stranded or driving at 50mph in a 75 and 70mph zone attempting to hypemile to the next charger. I decided to interrupt the trip and charge, and was met with a "charge for 15 minutes to continue your journey" to the charging station I was directed I would make it to based upon my last charge and past 800 miles of recorded and trended driving. Basically I stopped before directed to do so, and was directed to charge for 15 minutes to make it to the previously designated charger...So I would have been stranded or doing 40mph in the right lane to make it?
Charging 0-1% - 100%
74.7-74.9 Kw @ 100% efficiency supercharging or 85% efficiency home charger
Driving - utilized Kw
220.127.116.11 Kw 100% - 0-1%
So I have recorded a half dozen charges from 0-1% upto 100% to see how much I actually charged the battery, the answer 74.7 - 74.9 Kw
Accordingly when I view the trip meter I expended exactly the same amount between charging on an uninterrupted road trip.
I drive 100+ miles daily on the highway, flat one way 50 miles at 70-80mph, returning in rush hour at 35mph in the middle 1/3 of the time with the first and last 1/3 of the trip at 65mph.
I utilize the cruise control all the time. I avg 330 w/mile and at 75Kw capacity that equates out to calculated 227 miles, but I am actually getting ~190 miles tops. This summer with everything off I consumed 75 kw and traveled 210 miles New record for distances, I avg 290w/mile.
So my question. What is the overprovisioning of the battery, or is there a limit of useable capacity? I am seeing a 17% capacity gap between my stated battery capacity and what I can charge and use. Yes i understand there are parasitic losses while driving, but if I charge at 100% efficiency from 0-100% and only charge on board 74.9Kw (supercharging and home charging - although at 85% efficiency) and my use shows exactly the same expended as charged, they where is the missing 15kw?
I would need to get my consumption down to 277 kw/mile to get 270 miles out of my 75KW of available battery. Do I need to run my battery flat (a bad thing for LiOn batts) in order to get a new reference level so the system algorithm "knows" the actual capacity of my battery?
I asked a home visit tech to run a remote battery test and he provided me all he was "authorized" to tell me...My battery was performing and had capacity "in family" with Model S 90D of similar vintage.
But I can never get a straight answer on useable capacity and why I can spend or charge more than 75Kw on a 90Kw battery.
I am still happy with the car as I don't pay for the charging for my work as I supercharge everyday on the way home, because I can't make 1.5 round trips without rolling in on the way home with 1% at the nearest charger, if I am even able to make it. When I compare what I would pay for and ICE car in maintenance and gas, the Tesla made sense for my purpose. I also use it to make the 2000 mile R/T to pick up a drop off my daughter at college, effectively making the trip for free. We pack snacks and food for the entire trip and nap in the car.
Any tips or suggestions?