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Altitude, regen and range

Discussion in 'Model X: Battery & Charging' started by DiveDeep, Aug 27, 2016.

  1. DiveDeep

    DiveDeep Member

    Joined:
    May 9, 2016
    Messages:
    93
    Location:
    Utah
    Living along the Wasatch Front in Utah, I was really curious before taking delivery of my X how grades would effect the range of the car and how well the regen would recapture energy spent in hauling the car up a mountain grade.
    I think my latest cahrge may help everybody. I was really impressed by the outcome.

    So Thursday night I charged my X90D to full range 260 miles..
    The travel since then has included the following..

    From my home in Cedar Hills, Utah at 5000' exactly, 52 miles to Montage at Deer Valley Resort (Park City) at 8300' elevation (for the Tesla Roadtrip event), via Heber City Utah. On arrival I showed 175 rated range remaining.. (so that 3300' altitude gain cost me 33 miles rated range.. That is consistent with the 10 miles per 1000' altitued gain I've heard before. Outbound to Deer Valley.jpg

    Then back home via Salt Lake City through Parley's Canyon. Deer Valley Return.jpg

    Then a couple of short trips from home down into American Fork, involving ~ 400' descent and then climb back home.

    Finally a round trip from home to Draper Utah that was a total of 36 miles and 1100' net loss of altitude outbound and then the same gain ...returning

    The Attached picture of my trip display at the endo of that 165 miles I think tells the whole story...
    165 miles driven, rated range remaining 90 miles... so I have gotten only 5 miles less than rated range. NO I didn't drive like a granny the whole time!
    IMG_1537.JPG

    So, in my opinion regen is VERY effective as far as I can tell at delivering potential energy back into the battery so that grades do not affect range that much when the net altitude change is zero!
     
    • Informative x 3
  2. AB4EJ

    AB4EJ Member

    Joined:
    Feb 25, 2015
    Messages:
    585
    Location:
    Tuscaloosa, AL
    Recouping miles due to altitude is dependent on:

    - not touching the brakes (these are friction brakes, they don't cause regen like with the LEAF)
    - the lower the speed for regen (unless below a certain point) the better the regen, as the higher speed causes more I-squared-R losses, due to higher currents

    So, you are apparently doing it right!

    I need to get better at driving around town - I realize that more aggressive driving leads to having to use the brakes more, and in a Tesla that equals wasted energy (not so with all EVs).
     
  3. DiveDeep

    DiveDeep Member

    Joined:
    May 9, 2016
    Messages:
    93
    Location:
    Utah
    I have tried as much as possible to "anticipate" stops and decels in street driving so as to drive "one Pedal".
    As for the grades, the biggest descent was from Montage resort into Park City proper 8300' to ~ 7000' in 4 miles or so is a 45 mph road at best.
    The rest of the distance/highway was done mostly on autopilot.

    My next experiment wil be on a trip up to Helena to visit a friend who is on an old homestead ranch. The trip from SCs in Idaho Falls (4705') to Butte (5539') is 205 miles and 800' net elevation gain, but lots of moderate ups and downs over the course. Lima MT is as high as 6250' I'll likely run it a 65 mph and see how the range works out!

    You are however right.. even in a non-P Tesla, it is tempting to have fun, aint it? Punching the Go pedal never gets old!
     

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