TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker or making a Paypal contribution here: paypal.me/SupportTMC

Regen isn't added to range

Discussion in 'Model S: Battery & Charging' started by David99, May 2, 2014.

  1. David99

    David99 Active Member

    Joined:
    Jan 31, 2014
    Messages:
    2,051
    Location:
    Brea, Orange County
    I noticed an interesting behavior when I have longer stretches of going downhill and using regen to put in a good amount of energy back into the battery. As I was going down I kept an eye on the trip meter which keeps track of the energy in kWh. At the bottom of the hill I saw 0.7 kWh where added from regen. That would roughly be 2 miles. The Model S doesn't add these to the range, though. The rated range number did no change. It stayed as it was before going downhill. What's interesting, though is that i was able to drive about 2-3 miles (at 300 Wh/mile) before the number decreased. It seems the energy gained through regen isn't added into the rated range in terms of the numbers displayed, but of course the energy is captured and available.
     
  2. Lloyd

    Lloyd Active Member

    Joined:
    Jan 12, 2011
    Messages:
    4,885
    Location:
    San Luis Obispo, CA
    It does, you just need a bigger hill! I just came down San Marcos pass into Santa Barbara and gained 5 miles on the downhill side.
     
  3. stevezzzz

    stevezzzz R;SigS;P85D;SigX

    Joined:
    Nov 13, 2009
    Messages:
    6,062
    Location:
    Colorado
    For reasons only Tesla knows, you have to add about 1.0 kWh of regen before the rated range display changes, usually (but not always) by bumping up by 3 miles.
     
  4. Kraken

    Kraken Member

    Joined:
    Nov 20, 2012
    Messages:
    799
    Location:
    Voltageville, CA
    What they said. Up to 3 miles, it just makes it so you don't burn a mile until the excess energy is burned off. After 3 miles of regen, it shows up. You also get all that distance you were regening for free!
     
  5. David99

    David99 Active Member

    Joined:
    Jan 31, 2014
    Messages:
    2,051
    Location:
    Brea, Orange County
    Interesting! So there seems to be a threshold before it starts to show up as a number.
     
  6. simonog

    simonog Member

    Joined:
    Jan 9, 2014
    Messages:
    350
    Location:
    United Kingdom
    That makes sense in that the displayed range has a smoothing effect from sudden usage or regeneration if only of short duration. It avoids the number flickering up and down.
     
  7. dirkhh

    dirkhh Middle-aged Member

    Joined:
    Jul 7, 2013
    Messages:
    3,645
    Location:
    Portland, OR, USA
    Funnily enough I had to try several times until I finally found a big enough "hill" (actually, Mt Shasta), to see my range go up (by 3 miles, as others have mentioned).
     
  8. Cottonwood

    Cottonwood Roadster#433, Model S#S37

    Joined:
    Feb 27, 2009
    Messages:
    5,062
    Location:
    Colorado
    Steve is exactly correct. There is a dead zone of 1.0 kWh. Nothing shows up as additional rated miles until you accumulate the 1.0 kWh.

    Because 1.0 kWh is slightly more than 3 rated miles, this usually shows up as 3 additional rated miles, but can sometimes be tallied as 4 rated miles. Even if you don't pass the 1.0 kWh threshold, the regen energy is in the battery; the rated miles remaining just won't decrement until you have used up that regen energy and another rated mile.
     

Share This Page