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Charging + Driving tips for those living in a valley? High usage for the first 10 kms

Discussion in 'Model S: Battery & Charging' started by krnshh, Sep 1, 2015.

  1. krnshh

    krnshh Member

    Sep 2, 2014

    We live in a bit of a valley and for my daily driving to work, I have to take the motorway in about 1 km after unplugging which is a bit of an uphill road for about 10 kms. The car has an extremely high kwh usage of around 400-450wh/km for that period of time and there seems no way we can reduce it, unless we have driven a while after charging on flat roads.

    Are there any tips to reduce the wh/km? Something related to charging or such or should we just ignore this?

    Plus, does this mean any long term concerns on battery degradation?

  2. mikeash

    mikeash Active Member

    Oct 26, 2014
    Fairfax, VA, USA
    If you're going uphill then increased consumption is expected. It takes energy to lift the car against gravity. You will mostly make it up when coming back down.
  3. Dborn

    Dborn Confirmed

    Aug 26, 2011
    Sydney, Australia
    It seems strange, but depending on where I have last charged, it seems my average wh/ km for that charge session will vary. For instance if I fill up at home, I have a steep hill straight out of my driveway. I cannot seem to get my average down below 220. If I charge up fully at my place of work, where it is level and downhill all the way home, my average is often 200. If I supercharge ( close to home), it is somewhere in between. The driving I do is all on the same relative routes, so you would expect it all to average out about the same, but it doesn't.
  4. bxr140

    bxr140 Member

    Nov 18, 2014
    Bay Area
    Its zero problem. Its just the math doing what math does--its dividing a big number (Wh) that is the obvious result of uphill vs flat land travel by a small number (km traveled).
  5. stevezzzz

    stevezzzz R;SigS;P85D;SigX

    Nov 13, 2009
    Not to worry. I've got the same sort of situation when I leave my house: it's uphill for a mile or two in most directions. I often see an average of 700-800 Wh/mi as I crest the hill; by the time I return home along the same route, my average has dropped to around 300 Wh/mi, which is my summertime average. It's no different when I leave the house in the one direction that travels downhill: I see great consumption numbers to start with but by the time I return home, consumption for the trip is back up to right around the long-term average.

    Your uphill average discharge rate of 400-450 Wh/km is very low compared to a rate that might stress the battery pack; I'd just not spend any time worrying about it.

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