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

Newbie Charging Cost Question

Discussion in 'Model S: Battery & Charging' started by cplaw, Aug 29, 2016.

  1. cplaw

    cplaw Member

    Joined:
    Jul 14, 2016
    Messages:
    143
    Location:
    Los Angeles
    Total newbie question here, but if the Model S 60 comes with a 60 kWh battery and a charging station charges $.30/kWh, does that mean an empty battery would cost $18.00 to charge to full capacity? Am I calculating the cost correctly?

    Thanks.
     
  2. skitown

    skitown Member

    Joined:
    Dec 28, 2015
    Messages:
    16
    Location:
    McCall, ID
    Your math looks correct to me.
     
  3. cplaw

    cplaw Member

    Joined:
    Jul 14, 2016
    Messages:
    143
    Location:
    Los Angeles
    Thanks, I just wasn't sure if it's that straight forward.
     
  4. deonb

    deonb Active Member

    Joined:
    Mar 4, 2013
    Messages:
    3,019
    Location:
    Redmond, WA
    It's not... but it's close enough.
     
  5. Blu Zap

    Blu Zap Grinning member

    Joined:
    Oct 1, 2014
    Messages:
    437
    Location:
    San Rafael, CA
    Most utilities offer lower rates after 11:00 pm. That will help. I was paying .109/kWh with PG&E in NorCal. Not sure what your utility would charge.
     
  6. Saghost

    Saghost Active Member

    Joined:
    Oct 9, 2013
    Messages:
    2,949
    Location:
    Delaware
    Your math is right, your assumptions are unusual.

    The 60 kWh battery pack doesn't actually have 60 usable kWh for driving, and it takes more power from the wall than you get back to drive on.

    It's not common to drive an EV until the battery is drained before filling it- most people charge every day for that day's usage.

    It's also unusual (but not unheard of) for a charging station to bill by the kWh - in many places that invokes laws about selling power intended for regulating utilities, so a lot of stations charge by the hour instead.

    If you have a price per kWh and you know a typical daily or monthly driving distance, go to fuel economy dot gov and find the car's rating in kWh per hundred miles. That will give you how much electricity from the outlet you need to cover each mile, which you can multiply by your price per kWh to get the overall cost.
     
  7. NikeWings

    NikeWings Member

    Joined:
    Apr 7, 2016
    Messages:
    964
    Location:
    Los Angeles
    All good points, and as @Blu Zap says above, there are significant off peak price reductions. Both LADWP and SCE offer this in the LA area so check out the one which applies to you.
     
  8. ForeverFree

    ForeverFree Member

    Joined:
    Jul 9, 2015
    Messages:
    45
    Location:
    Sherman Oaks, CA
    At least here in the San Fernando Valley, Los Angeles DWP offers free high-speed charging at the DWP substation, if you have a Chademo adapter.
     
  9. No2DinosaurFuel

    Joined:
    Apr 16, 2015
    Messages:
    772
    Location:
    San Diego, California
    It will be close. Keep in mind you most likely will never be empty when charging. So to say charging the full 60KWh, it will be highly unlikely. Moreover, there will be charging inefficiency. So expect to pull more from the wall than is putting into the batteries. Also everything else that is on during charging. So it might be slightly more because of inefficiencies and what not, but slightly less because you will almost never start charging from empty.
     
  10. Model S M.D.

    Model S M.D. Ludicrous Radiologist

    Joined:
    Oct 31, 2015
    Messages:
    724
    Location:
    Houston, TX
    If you are charging at home I would just focus on your home electricity rates. I'm paying 8.9 c/kWh, so I'd spend $5 to fill up 60 kWh :)
     
  11. AndreSF

    AndreSF Member

    Joined:
    Feb 21, 2016
    Messages:
    183
    Location:
    San Francisco, CA
    You can use Tesla charging estimator/calculator to figure out how much specific range charge would cost you to fill up at a specific electric rate:

    Tesla Charging | Tesla
     

Share This Page