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

Added power consumption from charging?

Discussion in 'Model S: Battery & Charging' started by Barry, Oct 10, 2014.

  1. Barry

    Barry Member

    Joined:
    Aug 9, 2013
    Messages:
    786
    Location:
    Colorado
    Going through the HOA approval process to install a 220V 50A line for charging in my condo building. They asked me for some numbers on KWh used. Can someone provide some monthly numbers on energy usage and mileage driven? Thanks.
     
  2. TexasEV

    TexasEV Active Member

    Joined:
    Jun 5, 2013
    Messages:
    3,794
    Location:
    Austin, TX
    At 10 cents per kWh, figure $1 per hour of charging on a 50A circuit. That gives you 29 miles rated range.
     
  3. Cottonwood

    Cottonwood Roadster#433, Model S#S37

    Joined:
    Feb 27, 2009
    Messages:
    5,062
    Location:
    Colorado
    Those are rated miles. Depending on your driving style and number of miles, it's probably 0.35 to 0.45 kWh/mi from the wall including charger efficiency of about 90% and vampire, pre-heating, etc losses. (350 Wh/mi to 450 Wh/mi) Multiple those by miles driven per month, year, etc and you will get corresponding kWh per period.
     
  4. bradc

    bradc Member

    Joined:
    May 16, 2013
    Messages:
    40
    Location:
    Seattle, WA
    Most of my (nomal commute, non-spirited) driving I average about 300 Watt-hours per mile, maybe a tad over. Add in a little extra for non-locomotion energy usage (lights, climate control, vampire losses) and battery and charging inefficiency; call it 350 Watt-hours pulled from the wall per mile driven.

    From there you just have to multiply by the number of miles you drive per month. 1000 miles x 350 Watt-hours per mile = 350,000 Watt-hours = 350 kWh per month. Adjust for your driving habits accordingly.
     
  5. Tommy

    Tommy Member

    Joined:
    Mar 3, 2010
    Messages:
    880
    Location:
    The great OC
    Here are my numbers from the spreadsheet I keep on my energy usage. My "at wall" energy usage is roughly 20% higher than the Odometer kWh readings. Some observations: My watt usage per mile has gone down over the time I have owned the car; driving in winter uses more engery, even here in California. Hope the information helps. January of 2013 is the first entry

    Total miles.jpg
     
  6. Barry

    Barry Member

    Joined:
    Aug 9, 2013
    Messages:
    786
    Location:
    Colorado
    Thanks. Also found the calculator on the Tesla web site after my original post.
     

Share This Page