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question for you electrical experts, charging from empty or 1/2 full

Discussion in 'Model S: Battery & Charging' started by bellwilliam, Feb 15, 2013.

  1. bellwilliam

    bellwilliam Member

    Jan 9, 2013
    from the threads I've seen, it is much faster to charge from empty than 1/2 full, but does it cost less to charge (due to shorter time) ?

    scenario 1
    charging from 0 miles to 100 miles - 30 minutes.

    scenario 2
    charging from 150 miles to 250 miles - 60 minutes.

    does scenario 2 cost more ? due to longer charge. or it costs the same, because it will charge at slower amperage ?

  2. ElSupreme

    ElSupreme Model S 03182

    Jan 13, 2012
    Atlanta, GA
    It will cost you the same. There might be a slight difference in total power use but not enough to notice. Certainly less than 1 kWh.

    The reason the top of the batteries charges slower (still more than a single charger can supply) is due to the batteries being at higher voltage and thus closer to the charging voltage. This means less current flows into the batteries.

    The supply power decreases as the batteries suck in less power.
  3. shokunin

    shokunin P85 & M3

    Feb 28, 2012
    Irvine, CA
    Your times are supercharger times, not with the regular UMC charger or HPWC. Regardless you are being charged with kwh consumed whether it takes your an hour or two hours, the net is the same amount of kilowatts barring any temperature factors.

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