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110 vs 220v

Discussion in 'Model S: Battery & Charging' started by White Knight, Sep 25, 2019.

  1. White Knight

    White Knight Member

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    What is cheaper on electricity. Use a 110v charge (take longer) vs 220v (30 amp breaker) with a faster charge
     
  2. brianman

    brianman Burrito Founder

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    Broad brushstrokes:
    Resistance = loss. Resistance scales with the square of current. For the same power, lower current is better. Higher voltage is generally less lossy / wasteful.
     
  3. ucmndd

    ucmndd Well-Known Member

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    True, but accounting for the car’s overhead required to power itself and the charging circuitry, 240v charging is more efficient. This is borne out in Tesla’s own MPH figures for various charging figures.
     
  4. ucmndd

    ucmndd Well-Known Member

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    1) US nominal voltages have been 120v and 240v for about a hundred years now.

    2) 240v charging is more efficient and will cost less because more of the kWh drawn from your meter will actually end up as energy in the battery.
     
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  5. ewoodrick

    ewoodrick Well-Known Member

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    This is easy! Both are better than gas!

    Power costs the same at either voltage. 240 is able to charge faster.
    You are overthinking the whole thing
     
  6. brianman

    brianman Burrito Founder

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    Your "but" doesn't make sense as the rest of the sentence agrees with what I said.
     
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  7. ucmndd

    ucmndd Well-Known Member

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    Indeed. I misread what you were saying.
     
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