How many Watts needed to power MBP?

Discussion in 'Buying Tips and Advice' started by Jamesw, Jul 21, 2006.

  1. Jamesw macrumors member

    Joined:
    Jun 4, 2006
    #1
    So I'm driving down to North Carolina from Ontario (approx 12 hours?)
    I bought this thing where you plug into the cig lighter and I can use it as an outlet. If I wanted to plug my MBP into the plug (which supports max 75W) will it be enough for my MBP? I went to the Apple store and the genius said he wasnt TOO sure but he said it should be okay.
     
  2. michaelrjohnson macrumors 68020

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    Aug 9, 2000
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    54140
    #2
    85W (Link)

    For future reference, it's written on the power adapter.
     
  3. T-Stex macrumors 6502

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    Jan 15, 2006
    Location:
    Pennsylvania
    #3
    I don't think that it's necessarily 85W. I know that the stock power supply is 85W, but you can use less. If you use the regular 65W charger (or a 75W power supply in this case), it will power the MacBook Pro, but won't provide enough power to charge the battery during use. You should be fine using your car charger to power it during use.
     
  4. AvSRoCkCO1067 macrumors 65816

    AvSRoCkCO1067

    Joined:
    Sep 6, 2005
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    CO
    #4
    You're right, actually. The charger that comes with the Macbook (60-65 watts) actually works with the MacBook Pro. Only during especially processor-intensive tasks does the MacBook Pro require all 85 watts.
     
  5. KingYaba macrumors 68040

    KingYaba

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    #5
    75w will be fine.
     
  6. robbieduncan Moderator emeritus

    robbieduncan

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    Jul 24, 2002
    Location:
    London
    #6
    I was able to power and charge (OK slowly but still) my MBP using the 75W supply on a BA flight a few months back.
     
  7. michaelrjohnson macrumors 68020

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    Aug 9, 2000
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    #7
    Regular charger? The one that comes with the MBP is 85W. What do you mean by regular charger?

    And the device he's referring to is not a power supply, it's a power inverter that supports a maximum of 75W output. (Maybe not even 75W sustained!) The issue is that the device may detect an overload, as it will try to pull 85W from the unit, and might shut down... or worse, if it does not have an Overload Auto-Shutdown, it may overload this inverter and possibly cause damage to the inverter or blow a fuse, intentionally!
     
  8. munkees macrumors 65816

    munkees

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    Sep 3, 2005
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    Pacific Northwest
    #8
    I sure that must mack larger inverters for cars over 75W
     
  9. michaelrjohnson macrumors 68020

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    Aug 9, 2000
    Location:
    54140
    #9
    They do. But the OP doesn't have one.
     
  10. Jamesw thread starter macrumors member

    Joined:
    Jun 4, 2006
    #10
    They had bigger ones.
    I got one from Radio Shack $29.99 US for 75W
    They had the Radio Shack $39.99 for the 150W
    They also had the Kingston (sold @ apple) 150W for $65 US.
    I picked up the cheap one, lets just pray it works out.
     

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