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How much power ?

Discussion in 'Electronic Basics' started by SAH, Feb 4, 2004.

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  1. SAH

    SAH Guest

    I need to purchase a small 12Vdc plugin inverter to run a laptop in my car.
    According to the specs on the AC charger, it's max current at 120Vac is
    1.5A. When I pick out an inverter, what is the minimum power requirment I
    will need ?
     
  2. Ian Stirling

    Ian Stirling Guest

    If you believe the label, 1.5*120=180w.
    I'd be very surprised if any laptop exceeded 100W in real life.
     
  3. SAH

    SAH Guest

    Well, it does say 1.5 A max, probably might go that high if the battery was
    dead (and charging) and you were using the laptop at the same time,...maybe
    ?

    So I guess I would be safe with a 175 Watt inverter than.

    40.00 CAD
     
  4. Ian Stirling

    Ian Stirling Guest

    Look at the DC power use of the laptop.
    It may be on the bottom.
    Multiply this wattage by 1.3, and you should come to a more realistic
    AC power.
    However, 175W should work just fine.
     
  5. JeB

    JeB Guest

    and you might check to see if your computer can use some sort of
    automotive adapter. You're buying an inverter to convert 12vdc to
    120vac to run a battery charger that converts the 120vac back to some dc
    voltage to charge the battery.
     
  6. SAH

    SAH Guest

    Ya, I hear ya but its only 39.99, I'd be willing to bet that a 12V adapter
    for a Compaq laptop will be a shade more than 39.99 going by the way they
    fleece you for accessories. Not to mention that I can use the inverter for
    other things too, camping, etc....
     
  7. David Wood

    David Wood Guest

    Wouldn't it be funny if the laptop requires 12VDC and all that's
    really needed is one of those nice little curly cords with a fused
    lighter plug!?
     
  8. Ian Stirling

    Ian Stirling Guest

    The problem there is that the car supplies from about -40 to +80V, under
    various transient conditions, and from 8-16V with faults that'll
    let it run.
    This may kill your laptop.
     
  9. David Wood

    David Wood Guest

    The problem there is that the car supplies from about -40 to +80V, under
    I've plugged all kinds of electronics into the power in my car with no
    problem. I've been told this happens for two reasons: 1, the car
    battery acts as a capacitor and 2, the devices have their own
    regulators and/or transient suppressors if they're that sensitive.

    If you start the car then disconnect the battery and break the voltage
    regulator or diode pack you'll get "various transient conditions." Old
    cars may run in this condition but I don't care, nothing SAH does to
    power his laptop will kill mine;-]
     
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