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Holy Crap - why to get a DC-DC for laptop

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  • Holy Crap - why to get a DC-DC for laptop

    Jumping Jehusafads Batman! Look what a little math can do for you.

    I have a Dell Inspiron 1150, I use daily. Well, My charger always gets VERY hot, so i decided to check out the power labels on it. 65w Charger.
    Input: 120v, 1.5a
    Output: 19.5v 3.34a

    OK, cool... but what does it all mean?

    120*1.5 = 180 watts
    19.5*3.34 = 65.13

    HOLY CRAP ON A STICK! I was losing 115 watts to heat! WOW! Thats alot. Almost all of the Opus 120!

    OK, so here's a situation.

    65.13/180 = 36.2% effieciency.
    Multiply with a 90% efficient inverter: 32% effiencey.

    Holy Crap! 32% efficient. On my "65 watt" charger that means it's really sucking up:

    65/.32 = 203 watts! HOLY CRAP!
    That's like 138 watts of wasted heat! Do you want that heat building up in your car o na hot summer day? Might even cause a fire!

    So, that's why you should go with a DC-DC adapter. Much more efficient. :-)

    Good day.