12 DC - 240 AC Inverter

[MajorPart]

I wish to use my laptop while travelling (not while driving tho, although detailed GPS Nav would be cool) and will not have a power connection on the routes when i stop.

I want to buy an inverter and it seems that most tend to be 150W.
I've checked my laptop charger (Fujitsu Siemens AMILO M 3438G)
I states 240V in is at 2A and the output at 20V is at 6A

Now from caluculating using the 240 figures

P=V*A = 480Watts!!

Now am i missing the mark here or would a 150W inverter just melt at the thought of my laptop charger?

 

[MajorPart]

Dude, my XPS Gen 2 wouldnt even get near 150W.....

It's pretty much the same system minus your funky lights..

It might just be a generic charger made to supply newer generations of siemans laptops ie that use more power, higher cap batteries etc.

The Laptop gets fairly warm and the charger does get quite hot on max load (ie doing folding at home, charging a flat battery with LCD Screen on full brighness doing some work in PS CS.) but not as hot as the stats would say it should at max load

Finally does that mean there will be roughly a 12 AMP draw through the cigarette socket/car altenator?

Here's a pic showing the underside of the charger.

 

[MajorPart]

I'm leaning in the way of your thought too, as i would have never thought a 2Ghz Laptop even with a 17inch screen and a graphics card could draw that much but i guess it has to be fairly beefy. I'll a 150 Watt version but get one with thermal and current overload protection just to be safe

Till i looked i never thought laptops would take a 20V input...

Cheers for the advice guys!

 

[MajorPart]

Whent for a DC / DC power source in the end. Trust Car/Plane Notebook Power Adapter 250NCP (20V 6A/120W). So hopefully that will suffice.

Thanks for the help!