Power Inverter for Car.

[XAshKetchumX]

So I've been getting really desperate to charge my laptop as I can't even get a full 3 hours out of it due to my insane powerful CPU. I have the MSI GT-70 Dominator (surprisingly really light thanks to the magnesium), and I was wondering what power inverter would suite for me best? (Note: I'm the only one in the car with a power-hungry laptop.)

 

[JackNaylorPE]

I went thru several in the 90s... broke while I was outat state, walked into a CompUSA and bought a Belkin 1n 1994, still using it. The thing that makes this one stand out is it's a solid brick w/ no fan.