I am going to buy a Monster Mobile PowerStation 150-Watt Power Inverter. It will plug into my car lighter, and then provide the 2 and 3 pronged power outlets. How many watts does a powerbook 17" (the model just before the most recent one... the one with 1440x900 resolution) require? Is it safe to run it on this product? Think it will work? http://www.monstercable.com/caraudio2/productPageCar.asp?pin=2732 Thanks.