I am purchasing a macbook soon but I am going to start collecting accessories now. One of the things I am in the market for is an inverter for the car. My question to someone who has more electronics knowledge than me is what can be used that doesn't fry a laptop. Most of the ones I have seen in store use a "modified sine wave" or a PWM (pulse width modulation) sine wave. I just wondered if a synthetic sine wave would damage the PS in the laptop or the power brick for that matter? Also if anyone could recommend one that will work or has worked for you without incident that would be great. I know of some people who used one and the inverter would stop working after 1 hour because it overheated from all the conversion losses and it would need to cool off before working again. Definitely want to avoid that but it is obviously impossible to tell from the packaging if this would happen. I need real world experience from someone. Thanks in advance.