I have a client who does mobile xrays. He has a Dell PC mounter in a van. Now he wants to use Verizon's Wireless Access. I found that I can get a PCI to PCMCIA adapter but now we need to poer the PC while driving. I have been looking at 12v power inverters for cars but dont know how many Watts of power I need. It's a Dell 2.0GHZ, 512MB, 40GB w/ 15'' LCD. Anyone have experiance with this stuff?

Thanks