I just read in the manual that the max power for the built in 120v supply is 150w. At 12v that is drawing 12.5a, if my math is correct. (W = VxA) I think that is near or at the max you would be able to plug into a cigarette lighter. Converters that power devices over this recommend a direct battery connection.Acustk5 said:Has anyone experienced any problems with the adapters? Seems many people I know who've used them say they've burned out on them. The ones you plug in the power adapter (cigarette lighters) can only carry a limited amount of amperage because of the smaller wires.