umm... Bob... the power outlet that turns off with the ignition is called a lighter, not a power outlet.. *g*
I have 2 inverters, a plug in one for when we rent cars and a real one, that's in the ram and hard wired..
Both work well in our trucks but the real one has a 40 amp fuse, so plugging it into a power outlet with a 20 amp fuse seems a little strange...
Both inverters will "beep" when you turn the ignition on or off, but I've had the laptop running from the hardwired one for up to an hour and still had plenty of cranking power.. The plug in one turns off within 15 minutes.. my guess is that because it doesn't have an on/off switch like the other one, it's more sensitive to power drop??
Mac