Quote: Originally Posted by
midiwall 
So... you're talking about wanting to run your system for 48 hours without the car ever having been started? That kinda' leads me to ask "why"? Camping?
If you really wanna do this, then you should look at rigging a pair of batteries in parallel and dedicate them to the G4 (and the amps since you'll need those as well). I'd recommend the Optima Yellow or Blue tops - NOT the Red Top. The Red Top can be damaged if it drains to 0.
I often don't drive my car on either Saturday or Sunday. Since the standby period is only around 16 hours, it is virtually guaranteed that at least once a week (Sunday or Monday, or even Saturday if I don't go out until late in the afternoon), the system will be booting from scratch. I could fix that by making it always hibernate, but I didn't spend thousands of dollars to have to wait a minute or longer to get audio every time I start my car.
Thanks for the battery advice. I don't think my car has room for 2 batteries, but I'll talk to my mechanic when I go in for an oil change soon.
John