Burat

My CarPC has a Opus Power Unit built in and starts when I switch the engine on and shuts down when I turn it off again. Works very good for normal in-car use.

But sometimes, once a week, I want to upload some new mp3 or install some updates/programs over the WiFi connection using Remote Desktop.

How should I start the CarPC without turning on the ignition and/or leaving the key in the car? My battery can easily power the pc for a few hours...