On 2/1/07, Donovan Niesen <dniesen at gmail.com> wrote: > I'm considering a project that would involve connecting a very > low-power Computer on Module and an LCD display inside a vehicle. The > vehicle will not be driven or possibly even started for an entire week > so what I'm wondering is if anyone knows how long I might have on a > fairly standard car battery if I'm using ~35 Watts from the LCD and > the CoM? > > My goal is a full 7 days so if I need to use a lower power LCD so be > it. Otherwise I will need to find a different way to power the > device. > > And yes, the CoM will be running Linux. The computer will be consuming 35W even when the vehicle is not in use? That's about 3A of current (assuming a 12V supply). It should be fairly easy to determine how long your battery will last by looking at your battery rating. I think (though I don't know for sure, I may be wrong) most standard car batteries are between 50-100 Amp-hours when fully charged. So at approximately 3A, the battery should last between 17 and 33 hours. -- jonathon jongsma