Sound more like .3A to me. I normally figure 100 watts per amp (actually it's higher than that). Which would mean 170 to 330 hours, which would make it at least possible for 7 days. Larry Pint > -----Original Message----- > From: tclug-list-bounces at mn-linux.org [mailto:tclug-list-bounces at mn- > linux.org] On Behalf Of Jonathon Jongsma > Sent: Thursday, February 01, 2007 1:11 PM > To: Donovan Niesen > Cc: tclug-list at mn-linux.org > Subject: Re: [tclug-list] OT: CoM and LCD display... expected life on a > carbattery? > > 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 > > _______________________________________________ > TCLUG Mailing List - Minneapolis/St. Paul, Minnesota > tclug-list at mn-linux.org > http://mailman.mn-linux.org/mailman/listinfo/tclug-list