Check out http://www.powerwerx.com/batteries-chargers/
I've used products from this company for a few projects and have always been happy. Look at either a battery separator or battery isolator and, as Jonathan recommended, use a separate battery with the AH rating you need for your project. Be careful about what you hook up to a car power system, 12 volts doesn't always mean 12 volts. You will see a swing of +- 25% between when the battery is low and what the alternator puts out. Either check to make sure that the gear you're hooking up is happy with a large range, or take extra steps to smooth out the power. Ham radio folks have been running RF gear in cars for decades now. See what resources you can dig up with that in mind. -Luke =-=-=-=-=-=-=-=-=-=-=-= Luke Jenkins Network Engineer Weber State University On Nov 5, 2012, at 4:24 AM, Jonathan Gazeley <[email protected]> wrote: > On 02/11/12 20:33, Chuck Enfield wrote: >> Seems to me the power supply in the truck is your best bet. The router >> probably runs on DC at relatively low power compared to something like a >> car stereo, and the truck's battery would make as good an all-weather UPS >> as anything I can think of. > > I don't have any direct experience running wireless in a truck, but I do > frequently run a motorised telescope from a car battery in remote locations. > I would advise against running anything directly from the truck's battery in > case you over-discharge it and are unable to start the engine again. > > Either use a deep-cycle leisure battery (which can be charged from the engine > when running, but kept separate from the main vehicle battery when > discharging) or if you really want to run off the main battery, include some > electronics that will prevent over-discharge. > > You can find these kind of systems in motorhomes - perhaps ask a motorhome > service centre about getting this kind of circuit put into your truck. > > Cheers, > Jonathan > > ********** > Participation and subscription information for this EDUCAUSE Constituent > Group discussion list can be found at http://www.educause.edu/groups/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
