SolusCado

Hello everyone. I have a CarPC implementation using the CarNetix P2140 power supply to great effect. However, there are time when I want to leave the PC running overnight to synchronize files over the wireless network, etc. and of course the PC draws far too much power to run off the battery all night long.

I also have 15 amp, 13.8V AC/DC 'converter/power supply'. It is a device I picked up at Radio Shack that plugs into an AC outlet, and provides the above spec'd DC power via two terminals (Red/Black, +/-). I have managed to mount this device next to my car battery and routed the AC cord through the grill so that I can just pull out the cable and plug it in to my garage without even opening my hood.

I have successfully used this device in the past to power my CarPC by removing the terminals from the car battery and instead wiring them to this device. The 15 amps isn't enough to power headlights as well, so I have to be sure to turn them (and all other ancillary electrical devices in the car) off, but it is sufficient power for the CarPC itself.

I have however been hesitant to connect the terminals to between the Power Supply and the Car Battery because I don't know what would happen... Would the AC device actually charge the Battery? Would the battery's electricity somehow short out the AC device? If the AC device DID charge the Battery, what would happen when the Battery reached full capacity? Does anyone either know or at least have some educated input?