Powerstream UPS

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I got this device to implement a UPS in my car. Originally the car computer was going to be 8track. It will probably be powering my Kenwood mobile radio, a GPS receiver and a BeagleBoneBlack. I have to check the total draw, 10A might be too small.

PST-DC-UPS-1212-10A

www.powerstream.com

http://www.powerstream.com/DC-UPS-1212-10A.htm

The device is marked N13.1, P10. Those are factory settings with this effect:
N13.1 = switches to aux battery when car electrical connection goes below 13.1
P10 = shuts off when aux battery drops to 10V

That means that even though I might have a live connection (always on) to the car, the battery will not be drawn down when the engine is shut off.