Powerstream UPS
From Wildsong
I got this device to implement a UPS in my car. Originally the car computer was going to be 8track.
PST-DC-UPS-1212-10A
www.powerstream.com
http://www.powerstream.com/DC-UPS-1212-10A.htm
N13.1 = switches to aux battery when car battery goes below 13.1 P10 = shuts off when aux battery drops to 10V