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20 Ampere Output      
Add a Battery to any Vehicle to Power Accessories      
Automatically Parallells Batteries when Engine is Running       
Isolates Batteries when Engine is Stopped       
Auto Boost Parallels Batteries for Engine Start       
Automatic Battery Charger to Maintain both Auxiliary and Main Batteries       
Bar Graph Display Indicates Battery Voltage and Charger Output Current      
All Accessories may be Connected to Auxiliary Battery 
Often, in many vehicles when numerous accessories are added, it is desirable to add an additional battery. The Add-A-Bat, Model 091-171, simplifies this installation and provides a battery charger for the vehicle’s battery as well as the newly installed auxiliary battery. The accessories are connected to the auxiliary battery and thus reduces the burden on the vehicle’s battery. A high current solenoid connects the two batteries whenever the alternator output is detected. This charges both batteries when the engine is running. An Auto Boost feature parallels the batteries for engine cranking whenever the auxiliary battery has sufficient charge. The triple bar graph display indicates the voltage of each battery and the charger output current whenever the vehicle is plugged into AC shore power.   
http://www.kussmaul.com