With DC to DC converter to output 13.8v for your normal car voltage accessories

New in box!   Never used.

https://fullriverbattery.com/chargers/part-922-7254/

Charger DC Output: VDC 72 

Maximum DC output power 1000 W

Maximum DC output current 12 A

Maximum DC output voltage 100 V

Deep discharge recovery (minimum voltage) 18 V

Maximum interlock current 0.5 A

Battery type Lead acid (Wet / AGM / GEL), lithium ion 

Reverse polarity Electronic protection with auto-reset 

Short circuit Electronic current limit