12v fridge change over

[Navicula]

I have a freezer on top with the fridge below........there is a drain plug that goes to the fridge..........I have a 120V system (120v compressor and water cooled with a 120V pump Alder Barber cold Plates)

I want to change this system to 12 volts air cooled....I only want one compressor...is this possible....what system can you recomend

thanks