I spent the weekend researching and found that most of these cooler style refrigerators are intended to be used in a truck or camper so plug into a cigarette lighter or 12v power port. When they are advertised to run on 110v that usually means they come with a wall adapter the 12v plug goes into. There were a couple that had both a 110v and 12v plug but there was no mention of automatic switching in some. It was the really high end units that would have 110v as the primary power source, switching automatically to 12 volts when 11o was not available.

I also found that pretty much anything with a compressor is going to have a Danfoss compressor regardless of the brand.

It seems the biggest issue I'm going to have is trying to find something with the dimensions required to fit in the locker.