They feature a top quality Danfoss BD250GH compressor with controller 101NO280. They will run on 12 or 24 volts DC. They also feature titanium heat exchangers and heavy stainless steel cabinets so they could be used on salt or fresh water settings. You would have to circulate lake or ocean water through the cooling exchanger and whatever water you wanted to cool for fish or beverages. With a high efficiency 1/5 hp compressor they would definitely keep your beer cold.
Can also be used with glycol solutions. The compressors are found in many mobile use coolers like semi truck cab refrigerators etc. We can test run for you if desired but have never found a bad one yet. The item "AquaLogic 12 24 VDC Fish Cooler Chiller Danfoss Compressor Titanium Heat Exchang" is in sale since Sunday, May 13, 2018.This item is in the category "eBay Motors\Parts & Accessories\Car Electronics\12-Volt Portable Appliances". The seller is "bestfindsever" and is located in Prescott, Arizona.
This item can be shipped worldwide.