Coleman Stirling Power Cooler are tough to find, but sip the juice @ 48 watts. I forget who made these for coleman, some Japanese company maybe?
doesn't use conventional cooling. very popular on boats. I've got one and it was $800 several years ago, so not super cheap.
It was used in the so-called hot air engine, which was considered at the time to be capable of replacing the steam engine. This was partly because the boilers used in early steam engines were prone to explosion. The counterpart of the hot air motor, the refrigerator, was first recognized in 1832. Both machines experienced high and low points during the nineteenth century. Scottish minister, Robert Stirling
The principle behind the machines was almost condemned to obscurity after the invention of the internal combustion engine (gas-, petrol-, and diesel motors) and compressor refrigerators with external evaporation.
In 1938 Philips Research Laboratories was looking for a means of generating electricity to power radios in remote areas where there was no electricity supply. The practically-forgotten hot air motor attracted attention. In 1946 Philips started studying the cooling techniques used in the Stirling cycle. The result was the development of the cold gasrefrigerator.
This machine, the cryogenerator, marked the start of significant cryogenic activities at Philips. So even though the Stirling hot air motor never became a commercial success, the Stirling cryogenerator is incorporated in equipment used from Antarctica to the North Pole.
In 1990, Philips’ cooling-related activities became independent and eventually continued under the name of Stirling Cryogenics BV. Thanks to continual innovation and considerable investment in R&D, the Stirling cryogenerator is now used in advanced technological machinery for cooling gases and liquids to extremely low temperatures
(200 K to 20 K).
Applications with Stirling cryogenerators are used in a wide range of applications, including the production of liquid gases, cooling gases and liquids, and cooling during (industrial) processes.