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A much easier solution - a PC power supply. The +12v rail is rated at 20A or more on any modern supply, and they cost about $50, and are nice and lightweight. The marvels of mass produced switchmode units.
And yes, peltiers draw a lot of current. My cooler with 3 peltiers draws about 10A, the heavy duty 12v wire that runs from my power supply to the scope gets quite warm while it's running.
Bird
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