Most draw about six amps.. My Engel (A tad more expensive) holds like 47 cans and draws 3 amps when it's running.... (Like 800 dollars more expensive when I bought it)
I have used ones like that Koolatron and they are kind of handy, There is a diabetic in Mississipi who uses one for transporting insulin (I sent her one of my spares) but I have not been all that thrilled with them.
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