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OK I could be wrong, haven't put a whole lot of thought into it, but perhaps the peltiers wouldn't be as capable of supplying the vehicles' electrical needs as the ol tried n true, relatively inexpensive alternator systems, even if the peltiers do come down in cost with further development and acceptance. For instance, there is probably no charging when cold... on a vehicle that does frequent short trips would the charging system keep up? The manufacturers pretty much have to design things for the worst case scenario.
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