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Maybe you need to give us some more information. Is your project goal to use the Peltier cooler for something, or to somehow keep a solar car cool?
In any case, you want to start from the basics, like the (in)efficiency of the Peltier cooler. Look at how much power can be generated from solar cells, how much it takes to run a car, how much heat needs to be removed to keep it cool...
Personally, I'd think about insulation - keeping heat out (or in, in the winter) before working on cooling.
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