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Is there an area on your car that faces south at a 45 degree angle? because if you have the solar panels flat their output is going to be reduced by about 1/3rd because they will no longer be pointing at the sun.
Also the life span of PV panels is 50+ years and average life span of a car is 8 years altho some do last longer the cars that tend to last 50 years tend to be garaged most of their life and spend very little time on the road, so ingratiating PV in to a part of a car seems like a silly idea.
But with that said there should be enough space on the roof of your car that after all is said and done you should be able to get 40-50 watts out of the and with an average of 2-4 sun hours per day (again, not an ideal angle) that would mean 80-200 watt hours per day, plenty to run the radio (15-50 watts for regular car radios) and you might be able to find an electric heat pump/AC that would run off that amount of energy but it would be way cheaper to have it hooked up to a vent fan to bring fresh air in to the car in the summer, top off a deep cycle battery that could then help reduce the alternator load (DC-DC converter to get the voltage to 13.4v would be needed to keep the alternator off) and of course while you are driving it would help a bit too, assuming that it was sunny and the sun was high enough in the sky.
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