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The problem isn't so much the limited 10A capacity of the outlet, but in the performance of the PV panel itself. They don't supply much current to begin with, and if they aren't pointed directly at the sun, which is constantly moving relative to the car, then the output is a fraction of the rated output.
There is no worry of overloading the cigarette outlet, but I can't imagine the charger would do much good. The main benefit would be keeping the battery of a car that isn't driven often enough, topped up and in good condition.
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