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completely worthless.
to the point that they can actually drain your car battery.. In order for it to be effective it needs to be the size of the roof of the vehicle, a 12" x 6" panel on the dash is worthless for anything except maybe charging a cell phone.
yes I have tried them, IMO it is just another of those wonderful snake oil products.
also keep in mind these run thru the cig lighter, and since ours are not active when the car is not running, (they are switched off) they will do nothing for you unless you rewire that connection to be always hot.
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