I agree an AC powered fan will move a LOT more air then any solar powered fan, and it will work to continue to lower attic temperature AFTER the sun goes down. I also agree with a suitable way to stop the fan in case of a fire. There have been previous threads on this as well as some very good information on fan with built in fire stop capability.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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