This solar vent is something I have never thought of. Another great place to put solar panels to generate more energy and save you money in the process.If you can't afford expensive solar panels to cover your whole roof, this may be at least a start.
I was thinking window shutters, window sills or even down spouts would be other things that are soaking in the sun long enough. Through out the day these things that usually just hang on the house, could be doing possibly more by generating energy as well.
We are not too far from this reality.
This is a attic vent with a fan. There is no doubt that the fan can be very helpful. Similar to the Solar vent except it is perfect for removing heat and storing it all at the same time.