This doesn't make a lot of differnce to me because my car has a generator; but two questions:
- Others on Ecomodder have experimented with totally replacing the battery with supercapacitors. Could you suggest a way to have a supercapacitor buffering a battery? Because if you could I could see dual alternators on a serpentine-belt pulley system with big, fat wires.
- There exist sites like https://www.instructables.com/ where you can get greater exposure for your idea. Have you thought about posting it on a maker website?