LOL, that might keep the battery charged if you leave it in the sun.
No, I've seen a Honda insight that had an electric scooter motor drop out of the bottom. A 5th wheel. Is this what you are referencing? I don't see how you could possibly convert a TDI to electric assist and there would be no point. With the extra weight you'd lose mileage and with all the time and money you spend on the project, you'd be better off spending that money on fuel.
VW TDI forum, Audi, Porsche, and Chevy Cruze Diesel forum
A forum community dedicated to Audi, Volkswagen, Porsche, and all turbo diesel owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, TDI, maintenance, and more!