1. The problem statement, all variables and given/known data For my ongoing project, I'm thinking of using Solar panels and Regenerative braking system as two main sources to charge the batteries that will run the motor and in turn the accessories of the car. 2. Relevant equations I've to think of how can the above sources increase the overall efficiency of the car? 3. The attempt at a solution 1) The use of battery pack can reduce the overall weight of the car and thus decreases the aerodynamic drag. 2) Using solar energy as an alternative to non-renewable resource such as petroleum that means the car won’t emit dangerous gases while using solar power to run the accessories. Wondering if the above statements sound legit?