You are similar to a perpetual motion machine. Your generator consumes the kinetic energy of the motor while obtaining mechanical energy, and part of this energy will be lost when it is converted into electrical energy and used to charge the battery through the charger, and you The voltage will be very unstable. You also need a voltage stabilizing system to provide a stable 220v voltage to the charger. In the end, the electricity you get will be very little. The added generator, charger and voltage stabilizing system will consume their own weight and energy. , and your later maintenance costs are basically worth the loss!
You just want to run farther, so it is easier and more feasible to change to a battery with a larger capacity, or it is more economical and feasible to change your driving habits to avoid slamming on the accelerator, braking and driving quickly!