Abstract: The world is a storehouse of energy, and energy cannot be produced or destroyed, but it can be converted from one type of energy to another, according to the Energy Conservation Law. However, we are squandering the resources available to us. We're running out of it. We are moving toward renewable fuels as a source of energy, but our primary focus should be on the resources we are squandering. We are using the rotational energy that is not used by automobiles. The energy is transformed into electricity and stored in the battery while the car is driving (wheel rotating). It's accomplished by combining a gear and a generator. We'll provide power from that battery while the car (engine) is switched off. We can save money on fuel by doing so, and we can take advantage of rotational motion. It can be used in traditional vehicles, hybrid cars, and electric cars. We may increase the distance (mileage) that an e-car travels. This project would be a watershed moment in the car industry if it succeeds. We must reuse the resources that are not being used in order to maintain our resources for future generations. We can break the use of the loads by using two batteries, so that when the engine is running, the load will run on one battery and when the engine is off, the load will run on the other battery, extending the battery's life and improving the car's performance.

Keywords: Energy Conservation Law, Regenerative Power System, Arduino, DC Motor, Car, 4-Wheeler

| DOI: 10.17148/IJIREEICE.2021.9317