International Journal of Scientific Research and Engineering Development

A Watt Wallet system presents a smart prepaid electricity metering solution that integrates embedded control, automation, and mobile communication technologies. The prototype monitors real-time energy consumption, manages prepaid credits, and performs automatic load control based on user balance. Bluetooth-enabled mobile applications allow users to view balance, recharge credit, and receive low-credit alerts. The system features dual operating modes, Residential/Commercial and EV Charging, each operating under separate tariff rates. When the prepaid balance reached zero, the solid-state relay (SSR) disconnected the load automatically, ensuring controlled power management. In emergency conditions, a reset button temporarily restores power to maintain essential usage. The experimental results confirm accurate measurement, reliable operation, and efficient user interaction through the mobile interface, making Watt Wallet a cost-effective and scalable solution for modern smart energy management systems.