O. M. EDOHEN

This project focuses on the design and implementation of an automatic changeover system integrated with contactors and an Automatic Voltage Regulator (AVR) for efficient management of a home solar power system. The system is designed to automatically transfer load supply between the solar inverter, utility grid, and generator in the event of power failure or voltage instability, ensuring uninterrupted power delivery to essential household appliances. The control unit employs electromechanical contactors to achieve seamless source selection, while an AVR maintains stable voltage output to prevent damage to sensitive equipment. A timer/delay relay is incorporated to coordinate the switching process, minimize transient currents, and delay the operation of the alarm siren to prevent false triggers during short interruptions. The project also integrates protective circuit breakers to safeguard the system from overloads and short circuits, improving safety and reliability. The overall design emphasizes efficiency, automation, and simplicity, eliminating the need for manual intervention during power transitions. Testing and evaluation were carried out under various load conditions to verify performance. Results confirmed that the system achieves reliable source transfer, stable voltage regulation, and reduced downtime during source changeovers. The project demonstrates a practical and cost-effective solution for domestic solar power management, promoting energy efficiency and dependable power supply in areas with unstable grid systems.