Design and Development of a Multi-Input Alternative Power Source for Emergency Purposes

This study designed and developed a multi-input alternative power source intended for emergency purposes, integrating solar, hand-crank, and AC inputs. The system was constructed to provide reliable backup energy in contexts where power disruptions compromise safety and disaster preparedness. Methodological steps included system design, component selection, circuit integration, and testing under controlled conditions. Performance results indicated that the solar input charged a 12V battery to 80% capacity within 3.5 hours, while the hand-crank produced 5V at an average of 7 W with continuous operation, supporting LED lighting for approximately 6 hours. AC charging achieved full capacity within 2.5 hours, demonstrating efficiency when grid access was available. Comparative testing confirmed that the multi-input approach enhanced flexibility and reliability compared to conventional single-source emergency power devices. Limitations of the study involved short-term testing and environmental dependency. Practical recommendations include extending solar capacity, improving ergonomic hand crank design, and conducting long-term field validation. The findings highlight the potential of portable, multi-input renewable systems as cost-effective and adaptable solutions for disaster readiness and educational applications.