THE DESIGN AND CONSTRUCTION OF A 1.5 KVA, 12 V, 120AH ELECTRICITY CHARGED INVERTER SYSTEM
Abstract
Inverter systems are crucial backup solutions to the erratic power supply common in developing countries. This project focuses on the design and construction of a 1.5 kVA, 12 V, 120 Ah electricity-charged inverter system capable of converting DC power from a battery into a stable 220 V AC output for powering household appliances. The system was built around three major modules: a battery charging unit, an inverter oscillation and amplification stage, and the load output with protection circuits. A 12 V/120 Ah deep-cycle battery, MOSFET-based switching, and a center-tapped transformer were employed to achieve the inversion process. The system was tested across various load conditions ranging from no-load to 700 W, with parameters such as output voltage, efficiency, and runtime monitored. Results showed that the inverter provided relatively stable voltage across moderate loads, though voltage drops occurred under high inductive loads due to transformer losses and switching inefficiencies. Overall, the system demonstrates a cost-effective, locally fabricated alternative suitable for residential and small office use, with recommendations for future work including pure sine wave generation, automatic voltage regulation, and enhanced battery management systems.
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