DESIGN AND CONSTRUCTION OF 1.8KVA PURE SINE WAVE HYBRID POWER INVERTER
Abstract
ABSTRACT
The persistent instability of electrical power supply in many developing regions has intensified the demand for alternative and reliable energy solutions. One such solution is the inverter system, which converts stored direct current (DC) energy into usable alternating current (AC) electricity. This project focuses on the design and construction of a 1.8 kVA pure sine wave hybrid power inverter capable of delivering stable and efficient power for residential and small-scale commercial use.
Unlike conventional square-wave or modified sine wave inverters, the pure sine wave inverter generates an AC output waveform closely resembling that of utility grid electricity. This feature makes it suitable for sensitive electronic equipment such as computers, televisions, medical devices, and communication systems. The hybrid capability allows the inverter to integrate multiple energy sources including batteries, solar panels, and grid power.
The design incorporates several major functional units including the power supply stage, oscillator circuit, pulse-width modulation (PWM) control system, MOSFET switching stage, step-up transformer, filtering network, and protection circuitry. These units operate together to ensure efficient DC-to-AC power conversion while maintaining system stability and output waveform purity.
During the construction process, careful component selection and circuit optimization were carried out to ensure high efficiency, minimal harmonic distortion, and reliable performance. The completed inverter system was tested under various load conditions to evaluate its efficiency, voltage stability, waveform quality, and thermal characteristics.
The results demonstrate that the developed inverter successfully produces a stable 220–240 V pure sine wave output with a capacity of approximately 1.8 kVA, making it capable of powering typical household appliances. The hybrid architecture also enhances system flexibility by allowing seamless integration with renewable energy sources.
This project therefore contributes to the development of sustainable and reliable backup power systems while also providing practical insight into inverter design and power electronics engineering.
Full-Text Access Notice
In accordance with the NERD Policy on promoting peer-reviewed publication, public access to the full text of a project, thesis or dissertation is restricted for three years, allowing the author and supervisors sufficient time to pursue peer-reviewed publication.
During this period, researchers with legitimate academic or research purposes may request authorisation directly from the author to enable NERD to release the indexed full texts of the work using the form below.