Uninterruptible Power Supply Using Solar Rechargeable Battery

Problem statement: A 600 watts Uninterruptible Power Supply (UPS) that consists of an inverter operated with solar rechargeable battery has been constructed and characterized. Approach: An inverter of high switching frequency and high power handling, a sensor, an oscillator and other electronic devices were employed in the circuitry. Performance tests involved measurements of supply currents and voltages from the battery to the inverter and the inverter output currents and voltages under varying applied load conditions and various power ratings of 12 volts feed battery. Results: Results showed that a threshold battery capacity of 12 volts 62 A/H is required to sustain a steady voltage output of 220-240 volts for hours depending on the external load. Internal control switching and rectifier systems also allow the use of mains supply when available. Conclusion: The system provides a standby power source to overcome disruption of work in progress due to power failure.