Visualising the effect of different tilt angles on the switch-on time of small PV modules using a simplified measuring approach

Abstract

Renewable energy systems are receiving more and more attention, as governments and industry seek to reduce fossil fuel usage and provide more clean energy. PV systems fall into this category, and are especially sought after in countries that enjoy sufficient annual solar radiation. It has been scientifically proven that both the tilt and orientation angles, along with variable atmospheric conditions, impact significantly on the optimum output power of PV modules used in these systems. The purpose of this paper is to present a simplified measuring approach to validate this fact when considering the tilt angle. Research is not always about discovering new aspects, but also involves using various scientific methods to test and retest current findings. This simplified measuring approach is a re-test of current findings that indicates that a PV module with a high tilt angle starts operating earlier than a PV module with a lower tilt angle for winter periods in South Africa. However, the simplified approach costs less than 25% of traditional measuring approaches, providing a visual dimension and perspective in validating current research findings.