Abstract
Energy monitoring systems are being reported on more and more as consumers wish to determine the amount of energy produced and used by various renewable energy systems. Added to this is improving the overall systems’ efficiency and identifying any potential concerns. The purpose of the paper is to show the importance of correctly calibrating such energy monitoring systems on a regular basis, in order to validate any future measurements as being reliable. In this study, three 10 W PV modules are used with their own respective LED loads to extract the maximum possible amount of electrical energy during the day. No storage systems are used due to their limited life-cycle and variability. An Arduino microcontroller is used as the data logging interface between the PV systems and a PC running Lab VIEW software, which acts as the visual interface and recording system. Calibration is done in Lab VIEW to account for system losses. Results indicate that three identical PV systems can be calibrated to produce the same results, with variability of less than 1%. Higher variabilities point to inconsistencies in the PV modules, even if they originate from the same manufacturer. A key recommendation is to perform an annual calibration of the monitoring system, which primarily accounts for PV module degradation.
Publisher
World Energy and Environment Technology Ltd - WEENTECH
Reference26 articles.
1. 1] N. Guler and E. Irmak, (2017). Design, implementation, and verification of computer interactive parallel connection system with load-sharing control for synchronous generators. Electrical Engineering. 99, 1, 241-263.
2. [2] P. E. Hertzog and A. J. Swart, (2015). A customizable energy monitoring system for renewable energy systems. presented at SAUPEC 2015, University of Johannesburg.
3. [3] A. J. Swart and P. E. Hertzog, (2016). Verifying an economic viable load for experimental purposes relating to small scale PV modules. presented at SATNAC 2016, Fancourt, George, Western Cape. ISBN: 978-0-620-72418-0.
4. [4] A. J. Swart and P. E. Hertzog, (2017). LED’s as viable power loads for experimental purposes relating to PV modules in pico-solar systems. presented at ICETAS 2017, AMA International University Bahrain, Bahrain.
5. [5] P. E. Hertzog and A. J. Swart, (2015). Determining the optimum tilt angles for PV modules in a semi-arid region of South Africa for the summer season. presented at SATNAC 2015, Arabella, Hermanus, Western Cape.