Energy efficiency of solar batteries under real operating conditions

Abstract

At the present time solar energy-electricity conversion systems are widely used. Solar energy is widely available while possessing unlimited resources. This direction is the most promising and rapidly developing branch of the environmentally friendly renewable energy sources creation. The main aim of the study. Within the framework of comparing the features of the batteries of various manufacturers under actual operating conditions at the Department of renewable energy sources in Baden-Wurttemberg Cooperative State University, Department of Engineering, Campus Friedrichshafen the authors have designed and realized the system complex PRS which allows analyzing energy efficiency of the fixed, stationary elements with the elements being placed on the platform of the dual-axis system of the sun standing angle auto-tracking. The methods used in the study. The investigations were carried out with the use of Solarlog and SolarEdge systems which allow reading, processing and storing measurement data directly from the respective photovoltaic cells. The data were processed and verified in MathCAD and MS Excel environments. The authors used the methods of information statistical processing. The results: The results obtained for the period of January-March 2014 allowed considering the efficiency of operation of the solar cell batteries of different manufacturers and evaluating the advantage of placing solar panels on a biaxial system with automatic tracking angle and elevation («DEGERtraker 5000HD») compared to a fixed, stationary system. The influence of shading effects on the fixed modules is demonstrated. In conclusion, the authors obtained the estimates of electricity cost, summarized the results of statistical data processing.

Keywords

• renewable energy sources
• photovoltaic solar battery
• output power
• power efficiency
• electricity charges
• solar energy