Study on improvement of solar module making procedure and efficiency enhancement of off-grid solar power system

Abstract

The decrease in the curing time of ethylene vinyl acetate (EVA) as a result of thermal treatment at high temperature effectively enables solar module production and reduces the module cost below 1.0 USD/Wp. As consequence, the possible minimum electricity cost in the case of the grid-tie solar system with medium illumination could be below 0.15 USD/ kWh, which is comparable to that of normal grid. With respect to off-grid solar system, the overall efficiency is mainly relied to the storage stage. A programmed bypass conection set up in a small off- grid solar system based on specific load has improved the efficiency, brought the electricity cost of the small off-grid system closer to that of the grid-tie system.