Influences of Solar Incident Angle on Power Generation Efficiency of PV Modules under Field Conditions

Abstract

In this report, we examined influences of solar incident angle on the power generation efficiency of photovoltaic (PV) modules based on a measurement, during winter, at Kagoshima in Japan (31.570˚N, 130.545˚E). It was indicated that the power generation efficiency of PV modules deteriorates with time depending on the solar incident angle, and that there are cases where the power generation efficiency sharply drops if the incident angle exceeds 60˚ and the reflectance of cover glass exceeds 0.2. Such drop of power generation efficiency dependent on incident angle clearly appears at clear time when the proportion of direct components of solar radiation increases. Furthermore, it was pointed out that the average value of power generating efficiency during winter including all weather conditions produces differences of 10% or so, depending on the difference of average value during the period of incident angle.

Efficiency comparison between tracking and optimally fixed flat solar collectors

“…In this paper we do not consider the impact of irradiation incidence angle on the characteristics of solar energy conversion. As an example, the efficiency of solar PV panels are affected by the angle at which the solar rays hit the panel 40 – 42 or in solar concentrators, diffusive irradiation cannot be harvested. This important and challenging problem requires further investigation.…”

Effects of the Temperature on the Output Voltage of Mono-Crystalline and Poly-Crystalline Solar Panels

“…Since Indonesia is located on the equatorial line, Indonesia needs to take advantage of its solar energy potential [11,12,13]. Not only is solar panel efficiency determined by its materials [14,15,16], it is also determined by the sunlight's direction [17] [18], and the solar panel's temperature [19] [20]. The electricity generation on a solar panel can be optimized by improving one of those three factors.…”