2006 Volume 126 Issue 11 Pages 1135-1141
This paper reports an output lower property when spot dirt adheres to a small photovoltaic module. It was used the small photovoltaic module of 13W applied to various electric systems. The module consists of 34-cells, cut to 1/4 the silicon single crystal photovoltaic cell of the square whose one side is 103mm. It was found that the photovoltaic output power is reduced by 50% due to a 3% dirt area on the small module. We also showed clearly that the decrease of output power able to improve about 20% by changing photovoltaic cell shape to rectangle.