The photovoltaics applied to the exterior wall of buildings is one of the elemental technologies of Net-zero Energy Buildings. The purpose of this study is to acquire the amount of solar radiation and power generation in eight vertical exterior wall sides, such as south, south-west, west, north-west, north, north-east, east and south-east directions, and to clarify the rate at the time of comparing with the horizontal surface or a 30-degree south slope. The observation system installed on the roof top of the building which locates in Hakusan-shi, Ishikawa prefecture is used for observation.
