抄録
Estimation of global solar radiation from photovoltaic generation was examined using a dataset of pyranometer and solar panel. The solar panel was equipped horizontally and then tilted at an angle of 20o. In the case of horizontally equipped solar panel, the photovoltaic generation was proportional to global solar radiation and once a calibration parameter was attained using one day in one season, solar radiation estimated from photovoltaic generation using the parameter highly agreed with measured data in other days with correlation more than 0.99. The good performance was not only fair weather days but also for other cloudy days. But the calibration parameter was not universal over other seasons. This is probably due to the difference of solar elevation and/or shade effect. In the case of tilted solar panel, the simple conversion resulted in worse and it was demonstrated that the conversion using direct/scatter separation improved the estimation where the correlation is 0.99. The estimation provided in this study is promising for monitoring of spatial and temporal variation of short wave radiation, because solar panel has been already equipped to a lot of houses and commercial, industrial, and public buildings and the generation data can be easily online-based available.
