Three environmental factors of irradiance, solar spectral irradiance distribution and module temperature greatly affect the performances of photovoltaic (PV) modules. So energy rating given by an actual electrical energy generated by PV modules is appropriate for the rating of PV modules. However, energy rating is complicate because energy rating needs actual operation data of PV modules and environmental factors where the PV modules are installed. Thus, we focused on basic meteorological data (BMD) announced by Japan Meteorological Agency (JMA). If the environmental factors can be estimated from the BMD announced by meteorological observatory in each region, the performance of PV modules in each region can be estimated easily. In this study, the performances of PV modules were estimated from the estimation of the occurrence rate of environmental factors from BMD in each region. To estimate the occurrence rate of the environmental factors in each region from the BMD, a relationship between hourly measured BMD and environmental factors were analyzed. Here, the measurement data in 2005 year at Kusatsu city, Shiga prefecture, Japan (34°58'N, 135°57'E) was used. The occurrence rate of the environmental factors from 2005 to 2007 year in Shiga prefecture each year was estimated by hourly BMD. The BMD announced by the meteorological observatory at Hikone city (35°17'N, 136°15'E) and the relationship the BMD and the environmental factors were used to this estimation. Hikone city is environs of Kusatsu city. Furthermore, the weighted means of performances of bulk type (multi-crystalline Si (mc-Si)) and thin-film type (a-Si/micro-crystalline Si (Tandem)) PV modules were calculated by the estimated occurrence rate of the environmental factors. As a result, errors between the estimation and actual performances in the mc-Si module and Tandem in 2005 were within 0.5%. This methodology can be useful for the rating of the performance of PV modules in Shiga prefecture.
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