Аннотация
Yearly sum of global irradiation is compared from six spatial (map)
databases: ESRA, PVGIS, Meteonorm, Satel-Light, HelioCliom-2, and
NASA SSE. This study does not identify the best database, but in
a relative cross-comparison it points out to the areas of higher
variability of outputs. Two maps are calculated to show an average
of the yearly irradiation for horizontal surface together with the
standard deviation that illustrates the combined effect of differences
between the databases at the regional level. Differences at the local
level are analysed on a set of 37 randomly selected points: global
irradiation is calculated from subset of databases for southwards
inclined (at 34°) and 2-axis tracking surfaces. Differences at the
regional level indicate that within 90% of the study area the uncertainty
of yearly global irradiation estimates (expressed by standard deviation)
does not exceed 7% for horizontal surface, 8.3% for surface inclined
at 34°, and 10% for 2-axis tracking surface. Higher differences
in the outputs from the studied databases are found in complex climate
conditions of mountains, along some coastal zones and in areas where
solar radiation modelling cannot rely on sufficient density and quality
of input data.
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