Annual available solar resource is dependent on global horizontal irradiation (GHI) and PV systems. Relevant tracking and non-tracking PV systems are presented based on Hay-Davis-Klucher-Reindl (HDKR) approach. Results of the analysis are shown for all PV systems and all regions in the world. Solar resources are weighted by global population distribution, regarded per country, continent and region and compared to area weighted, maximum and minimum irradiation per geographic entity. Global electricity weighted irradiation for fixed optimally tilted PV systems is about 1,690 kWh/m²/y, significantly less than global population and area weighted irradiation of about 1,850 and 1,780 kWh/m²/y, respectively.
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Breyer et al. (2010) studied this question.
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