“…Furthermore, due to the outstanding growth of technologies targeted at 3 deploying the potential of solar energy for electricity production (IEA, 2012;IEA, 2014: Executive Summary) as an abundant renewable resource (Szuromi et al, 2007); Burnett et al (2014); Sarralde et al (2015)), a large number of studies (Fernández-Peruchena & Gastón, 2016;McCandless, Haupt & Young, 2015;Zell, 2015;Sundaram & Sarat Chandra Babu, 2015;Pierro et al, 2015;Pedro & Coimbra, 2015;Zempila et al, 2016a;Kashyap, Bansal & Sao, 2015;Lopez et al, 2001) have proposed many methods to derive the GHI that is exploited in Photovoltaic systems (PV) (Salas et al, 2009), and to assess, map, validate and predict its abundancy worldwide.…”