Map missing. Insets: Figure 1. Annual average solar irradiance (horizontal plane)(kWh/m2 per year) . - Figure 2: Structure and operation of a solar cell. Figure 3: Solar hot water system. - Figure 4: Schematic representation of a solar installation. Figure 5: Typical collectors used in solar thermal energy conversion. Picture: A solar furnance at Odeillo in the French Pyrenees.