Reference is now made to FIG. 1 showing a prior art geometry of tilted solar modules of a solar-array module 100, tilted at an angle β. In this example, solar-array module 100a and 100b are disposed on a substantially horizontal surface, wherein solar-array module 100a is positioned in front of solar-array module 100b, with respect to the sun. When the sun is at a pitch angle of α above the horizon, solar-array module 100a having a length l, casts a shadow on the ground surface with a displacement of d. No shadow is cast over solar-array module 100b. But, when the sun is at a lower pitch angle than α, such as α₂, solar-array module 100a casts a shadow over the lower section of solar-array module 100b. In this example, solar-array module 100a casts a shadow on the region delimited between P₀ and P₂ of solar-array module 400b, while only the solar cells disposed between P₂ and P₁ produce electric power.