A frame for a vertical solar system, the frame comprising: - at least a first post and a second post , each of said posts ∘ having a first and a second, mutually opposed, side , wherein the second side of the first post faces the first side of the second post , and ∘ comprising a first and a second aperture from the first to the second side through the post, wherein in vertical direction the first aperture is situated lower than the second aperture; - a first pair of beams , wherein: ∘ the first beam of the first pair of beams extends through the first aperture of the first post , thereby providing a first projection at the second side of the first post , and ∘ the second beam of the first pair of beams extends through the first aperture of the second post ; - a second pair of beams , wherein: ∘ the first beam of the second pair of beams extends through the second aperture of the first post , thereby providing a second projection at the second side of the first post , and ∘ the second beam of the second pair of beams extends through the second aperture of the second post ; wherein at the second side of the first post : ∘ the second beam of the first pair of beams is supported by the first projection , and ∘ the second beam of the second pair of beams is supported by the second projection . - at least a first post and a second post , each of said posts ∘ having a first and a second, mutually opposed, side , wherein the second side of the first post faces the first side of the second post , and ∘ comprising a first and a second aperture from the first to the second side through the post, wherein in vertical direction the first aperture is situated lower than the second aperture; ∘ having a first and a second, mutually opposed, side , wherein the second side of the first post faces the first side of the second post , and ∘ comprising a first and a second aperture from the first to the second side through the post, wherein in vertical direction the first aperture is situated lower than the second aperture; - a first pair of beams , wherein: ∘ the first beam of the first pair of beams extends through the first aperture of the first post , thereby providing a first projection at the second side of the first post , and ∘ the second beam of the first pair of beams extends through the first aperture of the second post ; ∘ the first beam of the first pair of beams extends through the first aperture of the first post , thereby providing a first projection at the second side of the first post , and ∘ the second beam of the first pair of beams extends through the first aperture of the second post ; - a second pair of beams , wherein: ∘ the first beam of the second pair of beams extends through the second aperture of the first post , thereby providing a second projection at the second side of the first post , and ∘ the second beam of the second pair of beams extends through the second aperture of the second post ; wherein at the second side of the first post : ∘ the second beam of the first pair of beams is supported by the first projection , and ∘ the second beam of the second pair of beams is supported by the second projection . ∘ the first beam of the second pair of beams extends through the second aperture of the first post , thereby providing a second projection at the second side of the first post , and ∘ the second beam of the second pair of beams extends through the second aperture of the second post ; ∘ the second beam of the first pair of beams is supported by the first projection , and ∘ the second beam of the second pair of beams is supported by the second projection . <EOS>