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 (11a, 11b, 12a, 12b), wherein the second side of the first post faces the first side of the second post, and ∘ comprising a first and a second aperture (111, 112, 121, 122) 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 (200, 210), wherein: ∘ the first beam of the first pair of beams extends through the first aperture (31, 111) 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 (31, 121) of the second post; - a second pair of beams (300, 310), wherein: ∘ the first beam of the second pair of beams extends through the second aperture (31, 112) 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 (31, 122) 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; wherein the apertures comprise guiding wings along the edge of the aperture adapted to contact and support the beam hung in the aperture. - at least a first post and a second post, each of said posts ∘ having a first and a second, mutually opposed, side (11a, 11b, 12a, 12b), wherein the second side of the first post faces the first side of the second post, and ∘ comprising a first and a second aperture (111, 112, 121, 122) 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 (11a, 11b, 12a, 12b), wherein the second side of the first post faces the first side of the second post, and ∘ comprising a first and a second aperture (111, 112, 121, 122) 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 (200, 210), wherein: ∘ the first beam of the first pair of beams extends through the first aperture (31, 111) 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 (31, 121) of the second post; ∘ the first beam of the first pair of beams extends through the first aperture (31, 111) 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 (31, 121) of the second post; - a second pair of beams (300, 310), wherein: ∘ the first beam of the second pair of beams extends through the second aperture (31, 112) 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 (31, 122) of the second post; ∘ the first beam of the second pair of beams extends through the second aperture (31, 112) 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 (31, 122) 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;