Abstract: An elongate composite beam 26 for securing or anchoring a solar array 10. The beam 26 comprising a hollow outer shell 28 formed from a C-section beam that has a closed end wall 30, a pair of side walls 32, and end wall sections 34, 36 that extend inwardly towards each other from ends of the side walls 32. Opposed ends of the end wall sections 34, 36 are spaced apart to define an elongate gap G. The closed end wall 30, the side walls 32 and the end wall sections 34, 36 define a shell interior. At least one of the end wall sections 34, 36 comprises an inwardly extending lip 38, 40 that extends in a direction towards the closed end wall 30 inwardly into the shell interior. The shell interior is substantially filled with a settable material 42 which engages about the inwardly extending lip 38, 40.