A portable PV module array comprising: at least four planar PV modules (11,12) which are of generally square or rectangular configuration so that each PV module (11, 12) defines a generally square or rectangular edge of substantially the same dimensions and comprising a pair of substantially parallel end edges (13, 14, 15, 16) and a pair of substantially parallel side edges (17, 18), the PV modules (11, 12) being connected along adjacent end edges (14, 15) and being foldable relative to each other about the connected end edges (14, 15) between a closed condition and an open condition, whereby: in the closed condition, the PV modules (11, 12) are stacked together in a generally parallel and close facing relationship with the edges of the PV modules (11, 12) in general alignment, and in the open condition, the PV modules (11, 12) are disposed at an angle (β) to each other so that the PV module array defines a triangular configuration in which the PV modules (11, 12, 30, 31) are connected in a series of alternating peaks and troughs, characterised in that foldable movement of the PV modules (11, 12) from the closed condition to the open condition is restricted against movement beyond the open condition by a flexible connector that connects with a connection point (23,24) associated with each of the PV modules (11, 12) of the PV module array at the troughs of the PV array and that is tensioned in the open condition and that is slack in the closed condition. at least four planar PV modules (11,12) which are of generally square or rectangular configuration so that each PV module (11, 12) defines a generally square or rectangular edge of substantially the same dimensions and comprising a pair of substantially parallel end edges (13, 14, 15, 16) and a pair of substantially parallel side edges (17, 18), the PV modules (11, 12) being connected along adjacent end edges (14, 15) and being foldable relative to each other about the connected end edges (14, 15) between a closed condition and an open condition, whereby: in the closed condition, the PV modules (11, 12) are stacked together in a generally parallel and close facing relationship with the edges of the PV modules (11, 12) in general alignment, and in the open condition, the PV modules (11, 12) are disposed at an angle (β) to each other so that the PV module array defines a triangular configuration in which the PV modules (11, 12, 30, 31) are connected in a series of alternating peaks and troughs, characterised in that foldable movement of the PV modules (11, 12) from the closed condition to the open condition is restricted against movement beyond the open condition by a flexible connector that connects with a connection point (23,24) associated with each of the PV modules (11, 12) of the PV module array at the troughs of the PV array and that is tensioned in the open condition and that is slack in the closed condition. in the closed condition, the PV modules (11, 12) are stacked together in a generally parallel and close facing relationship with the edges of the PV modules (11, 12) in general alignment, and in the open condition, the PV modules (11, 12) are disposed at an angle (β) to each other so that the PV module array defines a triangular configuration in which the PV modules (11, 12, 30, 31) are connected in a series of alternating peaks and troughs, characterised in that foldable movement of the PV modules (11, 12) from the closed condition to the open condition is restricted against movement beyond the open condition by a flexible connector that connects with a connection point (23,24) associated with each of the PV modules (11, 12) of the PV module array at the troughs of the PV array and that is tensioned in the open condition and that is slack in the closed condition.