TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The base support body is rod-shaped or U-shaped and/or an underlying surface plate-like mandrel collectable with its lower side into the substrate. The edge of the plate-like underlying surface is curved shell-like vertically upwardly. The rod-shaped base support body has an external thread in at least one head-side portion, which aligns with a central hole with an internal thread, which is arranged between the respectively opposite edges of the supporting plate. The attachment sites are spaced apart between the respective supporting plate and the respective base support body of a first base support and a second base support of the pair of the base support, in the mounted state, which is represented by av2 is equal to av1+ahx tan alpha , where av1 is the relatively small vertical distance of the connecting point of the first base support to the substrate, av2 is the relatively large vertical distance of the attachment point of the second base support to the substrate, ah is the horizontal distance between the attachment points of the pair of the base supports, and alpha is the angle of inclination. The supporting plate of the first base supports of the pair of the base supports is provided for the edge of at least one photovoltaic module and at opposite sides respectively includes an edging pointing upwards at an angle. The supporting plate for the edge of at least one photovoltaic module is provided at the head end of the second base supports of the pair of base supports, which at opposite sides respectively exhibits an edging facing downwardly at an angle, where the substrate surface and the supporting plate of each base supports are connected with each other via the base support body. The supporting plates are manufactured from a flexible material. A torsion caused by differing penetration of the base support in the substrate is incorporated within the respective supporting plate. The lower side of the substrate surface is provided with an anti-slip structure, and/or a loading weight is provided on the substrate surface. Each supporting surface is provided with a threaded hole for receiving a module clamp and is provided with a centering pin, which faces upwardly, which is provided and adapted to intervene a congruent notch in a frame of the photovoltaic module, in the mounted state. The distance between the substrate surface and the supporting plate is 30-100 cm, preferably 50-60 cm. The supporting plates comprise a supporting structure, which is provided and adapted to interlock with a complementary counter-structure, which is present on the lower side of the photovoltaic module, in the mounted state. The supporting plates are provided and adapted to hold the photovoltaic module by adhesive bonding or clamp fixing. The supporting plates comprise a pad in at least one corner region, where the size of the supporting plates is dimensioned, such that in the mounted state the pad is completely located under a mounted photovoltaic module. The rows of the first base supports are staggered at the rows of the second base supports, such that each photovoltaic module is mounted on three supporting plates in case of mounted photovoltaic modules with the exception of the edging-side of the photovoltaic modules.