Fastening system for fastening solar modules

A fastening system including a plurality of fastening modules to mount a framed solar module having a first longitudinal direction on a roof structure or a façade, the roof structure or façade each having a second longitudinal direction, wherein each fastening module comprises:

• one module carrier mountable on the roof structure or on the façade;
• a slide block guidable inside the module carrier and comprising a base body having a region extending above the module carrier and presenting a side surface;
• a module clamp;
• and
• a fastener to connect the module clamp to the slide block to clamp the framed solar module between the module clamp and the slide block;
• wherein the module clamp is rotatable between two positions on the fastener so that an arrangement of the fastening modules permits the framed solar module to be mounted on the roof structure or the façade with the first longitudinal direction of the framed solar module being perpendicular or parallel to the second longitudinal direction of the roof structure or facade, and wherein when the framed solar module is mounted with the first longitudinal direction of the framed solar module perpendicular to the second longitudinal direction of the roof structure or facade, the slide block is arranged at a lower edge of the framed solar module and the side surface of the slide block contacts a side edge of the framed solar module to form an anti-slip protection with the slide block and the framed solar module.