NOVELTY - The system has a set of fastening devices (30) for securely fastening solar panels (S) to mounting members (20) i.e. mounting rail. Each fastening device includes a clip (31) for clipping or making snap-fit attachment to one of the mounting members. A clamping member (41) is provided on or carried by the clip for engaging with an edge region (E) of the solar panel, where the clamping member is constructed to be biased or pressed based on the clip to clamp and securely hold the solar panel in position on the mounting member.    USE - System for mounting an array of photovoltaic solar panels on a support structure i.e. roof, in a form of tiles, corrugated sheeting i.e. galvanized or coated steel sheeting, and synthetic i.e. plastic, sheeting.    ADVANTAGE - The mounting system includes capping rails so as to ensure integrity and continuity of rainwater run-off and drainage, so that the solar panel array can effectively function as a part of building envelope. The capping rails directs rainwater to the upper surface of the solar panel onto the upper surface of an adjoining panel in the array, and prevents ingress or penetration of the water between the adjoining transverse edge regions of the solar panels by covering and sealing regions of the array, so that unwanted infiltration of the rainwater, snowmelt or condensate into the roof cavity or roof structure is essentially inhibited. The system includes seating elements that can be combined with the mounting rails according to a pre-assembly procedure, so that installation of the solar panel array performed on the roof is simplified for a person carrying out the installation, thus minimizing risk to health and safety of the person performing the installation, bystanders in vicinity and the risk of damage to the solar panels during the installation procedure.    DETAILED DESCRIPTION - The clip is formed by metal i.e. aluminum.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of an end of a mounting member in a mounting system.    Edge region (E)    Solar panels (S)    Mounting members (20)    Fastening devices (30)    Clip (31)    Clamping member (41)