Mounting system (100) for installing a photovoltaic (PV) module (12) in a south orientation or, in a double arrangement, in a pitched roof-like east-west orientation on a roof (14), in particular on a flat roof, said An assembly system (100) comprising: a base rail (16; 16) having a in its longitudinal direction (Y) extending, preferably one-sided, open receiving groove (32) by side walls (34, 36; 34 '', 36 '') is defined; a holding rail (102) having a base leg (110), a support leg (112) and a Einsteckschenkel (113), wherein the retaining rail (102) without tools with its base leg (110) positively into the receiving groove (32) of the base rail (16 16 ') can be inserted, so that the support leg (112) protrudes from the receiving groove (32); and at least one clip (26) which can be plugged onto the base rail (16, 16 ') from the outside in such a manner that the side walls (34, 36) can no longer be bent outwards in order to secure the inserted retaining rail (102) in the base rail (16; 16 ') permanently fix.
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