Photovoltaic module array and photovoltaic system

The utility model discloses a photovoltaic module array and a photovoltaic system, relates to the technical field of photovoltaic modules, and is used for avoiding the hot spot effect of the photovoltaic modules and avoiding the phenomenon of water leakage between two mutually lapped photovoltaic modules. The photovoltaic module array comprises a connecting mechanism and a plurality of photovoltaic modules, the corners of the adjacent photovoltaic modules arranged in the first diagonal direction of the photovoltaic modules are in lap joint through the connecting mechanism, and the adjacent photovoltaic modules arranged in the second diagonal direction of the photovoltaic modules are arranged at intervals. In the two photovoltaic modules of which the edges are mutually lapped, the distance between the light receiving surface of the upper photovoltaic module and the light receiving surface of the lower photovoltaic module is H, and the distance D1 between the edge of the battery piece layer of the lower photovo