Positive installation and side installation optional photovoltaic system

The utility model discloses a photovoltaic system with selectable forward installation and side installation, which comprises photovoltaic panel units, supports, forward installation fasteners and side installation fasteners, the supports are arranged at intervals, the photovoltaic panel units are borne on the supports, and the forward installation fasteners and the side installation fasteners are arranged on the supports. When the installation condition between the photovoltaic panel unit and the support allows forward installation operation, the forward installation fastener forwardly presses the photovoltaic panel unit from the upper portion of the photovoltaic panel unit and is connected with the support in a fastened mode. And when the installation condition between the photovoltaic panel unit and the bracket does not allow the forward installation operation, the side-mounted fastener is connected with the photovoltaic panel unit from the lower part of the photovoltaic panel unit and is fixedly connected