A connecting device (200, 300, 400) for connecting at least one external electrical conductor to an electrical connection system (3, 104) of a photovoltaic solar module, comprising: - a plurality of individually assembled busbars arranged next to one another, comprising at least a first busbar with a first contact zone for connection to the electrical conductor and a second contact zone for connection to the electrical connection system of the solar module, and a second busbar with a contact zone for connection to the electrical connection system of the solar module, - at least one support element, to which the busbars are attached, and which comprises a bottom face by way of which the support element may be arranged on the solar module by being placed onto the solar module, - an overhousing (10, 60) arrangeable separately from the support element, which overhousing (10, 60) may be arranged over the support element and the busbars and comprises at least one edge (15, 65) surrounding the support element and the busbars in this arrangement, which may be arranged on the solar module by being placed onto the solar module and may be sealingly connected to the solar module, - having at least one diode component fitted onto the busbars (21, 22) and having diode leads, which are in each case fitted onto one of the busbars (21, 22) and connected to the respective busbar (21, 22), such that the first and second busbars are connected together via the diode component, characterized in that the support element is formed of a plastics housing, which encloses at least part of the busbars and the diode component, so forming a functional unit, and - the connecting device having at least one contact, which is configured in a first zone for connection with the first contact zone of the first busbar and which is configured in a second zone for connection with the external electrical conductor. - a plurality of individually assembled busbars arranged next to one another, comprising at least a first busbar with a first contact zone for connection to the electrical conductor and a second contact zone for connection to the electrical connection system of the solar module, and a second busbar with a contact zone for connection to the electrical connection system of the solar module, - at least one support element, to which the busbars are attached, and which comprises a bottom face by way of which the support element may be arranged on the solar module by being placed onto the solar module, - an overhousing (10, 60) arrangeable separately from the support element, which overhousing (10, 60) may be arranged over the support element and the busbars and comprises at least one edge (15, 65) surrounding the support element and the busbars in this arrangement, which may be arranged on the solar module by being placed onto the solar module and may be sealingly connected to the solar module, - having at least one diode component fitted onto the busbars (21, 22) and having diode leads, which are in each case fitted onto one of the busbars (21, 22) and connected to the respective busbar (21, 22), such that the first and second busbars are connected together via the diode component, - the connecting device having at least one contact, which is configured in a first zone for connection with the first contact zone of the first busbar and which is configured in a second zone for connection with the external electrical conductor.