The invention concerns a panel box, for the electrical connection of a photovoltaic module for a solar installation, with a base piece (1) for mounting on the photovoltaic module and for the electrical connection of a connection line of the photovoltaic module, and with another part for placement on the base piece (1). According to the invention, the other part is designed as a functional part (2), having at least one functional device performing an electrical and/or electronic function. This provides a panel box which is easy to install and, what is more, it enables an easy replacement of a defective component in event of a fault.