A method for determining a solar mask for a closure, shading or solar protection installation, the method being carried out by means of a mobile terminal, the mobile terminal comprising at least: - a controller, - a photographic instrument, and - an orientation detection device, the method comprising at least the following steps: - positioning the mobile terminal at a predetermined location of a photovoltaic panel of an autonomous electrical energy supply device, the autonomous electrical energy supply device being configured to supply an electromechanical actuator of a motorized drive device with electrical energy, in an assembled configuration of the installation, - after the step of positioning the mobile terminal, acquiring a single photograph by means of the photographic instrument of the mobile terminal, and - determining an orientation of the photographic instrument of the mobile terminal, during the step of acquiring the photograph, by means of the orientation detection device and the controller of the mobile terminal, characterized in that the method furthermore comprises at least the following steps: - extending at least one contour of the photograph acquired, during the acquisition step, along at least one direction, by means of the controller of the mobile terminal, and - superposing data of the photograph (Pe) extended, during the extension step, with a solar path diagram, in a common reference frame (R, V), so as to determine a solar mask at the predetermined location of the photovoltaic panel. the method being carried out by means of a mobile terminal, the mobile terminal comprising at least: - a controller, - a photographic instrument, and - an orientation detection device, - a controller, - a photographic instrument, and - an orientation detection device, the method comprising at least the following steps: - positioning the mobile terminal at a predetermined location of a photovoltaic panel of an autonomous electrical energy supply device, the autonomous electrical energy supply device being configured to supply an electromechanical actuator of a motorized drive device with electrical energy, in an assembled configuration of the installation, - after the step of positioning the mobile terminal, acquiring a single photograph by means of the photographic instrument of the mobile terminal, and - determining an orientation of the photographic instrument of the mobile terminal, during the step of acquiring the photograph, by means of the orientation detection device and the controller of the mobile terminal, - positioning the mobile terminal at a predetermined location of a photovoltaic panel of an autonomous electrical energy supply device, the autonomous electrical energy supply device being configured to supply an electromechanical actuator of a motorized drive device with electrical energy, in an assembled configuration of the installation, - after the step of positioning the mobile terminal, acquiring a single photograph by means of the photographic instrument of the mobile terminal, and - determining an orientation of the photographic instrument of the mobile terminal, during the step of acquiring the photograph, by means of the orientation detection device and the controller of the mobile terminal, characterized in that the method furthermore comprises at least the following steps: - extending at least one contour of the photograph acquired, during the acquisition step, along at least one direction, by means of the controller of the mobile terminal, and - superposing data of the photograph (Pe) extended, during the extension step, with a solar path diagram, in a common reference frame (R, V), so as to determine a solar mask at the predetermined location of the photovoltaic panel. - extending at least one contour of the photograph acquired, during the acquisition step, along at least one direction, by means of the controller of the mobile terminal, and - superposing data of the photograph (Pe) extended, during the extension step, with a solar path diagram, in a common reference frame (R, V), so as to determine a solar mask at the predetermined location of the photovoltaic panel.