The thesis focuses on the analysis and optimisation of the electrical system of a pleasure boat, to assess the possibility and feasibility of switching from an electromechanical to an electronic system, taking the automotive and home automation sectors as a reference. The work was carried out at Electrical Marine, a company that designs electrical systems for boats. The first project concerns the implementation of Schneider Electric's PowerTag, a power monitoring system for acquiring electrical parameters on AC utilities. In fact, considering that the goal of the nautical world is to move towards electric power, it is necessary to understand the effective consumption of loads in order to correctly size the capacity of lithium batteries.