This project is part of the project “GenPowerBox”; this is a project of the company Mastervolt, realized by Whisper Power. The objective of this project is to develop a compact and noiseless energy management system for use on board of yachts. The “GenPowerBox” system is composed of a battery and a generator set; consisting of a diesel engine and a Permanent Magnet Synchronous Generator (PMSG). This MSc project is focused on the Permanent Magnet generator. The generator is integrated in the flywheel of the diesel engine. The main objective of this project is to determinate the most suitable generator for the application on yachts. Another goal is to validate the models of different generators designs. These models represent the induced voltage, different losses and the efficiency of the generator. This is done by performing several tests on different prototypes of both 3kW and 9kW generators. The measurements results are then compared with the simulated results. The distinctions between the designs consist of: - The type of the permanent magnets (ferrite or NdFeB), - The combination of number of poles and slots (2/3 or 8/9), and - The type of the slots (Open or semi-closed slots).