This project, conducted as part of a master's degree thesis, focuses on the electrification of off-road vehicles, particularly those utilized in agricultural settings, including excavators, tractors, and loaders. The study specifically examines the conversion of a mini excavator that currently operates on an internal combustion engine (ICE) to an electric-powered system. This thesis explores the process of electrifying the ICE-operated excavator by selecting appropriate electric components, modelling the electric circuit, determining the sizing of the system based on its intended application, and conducting efficiency mapping of the electric system. In this transformation, the traditional internal combustion engine is replaced with an electric motor, battery, and inverter.