The paper discusses a low fidelity mathematical simulation model using a backward facing modelling approach to vehicle simulation for calculation of energy requirements and flow through a simplified Series-HEV. Mathematical modelling techniques for HEV’s are well established method for purposes such as vehicle system simulations, developing control strategies, energy usage and range estimation with high detail and high degree of accuracy, and have been discussed extensively in literature. The paper discusses a low fidelity mathematical model of a Series-HEV which can be used to introduce undergraduate engineering students to concepts of HEVs. The model will be used as a case study to introduce and inspire students into using mathematical modelling of systems for their engineering coursework. Simplicity in development of model, modularity for further development and a sequential calculation approach which can yield results at each step for explaining key concepts of HEV is preferred at a sacrifice of the level of detail and accuracy of result. The paper concludes with discussion on further development possibility by students using the model as a platform.