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Model based development is an approach pursued to obtain an advanced insight into powertrain & vehicle development. This approach enables the ability to trace errors early on, thereby reducing the dependence on field testing and saving cost & time involved in the development process. The purpose of this study is to develop a system level battery electric vehicle model using GT-Suite as modeling platform, for Light Heavy Duty applications. The outcome of this study is electric range estimation, performance analysis, component sizing and optimization for inverter-motor and battery components. The model has been developed using a map-based approach. Hence, the simulation time is faster than real-time, requires less input data and can be used for preliminary range & performance estimation. The model fidelity has been validated against performance, acceleration, deceleration and coast-down data obtained from field testing.