During steady-state operation over the speed and torque range at different SOC levels, FEV engineers map drivetrain efficiency numbers. Drivetrain efficiency testing is carried out on a vehicle hub-dynamometer. Overall powertrain efficiency is measured between DC power into the inverter and mechanical power output at the wheel hubs. Optionally, a split into inverter, electric motor and gearbox efficiency can be checked. The feasibility of performing this analysis is highly dependent on the accessibility of installing a 3-phase current measurement between the inverter and the electric motor and must be checked on each specific vehicle.