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What Configuration- Series or Parallel

The series configuration consists of 5 main components, two electric motors, a power electronic converter, the electronic controller and the batteries. In this configuration, the combustion engine is directly connected to a generator. This generator can either charge the batteries (when the vehicle is slowing down) or provide power to the electric motor which in turn powers the wheels (via the transmission).

 While this approach is simple, it  adds to the cost of the system since it needs 2 electric motors (one generator and one motor) and the power electronic converter. Any savings due to the reduction of the engine size is erased due to the use of at least one large electric motor. Consequently, the cost of a series system remains prohibitive.

For city applications series hybrid electric systems are optimal but in the Indian context this configuration may not be economically viable.

The parallel configuration consists of only 3 components, an electric motor, the electronic controller and batteries.

In this configuration, the electric motor and the combustion engine are connected to the transmission individually. The electronic controller switches between motor and generator modes depending upon whether the vehicle is accelerating or braking. 

This configuration is the best for a mixture of highway & city driving and is economically viable for the Indian market.