The drivetrain and software. The inverter is what takes "electricity coming out of generator" and transforms it to high voltage DC power suitable for battery-charging and electric-motor-running.Dutch said:
Fisker said the component, which changes power from a battery to drive large electrical equipment, was available from another supplier and that the change would not risk a delay to the Karma launch in March.''
Link: http://www.reuters.com/article/idUSTRE6AF5ZA20101117?pageNumber=2
If this is true, how much of the Karma still comes from Quantum: solar roof, software?