My friend said he read someone claiming on his blog that in a series hybrid drivetrain consisting of a small engine and an alternator connected by a shaft & belt, the alternator acts as a motor at all times except the power stroke ? I wanted to know if anyone has experimented with this and observed any such phenomena. The point was raised after our drivetrain was found to be quite inefficient and wasting energy. We run a small 35cc engine to run an alternator (which is basically a modified dc brushless hub motor) that charges the supercapacitor and (reportedly) runs the motors in the wheels too. We see a lot of energy is going into waste and one of the points listed above might be the reason. Comments please !