Actually, that power curve shown above IS motor output power (labeled mechanical power, not electrical power). The battery output is what is on the instrument cluster, which I've never seen higher than 120 kW but regularly above 105 kW. I posted a link in another thread with lots more information from an SAE presentation that GM participated in.emotodude wrote:EV power is almost always claimed as "BATTERY POWER". That is the power the battery is delivering. You will lose at least 10% of that in even the most efficient vehicles before it comes out at the contact patch of the tire. The spark motor is probably in the low 90% efficiency range, the controller is probably mid 90%, you probably lost a couple percent in hi-power interconnects (even in the battery itself), and another 5% in mechanical drive-train losses. I would be shocked (pun intended ) if the Spark EV was getting over 85% Total System Efficiency.
Zero Motorcycles, for whom I used to run R&D, have a very clean drive-train, single stage belt direct from motor to wheel and approach 90% total system efficiency.
This presentation shows that the traction system (motor, inverter, drive unit) are 93% efficient at best, and at maximum power obviously less. Giving credit where it's due, GM has made this system incredibly efficient, which is a large part of why the Spark EV has the best MPGe of any vehicle ever classified by the EPA!
PS. I'm a big fan of many parts of the Zero bikes (ditto for Brammo). I don't dare test ride one for fear of coming home with it until after I sell my current bike.