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GM has stated that their intent is to create a global car that has full performance under all reasonable driving conditions. They have spoken about starting the genset at 30% but have shown the battery will be allowed to discharge below this point when exrra power is needed. The car must still be able to perform even when starting a long inclining drive at 30% SOC. While the full power of the traction (driving) motor may be utilized for hard accelerations. These are only short term loads that require high power but not a lot of energy. The battery can easily supply the full power needs even when at 30% SOC and a bit below that.
 

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The first answer may or may not be accurate, but neither contradicts what we are saying. The generator's power will either flow completely through the battery or the generator, motor, and battery power control module will share the same bus. I have heard the Volt described both ways by GM personnel. Perhaps Lyle could get a clarification from the GM engineering team on this. In any case, the battery is capable of supplying full power to the motor.

The second Q&A is only referring to how the intend to control the genset under "charge sustaining". Since the genset is more than large enough to power the average needs of the car, it could also charge the battery to 100% if desired. GM wants to maximize the benefit of plugging-in (since this what makes the Volt so special), so the want to keep it as close to the lower side of the discharge cycle as practically possible. The genset will be optimized to run at about 25KW. This is more than enough for normal driving conditions. This will allow the battery to cycle between something like 25-40% during charge sustaining mode and always reach an electric with the battery in this range of charge.
 
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