Probably the battery's max output plus the engine's max output.
What's the point of having motors that exceed the battery's output? It's the way the hybrid system works...the engine(through a motor-generator) will produce much of the electrical power.
Why bother? The electric motors can generate substantial torque, so you can get rid of the need for multiple gear ratios to get the most out of the engine.
This is based on my understanding of this topic...someone will come along and correct me if I'm too far off base.
