[ZeroGravitas]

The net storage graph clearly shows they aren't drained empty after 3 hours. They keep their remaining charge for the more expensive morning peak rather than compete with cheap imports overnight (there's a graph showing the cost over the time range too).

[sampo]

Good point, and good financial strategy. But the morning discharge seems to be about 5%–7% of the evening discharge, so I assume the batteries near empty.

[ViewTrick1002]

It is a direct correlation with the electricity price. As the evening peak is saturated the morning peak will follow. Followed by the night.