Tesla Motors Club

My daughter just got the power wall installed and running last week. Below she sent me this photo, and asked what is happening. She thought the solar panels would always feed the house first, and then draw from the batteries to make up the difference. But it is sending all the solar power to the grid, and running the home off the batteries. Why does it do this? It is 4:40 in the afternoon, and overcast due to the fires in SoCal.