The sharp minds as Sharp are developing a battery system designed just for home power generators. While some mentioned in this article seem to feel most will not have any interest in the batteries, I think they are underestimating how much people like the idea of living off the grid, and sustaining themselves as much as possible.

In addition (and as mentioned here previously) the power inversion process of converting solar DC power to AC for the grid absorbs about 20-25% of the power generated. By keeping the power at home, one has the option of installing DC power appliances and light fixtures (though some AC conversion would obviously still be needed periodically until the marketplace gets used to people having DC power in the home).