How does the Tesla battery impact the economics of solar?

[nixfu]

Given this new innovation, does this make home solar even more affordable? 

http://rameznaam.com/2015/04/30/tesla-powerwall-battery-economics-almost-there/

It would be interesting to hear dave's take on the idea since he has so much good experience with a pretty good size solar system at home.

[jolshefsky]

Here's a pretty dense article largely about the carbon balance: http://www.lowtechmagazine.com/2015/05/sustainability-off-grid-solar-power.html

The tl;dr version is: it's good only if the panels and batteries are manufactured near where they are deployed, and that they are manufactured in a country with low-carbon energy.