EDIT: After a quick shower, I wanted to come back to expound on this a bit.

I've also wanted to lead a bit more of an independent life on a sailboat, traveling within my home. As an engineer at heart, I've always thought about how to best manage energy to have the top quality of life on a boat with minimal sacrifice. Solar is almost always the way to go, as the sun is usually shining where ever you're at (some folks do go with a wind turbine, but they're unreliable at sailboat scales).

Tesla's PowerWall product enables this. No longer do I have to consider running a generator full time, or having a dangerous amount of lead acid batteries onboard to store enough power to meet my first world standard of living. The more energy I can safely store, the longer I can be aware from a port, not run a generator, or in short, spend money. The less money I spend, the less I have to work a job I don't enjoy or want to (disclaimer: I love technology, I'll always work in it, I just want to be able to always be picky about the jobs I take)

Dense, cheap energy storage enables everyone to better manage their energy use, and energy is what (mostly) drives the world now. Thanks Tesla!