Here in the US, fat is *too* renewable. I don't think there will be a way to use it all up, and even if that happened, it would only be a good thing. (The models would hope that doesn't happen, since that would cause being skinny to lose status.)
The inverter is too small (500W design rating) to completely supply every load in the average house. It does, however, offset the loads, which is the whole point. It is essentially using the grid as a battery with "unlimited" capacity and lifetime. The DC/DC converter can also be used by itself to power electronics independent of the grid, although the maximum load would be limited to about 35W or it goes unstable. It's also possible to use the alternator to charge a 12V battery, although MPPT would not be available and the efficiency would not be optimum.
I have a BMI of 27.5, which is really high for an Asian. I don't know any Asian who is fatter than me. In contrast, my best friend Tiffany Yep is very skinny by US standards but just about average by Asian standards: http://oi39.tinypic.com/s5xws5.jpg
Tiffany is not, however, the skinniest person I know - my friend Yiwei Cheng is even skinnier. (Sorry, I don't have a picture.)
It's funny (but sad) that despite stronger and stronger negative bias from the models, obesity in the US is in runaway. It somewhat resembles secondary breakdown in a bipolar transistor...