Have a look at this great generator conversion
from Steven Harris:
http://www.youtube.com/watch?v=lrhlRIvNjTc
Running 1000 Watts of incandescent bulbs for 4.5 hours on
the gas inside the balloon.
With Butane it would run 16 hours !
Not bad !
The question still is how to cheaply generate our own gas fuel
like Terpine or H2 or simular fuels in our backyard and get it into the
balloon safely...
Regards, Stefan.