Hi
One other point not yet mentioned: It's not really a generator, it's a turbine driven alternator. In order to get 120VAC ( = generator juice ) you would need an inverter as well as this gizmo. An 8KW inverter is likely to weight at least as much at this gizmo.
I'm not 100% sure I would want to try to charge batteries off of whatever it puts out. Managing the voltage might get a bit "interesting". Turbines can stall out at low speed ( unless they are on the wing of a moving aircraft and the air flow keeps them spinning).
While you might want to point it this way or that for the sound directionality stuff, that might put the exhaust heat right into that pile of brush over there. Lots of things to optimize for all at one time

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Fun
Bob