A carbon neutral big island?

[JWFITZ]

8 panels would be a maximum of 800 watts, if they were big ones, and half that figure is more realistic. The inverter reflects that. So, we're looking at a .5 kw array that will make a super optimistic amount of 5 kwh of electricity a day. That will cost you 5 x .45c= two dollars and fifty cents a day. Assuming it's never rained or been cloudy in the last eight years you've got yourself 912 dollars of grid power a year, for a cost of nearly 3000 bucks a year. That's better than the 2 dollars a kw I offered up off the cuff, but dang expensive electricity at 1.50 a kw at the absolute minimum. The real figure I expect is about double that.