As an observation, I visited Australia in 2014 and in Brisbane another friend, a recent immigrant from Kenya, had installed the full house system. His panels sat on his roof, as in fully covered the house!
He sells back power to the grid as his solar system produces more than he can consume. It was a 4 bedroom house, single storey with 4 family members: 2 adults and 2 kids. Both adults work, so minimal consumption during the day.
Imagine getting a credit note every month from the power company!
Business opportunities are like buses,there's always another one coming