Oops . My extensive research for my last post was googling solar systems . Just had another look and you're right . It's more like a 3kw system for $4,000 and that's on special.
http://www.eurosolar.com.au/specials/
So a $1.33/watt and we don't know the quality etc of course.
Still means the AGL sounds a bit expensive but I've just realized that there is no roof for them to put them on . I guess when you consider the cost of the structure just to mount the panels , that could be as much as the panels themselves .
That's making more sense . Maybe I should think first , type second !