> Dad in Victoria Australia just got 10.6kw fully installed and operational for $4000 AUD. ($2,700 USD)

How the heck are the panels even installed and connected for that price? That's about 25 panels, IIRC. What about the installation material and the ac/dc converter?

All covered in that price.

Government incentives. Spend tax dollars putting solar on literally every roof in the country instead of more coal or nuke plants.