Considering a similar system like that in southern Europe where installation is pretty cheap, and the prices are higher, I see A$12000 for a 10KW system of panels and a 10KW Fronius three-phase inverter.
For the record:
33 x 370W solar panels (Jinko) - 12 year warranty
Three-phase inverter (Sungrow), battery capable down the track
Installation (labour, mounting kits, wiring, etc)
Total is A$13,000 -- less the government incentives / subsidy ($36 / STC) of A$6,600 which are intercepted by the vendor in this case.
In Australia these subsidies are taking yet another hit at the end of this year, hence there's a bit of a spike in people paying for these systems, but scheduling installation in 2021.