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A quick search gives figures of AUD 5-7K for a ~6KW system.

https://www.solarchoice.net.au/blog/6kw-solar-pv-systems-pri...

https://mcelectrical.com.au/blog/what-size-solar-system-do-i...

https://solaray.com.au/6kw-solar-power-system-price-output-s...

(The last one suggests that cheap 6KW systems are junk)

There is a lot of negotiation room with solar installs. I paid just shy of $7K AUD for a 8.2kW Fronius inverter with 9kW worth of Suntech panels. The solar credit scheme contributes quite a lot of money to the installers so subsidise the setup. I checked wholesalers and I think the materials were worth more than the $7K AUD.

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