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by prawn 424 days ago
10kW in South Australia would cost about US$4,990, installed.

https://www.solarchoice.net.au/solar-panels/solar-power-syst...

When we had ours installed on a previous house, the roof installation itself was very fast - couple of hours maybe.

Beyond this, state and council/county authorities often have rebates/incentives to encourage take-up of panels and/or battery systems. Our council (county equivalent, I guess) has had group-buy initiatives, as one example, and a virtual power plant scheme.