Broad estimates:
$4,000 - 5,000 for solar (3-4kW)
$7,000 - 10,000 for battery storage (subject to rebates)
$3,000 for air-sourced heat pump (hot water)
$3,000 insulation, air-sealing
$2,500 split-cycle air-conditioning
Around: $20,000 - 23,000 per dwelling