As of November 2017, approximate prices for good quality solar panel systems (Tier 1 panels + quality central inverter), fully installed, are:
- 3kW : $4,000 - $6,000
- 5kW : $5,000 - $8,500
- 10kW : $12,000 - $16,000
Note that these prices also include the discount from the 'solar rebate'.
Costs can increase if you need a switchboard upgrade or other electrical work to make your home suitable for solar panels, or if the design of your home makes the install more difficult. If you decide to go with micro inverters over a central inverter, costs will also increase by approx 20-30%.
If you're quoted much less than these price ranges by a solar salesman, chances are they're cutting corners somewhere or using inferior quality products to deliver a lower overall cost. So, be wary!