We hear there are a lot of scrap panels in Australia, due to rules when rooftop solar gets changed.
Might be cheaper having those shipped to you on pallets, vs. buying new from China.
You say "energy audit" but list alternative energy system capacity.
Is there a list of appliances, wattage, hours of operation for your home, that was used to size such a system?
10kW of PV ought to make 50 kWh/day +/- much of the year. Unless heating, cooling, or lots of water pumping, I don't know where that is being used.