According to Solar Choice's own data, the average 10kW solar system price in Australia as of July 2025 is about $0. 91 per watt – or about $9,130 after the federal STC rebate is deducted. That's $1,800–$2,400 per year in savings. So in 5 years, that's $10K+ easily. A 10kW solar system in Australia costs $9,200 – $10,200, produces around 38–44 kWh per day, and typically suits large homes and small businesses looking to save $3,000–$3,800 per year, depending on usage and feed-in tariffs. So let's consider 3 scenarios to see how the payback works: Use all the. In this guide, we'll break down 10kW solar system prices, output, payback periods, battery options, and city-specific costs to help you decide if this system is right for your property.