6.6kW vs 10kW vs 13.3kW Solar System – Which Is Right for You?
Choosing the right solar system size is one of the most important decisions you’ll make as a homeowner. Go too small and you leave money on the table. Go too large and you overspend on capacity you may never fully use. At Solar National , we’ve helped thousands of Australian homeowners find the perfect fit and the three most popular sizes we install are the 6.6kW, 10kW, and 13.3kW systems. This guide breaks down exactly what each system delivers, what it costs to run, and who each one is genuinely suited for so you can make a confident, well-informed decision before buying. Understanding Solar System Output in Australia Before comparing sizes, it helps to understand how solar generation is calculated. In Australian conditions particularly across Sydney, Newcastle, Wollongong, and the Central Coast solar panels typically receive around 4 to 4.5 peak sun hours per day. Multiply that by the system size and you get a reliable daily output estimate: A 6.6kW system p...