6.6kW Solar System Guide: Output, Panels & Pricing
The 6.6kW system is Australia’s most popular residential size. Here’s what it generates, how many panels you need, and what it costs.
In Australia, 6.6kW of panels paired with a 5kW inverter is the default home system. The 1.66:1 panel-to-inverter ratio captures more production in the shoulder hours while keeping inverter cost down.
Typical output
In most Australian capitals a 6.6kW system generates roughly 24–30 kWh per day, or around 8,800–11,000 kWh per year. Exact output depends on orientation, tilt, shading and local sun hours.
Panels needed for a 6.6kW array
| Panel wattage | Number of panels | Approx roof area |
|---|---|---|
| 330W | 20 panels | ~40 m² |
| 370W | 18 panels | ~36 m² |
| 440W | 15 panels | ~30 m² |
What it typically costs
Installed prices in Australia commonly range from roughly A$6,000 to A$10,000 depending on panel/inverter brand and install quality. Plan for a premium tier (premium panels + string or hybrid inverter) to sit at the top of that range.