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Why a 6.6 kW solar system is the sweet spot for Australian homes
Walks through the math behind why 6.6 kW dominates new residential installs, and when to size up.
Sinova Energy1 min read
The 6.6 kW sweet spot
Most Australian retailers and installers ship a default 6.6 kW system because it sits right at the intersection of inverter sizing rules and rebate caps.
Three reasons it dominates
- Pairs cleanly with a 5 kW inverter (133% oversizing allowed)
- Falls just under most state rebate caps
- Generates roughly 25-28 kWh/day on average across NSW & VIC
If you have ducted aircon, an EV in the driveway, or plan to add a battery, sizing up beats a future retrofit every time.
When you should size up
- Heavy daytime loads
- Future EV charging
- Battery planned within 5 years
Get a quote and we will model your roof.