13kW Solar System Price, Output, and Savings in Sydney

Thanks to falling prices and generous government incentives, 10kW to 15kW solar systems are becoming increasingly popular among Australian homeowners. A premium 13kW system—featuring a high-efficiency inverter and top-tier solar panels—starts at around $15,600 fully installed. And that’s before any rebates are applied.

Under the federal Small-scale Renewable Energy Scheme (SRES), homeowners can claim a substantial rebate that significantly reduces the upfront cost, making it easier to make the switch to solar.

While cheaper systems are available, they often include lower-quality panels with reduced efficiency, shorter lifespans, and minimal support—costing you more in the long run.

At 1KOMMA5°, we prioritise quality and long-term performance. That’s why we recommend trusted, high-performance brands with excellent warranties, ensuring your system delivers maximum savings for years to come.

For large residential systems like a 13kW system, we typically use Trina’s Vertex Series panels paired with Enphase Microinverters. These brands have consistently proven their reliability and value through our many successful installations over the years.

The number of panels depends on their efficiency. High-efficiency panels allow us to use fewer panels while still achieving the desired output.

A 13kW system can use 29 high-efficiency 450W panels instead of 34 standard 390W panels. It not only saves your roof space but can also potentially improve the aesthetics of your solar installation.

For larger systems like 13kW, we highly suggest using microinverters. Microinverters make each solar panel independent, allowing for more flexible panel placement and maximising power output in all conditions.

This technology is especially useful if you want some panels facing west to capture the afternoon sun for time-of-use billing. Microinverters also bypass a potential weak link in traditional systems - the central inverter.

If the central inverter fails, your entire system goes down. With microinverters, even if one panel experiences an issue, the rest of your system continues to generate power.

Microinverters offer several advantages, especially for large systems. To learn more about the benefits of microinverters, check out our guide on 10 key benefits of microinverter systems.