A 13.2kW system (sometimes configured as 13.3kW, depending on the exact panels used) is about as large as residential solar gets before you're into commercial territory. It's built for big, energy-hungry households and small businesses. Here's what to know.

What a 13.2kW System Looks Like

  • 28–30 panels using today's typical 440–475W panels, needing roughly 56–62m² of roof space, a decent-sized roof is essential
  • Commonly paired with a 10kW inverter (the panels are deliberately oversized to lift real-world generation), sometimes a larger inverter depending on design
  • Three-phase power is typically required at this size

What It Generates

Across QLD and NSW, a well-installed, unshaded 13.2kW system typically produces around 48–56kWh per day, averaged over the year. That's a large amount of energy, this size only makes sense if your usage (or your battery and EV charging) can genuinely make use of it.

Output figures are estimates based on industry-standard modelling for north-facing, unshaded roofs. Orientation, tilt, shading and weather all affect real-world results.

Who a 13.2kW System Suits

  • Large, all-electric homes, think big families with ducted air conditioning, a pool, and one or more EVs
  • Households planning a sizeable battery and wanting enough generation to fill it and cover heavy use
  • Small businesses with substantial daytime load

Three-Phase & Roof Space

Two practical requirements matter most at this size: enough unshaded roof for 28–30 panels, and three-phase power for the connection and export headroom a system this large needs. We confirm both as part of your quote, if a 13.2kW system isn't the right fit for your property, we'll tell you and design something that is.

What Affects the Price of a 13.2kW System

Every property is different, so a tailored quote is the only real guide to your price. The main factors are component quality, the size and complexity of your roof, your location, and any three-phase connection work, which we quote separately and transparently. The federal incentive (below) is applied as an upfront discount.

The Federal Incentive (STCs)

A 13.2kW system in QLD or NSW earns roughly 90 small-scale technology certificates in 2026, an incentive of about $3,200–$3,700 at recent certificate prices, applied as an upfront point-of-sale discount (already included above). The certificate count steps down each January until the scheme ends in 2030, and prices float with the market. Eligibility criteria apply; EFS Solar is not affiliated with any government body.

Payback

Most households and businesses installing a quality 13.2kW system see it pay for itself in roughly 4–7 years, depending on self-consumption, tariff, export rules and real-world output. Because a system this large only pays off if you use or store what it makes, right-sizing is everything. These are estimates only, actual results vary.

Get a Straight Answer for Your Property

Explore residential solar, commercial solar, or request a free quote, we'll confirm your roof, phase type and usage, and design a system that's genuinely worth the investment.

About the figures on this page: incentive, output and payback figures are market estimates as at July 2026, drawn from the Clean Energy Regulator's STC framework and published Australian solar output data. They are general guidance, not a quote, actual prices, incentives and results vary by home, location and market conditions.