Costs & savings

How much does a 10 kW solar system cost in Australia?

About $9,000 to $12,500 fully installed in 2026, rebate already deducted, with owner-reported prices averaging close to $10,000. That buys 21 to 26 panels producing around 40 kilowatt-hours a day — enough for a large household, a battery and an electric car. The catch is your grid connection: on single-phase supply you may not be allowed to export all of it.

By Kieron Taylor, Founder, Solar Select · Updated · 6 min read

The 30-second take

  • $9,000 to $12,500 installed for a 10 kW system in 2026 (Solar Calculator). SolarQuotes’ 853 owner-reported 10 kW prices averaged about $10,000, with a real range of $7,000 to $20,000.
  • 21–26 panels on an 8 kW or 10 kW inverter, roughly 45–50 square metres of roof.
  • About 40 kWh a day averaged across the year — Solar Calculator’s city figures run from 36 kWh in Melbourne to 44 in Perth.
  • STC rebate worth roughly $2,500–$2,700 in most metro postcodes in 2026, already in the quoted price.
  • On single-phase supply most networks cap exports at 5 kW; 10 kW makes most sense with three-phase, a battery, an EV or a large daytime load.

The 2026 price

A 10 kW system costs about $9,000 to $12,500 fully installed in 2026 according to Solar Calculator. SolarQuotes, which collects prices from owners, reports an average close to $10,000 across 853 installations, which lines up with the roughly $1,000-per-kilowatt rule that governs Australian solar pricing.

The number that matters more than the average is the range. Those same 853 owners paid anywhere from $7,000 to $20,000 for a nominal 10 kW, and SolarQuotes names the installer you choose as the biggest single factor behind the spread. All of these prices are after the federal rebate.

“Nearly three times between the cheapest and dearest 10 kW system, for the same nominal size. The panel brand explains a fraction of that; the installer explains most of it.”

What 10 kW actually is

Twenty-one to twenty-six panels, depending on wattage, on an inverter rated at 8 kW or 10 kW. Where 6.6 kW fits the standard 5 kW single-phase inverter limit, 10 kW does not, and that is the first question to settle before pricing it.

On three-phase supply a 10 kW inverter is routine and export is rarely restricted. On single-phase, most networks — Ausgrid, Endeavour, Energex, SA Power Networks and the Victorian distributors among them — cap exports at 5 kW. You can still install 10 kW of panels, but the inverter will be export-limited, and everything above 5 kW that the house is not using at that moment is curtailed rather than sold. For a home that self-consumes heavily, with a battery or an EV charging at midday, that limit barely bites. For a home that exports most of its output, it wastes a third of the system.

What it produces and who it suits

A 10 kW system makes around 40 kWh a day averaged across the year, from about 36 in Melbourne to 44 in Perth. Solar Calculator’s Brisbane example puts annual savings at roughly $2,170. That is well above the whole consumption of the regulators’ benchmark household, which is the point: 10 kW is a system for homes that use a lot of electricity or plan to.

  • A battery in the next few years. 10 kW gives you the headroom to charge 10–13 kWh of storage during the day and still cover the house.
  • An electric car. A typical commuter needs 6–10 kWh a day; charging it from the roof at midday is the cheapest fuel there is.
  • Ducted air conditioning, a pool, a heat pump or an all-electric home. These add daytime load a 6.6 kW system cannot cover in summer.
  • Three-phase supply. If you already have it, 10 kW is the natural size.

Without at least one of those, a 10 kW system on a single-phase home usually exports its surplus at a few cents a kilowatt-hour and the extra $3,000 to $4,000 over a 6.6 kW system takes a long time to earn back.

The rebate, by zone

A 10 kW system in a zone 3 postcode — Sydney, Melbourne, Brisbane, Adelaide, Perth — earns about 69 small-scale technology certificates in 2026 (10 kW × the 1.382 zone rating × the 5-year deeming period). At $36 to $39 a certificate that is roughly $2,500 to $2,700, already deducted from the quoted price. Zone 1 postcodes in the north earn about 81 certificates; Hobart in zone 4 about 59.

The deeming period drops to four years on 1 January 2027, which cuts the rebate by a fifth. A system installed in December 2026 is worth several hundred dollars more in certificates than the same system installed in January.

Comparing 10 kW quotes

Two quotes are only comparable when four things match: the same panel wattage and count, the same inverter size and phase, the same rebate treatment, and the same list of exclusions. Ask each installer explicitly whether the quote includes the network application for the larger inverter, any switchboard upgrade, and export limiting if you are single-phase.

If you are not sure 10 kW is right, price the 6.6 kW system from the same installers on the same day; the gap between the two quotes tells you what the extra capacity is really costing.

Get matched with 2-3 vetted solar installers — typically 2+ years in business, with a track record of decent reviews — ask all of them whether the rebate is already in the price, and let them compete on the comparison rather than on the discount.

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Sources

Every quantitative claim on this page traces to one of the sources below — government, manufacturer, or independent AU industry reference. Last verified 2026-09-18.

We use AI to help research and draft. Claims are traced to the sources below and dated. Where we haven’t got a source, we say so on the page — treat that as a starting point and do your own research.

General information only. It doesn’t take your circumstances into account and isn’t legal, financial, insurance or electrical advice. Rebates, tariffs, network rules and product terms change — confirm anything you plan to rely on with your installer, insurer, retailer or distributor, and see our terms.

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