Not sure which solar system size is right for your home and budget? Solar system prices by size in Australia vary widely, from around $2,500 for a compact 3kW setup to over $18,000 for a large 15kW system. In 2026, with electricity bills rising and federal rebates still in play, choosing the right system size is one of the best financial decisions you can make. This guide breaks down every key system size – so you can compare costs, outputs, and savings in one place.
Why solar system size matters
Bigger is not always better. The right solar system size depends on how much electricity your household uses, when you use it, and whether you plan to add solar battery storage, a pool, or an electric vehicle (EV).
Powering up your EV with solar
If you’re thinking of buying an EV, adding an EV charger to your solar system is a smart way to “fuel” your car with clean, renewable energy.
A system that is too small will leave you buying expensive grid power. One that is too large may produce more than you can use, especially if your feed-in tariff is low.
Before comparing prices, it helps to know your average daily electricity use in kilowatt-hours (kWh). Check your electricity bill – most Australians use between 15 and 40 kWh per day.
How solar rebates affect the price you pay
All prices in this guide are after the federal Small-scale Technology Certificate (STC) rebate under the Small-scale Renewable Energy Scheme (SRES). This rebate reduces the upfront cost of your system and is applied automatically by your installer.
The STC rebate amount depends on your location (solar zone), system size, and the number of years remaining in the scheme. The scheme reduces each year, so buying sooner means a larger discount.
3kW and 4kW solar systems – Prices and who they suit
3kW solar system
Price range: $2,500 – $4,000 (after rebate) | Daily output: ~10–13 kWh
A 3kW system is the smallest practical option for most Australian homes. It suits small households with low electricity use – typically one or two people who are out during the day.
These systems use around 8–10 panels and fit well on smaller roofs. They work best when most usage happens during daylight hours.
Best suited for:
- Small apartments or townhouses
- Retirees or single occupants
- Low-consumption households under 15 kWh/day
- Homes with limited roof space
4kW solar system
Price range: $3,200 – $5,000 (after rebate) | Daily output: ~14–17 kWh
A 4kW solar system is a step up for small to medium-sized households. It is a popular choice for couples or small families who work from home part of the week and want meaningful bill reductions.
At roughly 10–12 panels, this system fits on most standard roofs and offers a good balance between cost and output.
7kW and 8kW solar systems – Prices and who they suit
7kW solar system
Price range: $5,500 – $8,000 (after rebate) | Daily output: ~25–30 kWh
The 7kW solar system hits the sweet spot for average Australian families. It covers typical household loads, including air conditioning, washing machines, and dishwashers, with energy to spare on sunny days.
It is increasingly popular because it can comfortably handle daytime energy needs for a four-person household and provides enough surplus to earn decent feed-in tariff credits.
Best suited for:
- Average 3–4 bedroom homes
- Families with daily usage of 25–35 kWh
- Homes running ducted air conditioning
- Households planning to add a battery later
Use Energy Matters’ easy-to-use solar power and battery storage calculator to determine the size of your solar system with storage! Our solar calculator will generate performance information and potential savings.
We can send this information to 3 of our pre-vetted, trusted local installers in your area to receive obligation-free solar quotes and take the first step toward true energy independence!
8kW solar system
8kW solar system price: $6,000 – $9,000 (after rebate) | Daily output: ~30–38 kWh
An 8kW solar system is the right move for larger families or homes with pool pumps, multiple AC units, or an EV charger. It produces around 30–38 kWh per day in most Australian locations.
Compared with a 6.6kW system, an 8kW system costs only marginally more but generates significantly more power – especially in states like Queensland and Western Australia where sunlight hours are highest.
The payback period for a quality 8kW system is typically 3–5 years, making it one of the strongest investments available in the residential solar market.
13kW solar system – Including 13.2kW and 13.3kW variants
The 13kW solar system – and its closely related variants, the 13.2kW and 13.3kW systems – are among the most-searched system sizes in Australia right now. Here’s why.
These systems effectively combine two 6.6kW systems on a single inverter or split them across two inverters. They suit homes with very high energy demands, EV charging, large families, or those aiming for near energy independence.
13kW solar system price range: $9,000 – $16,000 (after rebate) | Daily output: ~50–60 kWh
13.2kW solar system price: $9,500 – $16,500 (after rebate)
13.3kW solar system: similar pricing band to 13.2kW, depending on panel configuration
Best suited for:
- Homes using 40+ kWh per day
- EV owners wanting to charge primarily on solar
- Households planning battery storage
- Home offices or small home-based businesses
- Maximising the return from feed-in tariffs
15kW solar system – For high-demand homes
15kW solar system price range: $11,000 – $18,000 (after rebate) | Daily output: ~60–70 kWh
A 15kW system is suited to large homes, those with multiple EVs, serious home battery setups, or small home-based businesses. At this scale, you are effectively reaching the upper limit of most residential network connection allowances.
In many states, you will need network approval before connecting a 15kW system to the grid. Your installer should handle this, but it is worth confirming up front, as approval can add a few weeks to the process.
Solar system prices by size: Quick comparison table
The table below shows estimated installed costs, typical daily output, and expected annual bill savings across the most common system sizes in Australia in 2026.
| System Size | Best For | Avg Daily Output | Price Range (After Rebate) | Est. Annual Savings |
| 3kW | Small households, apartments, low usage | 10–13 kWh | $2,500 – $4,000 | $600 – $900 |
| 4kW | Small–medium homes, 1–2 people | 14–17 kWh | $3,200 – $5,000 | $800 – $1,200 |
| 7kW | Average family home, moderate usage | 25–30 kWh | $5,500 – $8,000 | $1,400 – $2,000 |
| 8kW | Larger homes, pools, EVs | 30–38 kWh | $6,000 – $9,000 | $1,600 – $2,400 |
| 13kW / 13.2kW / 13.3kW | High-usage homes, EV charging | 50–60 kWh | $9,000 – $16,000 | $2,500 – $4,000 |
| 15kW | Large homes, home businesses, max savings | 60–70 kWh | $11,000 – $18,000 | $3,000 – $5,000 |
Note: Prices are national averages after the STC rebate and include GST and installation. Actual costs vary by state, roof type, panel brand, and installer. Always request multiple quotes.
What affects solar system prices in Australia?
Two quotes for the same system size can vary by thousands of dollars. The main reasons include:
- Roof complexity: Tile roofs, multi-storey homes, steep pitches, or complex layouts add $500–$2,000 to installation costs.
- Location: Solar Zone 1 (QLD, WA, NT) receives more STCs, lowering net cost. Zone 4 (southern VIC, TAS) receives fewer.
- Installer reputation: Always use a SAA-accredited installer. Cheap installers often cut corners on equipment and workmanship.
- Panel brand and quality: Budget Tier 1 panels from Jinko or Trina cost less than premium.
- Inverter type: String inverters are the cheapest. Microinverters and hybrid (battery-ready) inverters cost more, but offer added performance and future flexibility.
Check our page for our recommended solar products.
Ready to find out which system size is right for you? Get a free, no-obligation solar quote from Energy Matters today and compare offers from pre-vetted installers in your area.
Typical payback periods by system size
Solar system payback periods in Australia have improved significantly in the last few years. Rising electricity prices, lower system costs, and improved panel efficiency have all helped.
Below are general payback period estimates for each system size, based on average Australian electricity prices of around 38–39 cents per kWh in 2026:
- 3kW: 4–6 years
- 4kW: 4–6 years
- 7kW: 3–5 years
- 8kW: 3–5 years
- 13kW / 13.2kW / 13.3kW: 4–6 years (faster with high self-consumption)
- 15kW: 4–7 years
Payback is faster when you use more solar power during the day (self-consumption) and slower when you export most of it. Adding a battery can shorten payback if you have high evening energy use.
How to choose the right solar system size
Follow these steps to narrow down the best system size for your home:
- Check your electricity bill: find your average daily usage in kWh.
- Estimate how much of that usage occurs during daylight hours.
- Consider future changes: are you planning to get an EV, add a pool, or work from home more?
- Think about battery storage: a larger solar system makes battery storage more effective.
- Get at least three quotes; prices can vary by thousands for the same-sized system.
Start saving on energy bills today with Energy Matters
Whether you’re looking at a 3kW system for a small home or a 15kW system for maximum savings, the right solar investment can cut your electricity bills dramatically for 25+ years. Prices have never been more competitive, and government rebates are still reducing upfront costs.
Energy Matters can connect you with trusted, Solar Accreditation Australia (SAA)-accredited installers across Australia. Compare solar quotes through Energy Matters to make sure you’re paying a fair price.
Get your free solar quote from Energy Matters today. Our team compares offers from Australia’s best installers – so you get the right system at the right price.
Visit Energy Matters to get started: www.energymatters.com.au.
Sources and References:
- Clean Energy Council – Approved Products and Installers
- Clean Energy Regulator – Small-scale Renewable Energy Scheme
- Solar Panel Cost Guide – SolarCalculator.com.au
