13 kW Solar Systems: Prices And Information
Last Updated: 8th May 2026
If you’re considering a 13 kW solar system, you probably have a large electricity bill, plenty of roof space, or you’re planning ahead for big electric loads such as an EV, pool pump, ducted air conditioning, or a home battery.
A 13 kW solar system is a big residential system, but it’s not as unusual as it once was. As solar prices have fallen and panels have become more powerful, many Australian homes are now going well beyond the old 6.6 kW standard, especially where the roof and local network rules allow it.
But don’t assume bigger is always better. A 13 kW system makes the most sense if you can use a decent chunk of the solar electricity during the day, store it in a battery, or get enough value from exporting the surplus.
How Much Does a 13 kW Solar System Cost?
Expect to pay about $10,000 – $18,000 out-of-pocket for a good-quality 13 kW solar system, professionally installed by a reputable installer. The final price will depend on your roof, switchboard, inverter choice, panel brand, and whether the installation needs extra work such as tilt frames, multiple roof faces, or a more complex cable run.
The graph below shows what 1049 Australians have reported paying for their 13 kW system in the last two years.
At the cheaper end, you should still expect decent components and a competent installation. At the higher end, you’re likely looking at better panels, a better inverter, a more carefully designed system, and an installer who isn’t trying to smash it out as quickly as possible.
How Many Solar Panels Will You Need for 13 kW?
To make up a 13 kW solar system, you need around 30 solar panels, assuming you use 440W modules. That will give you 13.2 kW of solar panel capacity.
Each panel will be about 1.8 m x 1.1 m, so you’ll need around 60 square metres of suitable roof space. In the real world, you may need more usable roof area than that because of gutters, hips, valleys, vents, chimneys, skylights, roof edges, and shading.
Also, don’t assume all 30 panels need to face the same way. A good installer can often split a 13 kW system across multiple roof faces, such as north, east and west, to spread generation across more of the day. That can be especially useful if you’re trying to run appliances, charge an EV, or feed a battery during daylight hours.
How Much Electricity Will a 13 kW Solar System Generate?
A 13 kW solar system will generate approximately 52 kWh per day on average, or around 19,000 kWh per year. Actual generation will depend on your location, roof direction, roof angle, shading, inverter setup, panel quality and the time of year.
To put that in perspective, 52 kWh per day is enough electricity to cover the daytime needs of a large home, run energy-hungry appliances, and still export plenty of surplus on sunny days if you don’t have enough daytime consumption.
It could help power:
Approx 2-3 ducted air conditioning systems on a hot or cold day.
OR
A pool pump, hot water heat pump, household appliances and some EV charging.
OR
A large home with a battery, where the solar charges the battery during the day and the battery covers evening usage.
But remember: generating 52 kWh per day does not automatically mean you use 52 kWh per day. If your home is empty during daylight hours and you don’t have a battery, much of that solar electricity may be exported to the grid.
How Much Will a 13 kW Solar System Save on Electricity Bills?
The amount you’ll save with a 13 kW system depends heavily on two things:
- How much solar electricity you use in your home instead of exporting.
- How much your electricity retailer pays you for exported solar electricity.
Self-consumption is the big one. Most people pay much more to buy electricity from the grid than they get paid for exporting solar electricity.
You can calculate the savings a 13 kW system brings you with our solar calculator.
How Long Before a 13 kW Solar System Pays for Itself?
Payback will depend on your system price, feed-in tariff, grid electricity tariff, location and how much of the solar electricity you use yourself.
As a rough guide, if you pay a reasonable price for a good-quality 13 kW system and self-consume a decent amount of the solar electricity, a payback period of around 4-6 years is achievable. If most of the electricity is exported for a low feed-in tariff, payback will be much slower.
A 13 kW system can work very well if you have big daytime loads, a battery, an EV, or you’re deliberately shifting electricity use into the solar window. But if you’re barely home during the day and don’t plan to add a battery or EV, a smaller system may give a better return.
To get a better idea of simple payback for a 13 kW solar system in your circumstances, try our solar calculator.
Is a 13 kW Solar System Worth It?
A 13 kW solar system can be a great choice if:
- You have high daytime electricity use.
- You have or plan to buy an electric car.
- You have a pool pump, ducted air conditioning, electric hot water or other large loads.
- You want to charge a home battery from solar.
- You have enough suitable roof space.
- Your local network will allow the system size or export arrangement.
But if your electricity usage is modest, your roof is heavily shaded, or your network export limits are tight, then 13 kW may be overkill.
The best approach is to get quotes from installers who will look at your actual electricity usage, roof layout and local network rules before recommending a system size.
If you want pricing on a 13 kW solar system from local specialists I trust, you can get 3 quotes here.