Australia has become a global leader in solar energy adoption, with more homeowners opting for solar power each year. Among the various system sizes available, the 6.6kW solar system is one of the most popular. It strikes the right balance between cost, efficiency, and energy production, making it a Contact online >>
Australia has become a global leader in solar energy adoption, with more homeowners opting for solar power each year. Among the various system sizes available, the 6.6kW solar system is one of the most popular. It strikes the right balance between cost, efficiency, and energy production, making it an excellent choice for many Australian households. In this guide, we’ll explore everything you need to know about 6.6kW solar systems, including their cost, financial benefits, and environmental impact.
A 6.6kW solar system typically includes 20 to 24 solar panels, depending on their wattage. Each panel usually ranges between 275W and 370W. The system might have 20x330W panels, or 24x275W panels – in either case, it’s a 6600W (6.6kW) system and that’s the number that really matters.
This system size is ideal for medium to large households, generating enough energy to meet daily electricity needs. On average, a 6.6kW system produces between 24 to 27 kWh of electricity per day. However, actual output can vary based on factors like panel efficiency, location, and weather conditions.
Most 6.6kW solar systems in Australia come with a high-quality inverter. The inverter converts the direct current (DC) produced by the solar panels into alternating current (AC) used by household appliances. Many Australian homeowners choose a 6.6kW system because it maximises the benefits offered by government incentives under the Small-scale Renewable Energy Scheme (SRES).
A 6.6kW solar power system will require about 32-35 square metres of suitable rooftop space, based on each panel measuring approximately 1.8 metres by 1.1 metres.
The cost of a 6.6kW solar system in Australia can vary depending on several factors, including the quality of the solar panels, the brand of the inverter, and the complexity of the installation. On average, you can expect to pay between $5,000 and $9,000 for a fully installed system. While the initial cost might seem high, the long-term savings on electricity bills make it a worthwhile investment.
Many homeowners find that the system pays for itself within three to five years. Additionally, several financing options are available to help spread the cost over time, making it more affordable. Green loans, payment plans, and other financial incentives make solar power more accessible to Australian households. Furthermore, solar power can increase your property’s value, offering even more financial benefits in the long run.
The ideal battery size for a 6.6kW solar system in Australia varies based on your energy usage. For low to medium users, a battery with a capacity of 10 to 13.5 kWh typically provides enough storage for excess solar energy. This allows you to maximise self-consumption and minimise dependence on the grid.
Investing in a 6.6kW solar system can significantly reduce your electricity bills. Depending on your household’s energy consumption and the efficiency of your system, you could save up to $1,500 per year. Over the lifespan of the system, these savings can amount to tens of thousands of dollars.
In addition to reducing energy costs, a 6.6kW solar system can generate income through feed-in tariffs (FiTs). Many Australian states and territories offer FiTs that pay homeowners for the excess energy their solar systems produce and send back to the grid. This feature helps you recoup your initial investment faster and provides a steady income stream over time.
Switching to solar power is not only financially beneficial but also environmentally responsible. A 6.6kW solar system reduces your reliance on fossil fuels, which are a major source of greenhouse gas emissions. On average, a 6.6kW system can offset around 6 to 7 tons of carbon dioxide per year. This reduction is equivalent to planting approximately 100 trees annually.
Solar energy also reduces the strain on Australia’s national power grid, especially during peak usage times. By generating your own electricity, you contribute to a more sustainable and resilient energy system. Moreover, as more Australians adopt solar power, the country moves closer to its renewable energy targets, helping to combat climate change.
The 6.6kW solar system offers a great solution for Australian homeowners looking to reduce their energy costs, increase their property’s value, and make a positive environmental impact. With its balance of affordability, efficiency, and sustainability, this system is an excellent choice for medium to large households. As solar technology continues to advance and government incentives remain strong, now is an ideal time to invest in a 6.6kW solar system. Make the switch today and enjoy the financial and environmental benefits for years to come.
If there''s a ''standard'' solar system that is commonly sold in Australia, it''s a 6.6kW size, or commonly referred to in the industry as ''a 6.6''. There''s a couple of reasons why the 6.6kW solar system has become so ubiquitous with solar system sizing in Australia.
Firstly, a 6.6kW solar system is usually paired with a 5kW solar inverter. In most areas of Australia this is usually to the maximum solar inverter size allowed on a single phase installation without export limiting. Export limiting is where the DNSP (or distributor, ie. the company that owns/operates the poles and wires) limits how much you can feed back to the grid at any one time.
Secondly, a 6.6kW system used to be a great option for most single phase homes (ie. most residential properties) when it came to drastically slashing their energy bills. I say used to be because in 2024 feed-in tariffs are lower than they''ve been historically, and we''re also using more electricity than ever before - especially as many households transition away from gas. So whilst a 6.6kW system might still be appropriate, it''s far from a ''one size fits all'' solution - more on this later.
Somewhat confusingly, the number quoted when it comes to solar system size is the total PV (solar panels) connected to the inverter.
Thankfully, it''s a simple thing to calculate - simply multiply the number of panels by their rated power.
For example, if you were using
The formula - if you''re a math nerd - is simply [Panel power (kW) each] x [Number of panels].
You might be wondering how 15x 410 or 420 watt panels can be referred to as a 6.6kW system when they''re close to (but not exactly) 6.6kW total PV generation.
Most of the time solar inverters are not rated to have more than 1.33 times the inverter output connected, and consequently the federal government will not allow any more than 1.33 times the inverter output for the purposes of claiming STC incentives.
If the inverter''s rated output is 5kW this means that the maximum amount of PV that can be connected (and therefore STCs claimed) is 6.65kW.
Going back to the 420W panel example used above to illustrate, if we connected 16x panels for a total of 6.72kW it would a) exceed the inverter manufacturer''s specifications for the amount of solar connected and b) prevent us from claiming STCs.
Some people obsess over getting a panel size that allows you to get to 6.6kW or 6.65kW. We''d suggest that this is a bit of an overreach. Choosing a quality brand of panel and inverter is far more important than getting to exactly those numbers.
The short answer is it depends.
If your roof space is adequate, energy bills are within a certain range, and solar self-consumption potential is high enough, we can (and do) recommend 6.6kW solar systems to certain clients.
However, if your bills are over (or under) a certain threshold, you''re limited in roof space, or you consume the vast majority of your energy at night time, a 6.6kW solar system may not be the right thing for you.
A 6.5 or 6.6kW solar system is the perfect way to produce your own almost endless supply of power using renewable energy from the sun. A 6.5 kW or 6.6 kW solar system can produce enough electricity to reduce your power bill to zero.
Solar power allows you to control how much power you use and when you use it. You no longer need to worry about the rising cost of power when you''ve got lots of visitors who need lengthy hot showers.
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