One of the most common solar systems in Australia, 6.6kW solar systems deliver a strong combination of size and affordability. One of the smaller systems available, a 6.6kW solar system is still a great choice for many residential and commercial applications. MLEC Solar designs, supplies and installs 6.6kW solar systems in Perth and Adelaide. Get in touch to book your free site consultation today!
4.9 stars based on 1000+ reviews from Google
A 6.6kW system usually consists of 14 – 17 solar panels, depending on the power output of the individual panels. This is because the higher the output of the solar panels, the fewer panels are needed to make up a 6.6kW solar system. That means you'll need 14 x 475W panels or 17 x 390W panels for a 6.6kW solar system in Perth or Adelaide.
With a 6.6kW solar system, you'll likely only need a 5kW solar inverter, but you can still receive the rebate on the additional 1.6kW of panels, and there's just a small increase in labour to install the larger system. Opting for a 5kW solar inverter also maximises energy output and minimises the efficiency losses that are associated with rooftop solar panels.
Mounting racks are optimally positioned to capture maximum UV exposure, hold the solar panels in place on your roof or on the ground, and are designed to withstand harsh weather conditions, including storms, high winds and extreme UV exposure. At MLEC Solar, we use high-quality mounting racks and components for long-term performance.
Monitoring systems track your system's energy generation, consumption, and grid exports in real time. This data enables you to optimise your energy usage, maximise your financial returns, and identify faults when needed. By taking the guesswork out of managing your solar energy, monitoring systems increase the savings that solar delivers.
Depending on the location, season and site condition, on average, a 6.6kW solar system produces around 24 to 28kWh per day in Australia, with sunny locations like Perth and Adelaide delivering higher averages than the national norm. That adds up to around 9,000 to 10,500kWh of electricity annually and lowers the payback period while increasing the potential for lifetime savings. That’s a great reason to start your solar journey today.
Depending on the size of the individual solar panels, you’ll need around 22 – 30m² of usable roof space to install a 6.6kW solar system on your roof. Obstructions, such as chimneys, plumbing vents or fragmented sections of roof facing different directions, involve more complex designs and require more roof space, and involve higher labour costs to install.
6.6kW solar systems have traditionally been a popular choice across Australia, including Perth and Adelaide. However, in 2026, things have changed a bit, and we’re seeing more households and businesses shifting towards larger solar systems. There are three primary reasons for this:
However, for many small households and businesses, a 6.6kW system can still be a great choice. If you use less than 25kWh per day, you’re not planning to add a solar battery or an electric vehicle, you use gas, you have limited usable roof space, and your quarterly electricity bills are still under $500, then a quality 6.6kW solar system could be a great choice for you.
Book a free site consultation, and we can help you understand your solar options, including whether a 6.6kW or a larger system, for example, a 10.6kW solar system, is the right choice.
The installation process starts with an assessment in which one of our fully qualified technicians will assess your property to determine the best location for the panels and assess any issues that could impede solar performance.
We obtain any permits required from energy retailers and the local network authority to ensure compliance. As approval requirements vary by location, working with an experienced local installer makes for a seamless process.
It generally takes a single day to complete a 6.6kW solar system (solar panels, solar inverter, and mounting racks) installation. However, more complex solar designs will usually involve a longer installation process.
To ensure optimal performance in the long term, regular and ongoing solar system maintenance is essential. This generally includes cleaning the panels and ensuring that birds and pests haven't nested around the panels.
More and more Aussie households have battery storage in mind when buying a solar system. If you’re considering adding a solar battery, either now or in the future, the smallest size we recommend is 6.6kW. A system this size may not produce enough energy in winter or cloudy weather to fully charge a battery, but many households combine a battery with periods of cheap daytime electricity to keep their battery topped up. If this is a consideration for you, don’t hesitate to reach out to the team to discuss your requirements and the solutions available.
As a leading solar system service provider, you can rest assured that your solar installation is covered by a competitive warranty when you work with MLEC Solar. What’s more, as we use only high-quality products, every component in your new 6.6kW solar system is covered by a warranty.
A 6.6kW solar system will save you money, but the amount you save depends on a range of factors, including:
Location: You’ll save more in sunny cities like Perth and Adelaide than in cities that average fewer sunny hours per day.
Energy usage: One of the most important factors that influences how much you’ll save by installing solar is your household’s electricity consumption.
Electricity & feed-in tariff rates: Grid electricity rates and feed-in tariffs directly impact how much you pay for electricity and, therefore, how much you save.
System components: As the quality of components, such as solar panels and inverters, impacts the performance of your 6.6 kW solar system, it also affects your potential savings. Installing a solar battery can also contribute to energy savings.
In Perth and Adelaide, a 6.6kW solar system generally costs between $5,500 and $8,000, with the average price sitting at about $6,500. Pricing factors that determine how much a 6.6kW solar system with battery costs include the quality of components and the installation. However, it’s important to note that higher-quality components and installations deliver a better performance, which results in higher savings.
A well-maintained 6.6kW solar system in Perth or Adelaide can last 25 years or more, with panels typically having a warranty of 25 years. Regular maintenance and monitoring can help ensure that your system operates efficiently for its entire lifespan.
Yes, it’s possible to expand your 6.6kW solar system in the future by adding more panels. However, it’s important to consult with a solar professional to ensure that your system can accommodate the additional panels and that the system remains compliant with local regulations.
No, a 6.6kW solar system won’t work during a blackout unless it is equipped with battery storage. Standard grid-tied systems are designed to shut off during a blackout for safety reasons. However, with the addition of battery storage, you can have backup power during outages, providing greater energy independence and reliability.
6.6kW solar systems require minimal maintenance. Regular inspections to check for debris buildup and occasional cleaning of the panels are typically all that’s needed. It’s also recommended to have a professional check the system annually to ensure optimal performance.
The installation time for a 6.6kW solar system can vary depending on factors such as the complexity of the installation and the weather. As a 6.6kW system is a small solar system for either residential or commercial applications, on average, the installation process takes between one and three days.
If your 6.6kW solar system produces more electricity than you use, the excess energy is typically fed back into the grid. Depending on your location, you may receive credits for this excess energy through a process called net metering. You also have the option of installing a solar battery to store the excess energy your system generates so you can use the stored energy at night or as a backup during a blackout.
Depending on location, panel angle, shading, weather, system component quality and other factors, a 6.6kW solar system generally produces between 19 and 30 kWh of electricity daily. Systems in sunny cities like Perth and Adelaide typically produce more kWh than systems in cities with higher levels of cloud cover.
Yes, while solar panels are most efficient in direct sunlight, they can still generate electricity on cloudy days. However, the amount of electricity produced may be lower compared to sunny days. Installing a solar battery enables you to store the excess energy generated on sunny days for use on cloudy days and at night.
Power your home or business with a system designed to match your energy needs. From efficient 6.6kW setups to high-capacity 39.9kW solutions, MLEC Solar offers tailored systems that maximise performance, savings, and long-term value. Get a free consultation today.
