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A Comprehensive 6.6kW Solar System Review

6.6kW Solar System Installation Australia

Considering powering your home with solar energy? The 6.6kW solar system has become a top choice for many Australian residents—and for good reasons. Its affordability, generous capacity, and hassle-free grid connection process make it an attractive option. 

If you’re considering integrating battery storage or backup, this system perfectly suits the task. This thorough system review is your guide to understanding the ins and outs of a 6.6kW solar installation, its benefits, and how to maximise its capabilities.

Learn more about 6.6kW solar systems from its essential elements, technical aspects, features and financial benefits. By the end of this article, you will have the knowledge you need to make an informed decision for your solar investment.

Introducing the 6.6kW Solar Systems

A 6.6kW solar system is a robust and efficient solution for harnessing solar energy, offering a significant power generation capacity. This system typically includes a number of solar panels that, together, are capable of producing up to 6.6 kilowatts of power under optimal conditions. It’s an ideal choice for homeowners in Australia, fitting a variety of residential energy needs.

Far from just storing energy, the primary function of a 6.6kW solar system is to convert sunlight into electricity, which can be used immediately, stored in a battery system, or fed back into the grid. The choice of integrating battery storage offers the flexibility to use solar energy during nighttime or on cloudy days, enhancing the system’s utility. if you are interested in a solar battery, you can compare solar batteries here.

This solar system size is particularly popular in Australia due to its ability to efficiently meet the average electricity demands of a household. It strikes a perfect balance between high energy yield and cost-effectiveness, making it an environmentally friendly and economically savvy choice for sustainable living.

Importance of Sizing in Solar Systems

Sizing plays a crucial role in the performance and effectiveness of your solar system. The size of your solar array, in kilowatts (kW), determines how much energy it can generate. Getting the right balance when sizing your solar system is important to ensure it meets your energy needs while maximising efficiency.

Under-sizing your system could mean it won’t produce sufficient electricity to meet your consumption needs, resulting in missed opportunities to save on your electricity bills and reduce your carbon footprint. On the other hand, an excessively large system can result in a surplus of energy, leading to inefficiency and unnecessary expenses.

Benefits of 6.6kW Solar System 

The 6.6kW solar system has gained popularity across Australia for several reasons. Below are some of them.

Cost-Effectiveness and Energy Savings

A primary benefit of the 6.6kW solar system is the potential for significant savings on electricity bills. It is capable of meeting a large portion of the average household’s daily energy needs, reducing reliance on more expensive grid power. In areas with net metering, homeowners can also earn credits or income by feeding excess power back into the grid, enhancing the system’s financial returns.

Environmental Impact

Choosing a 6.6kW solar system substantially reduces a household’s carbon footprint. By utilizing renewable solar energy instead of traditional fossil fuels for electricity, these systems significantly decrease greenhouse gas emissions. This shift plays a crucial role in combating climate change and promoting cleaner air.

Energy Independence and Reliability

The flexibility of a 6.6kW solar system is another key advantage. Homeowners can integrate battery storage, ensuring a consistent energy supply during nighttime or cloudy weather and providing energy independence. This is particularly beneficial during power outages, as the system ensures a continuous power supply.

Longevity and Efficiency

Modern advancements in solar technology have made 6.6kW systems more efficient and durable. These systems typically have a long lifespan with minimal maintenance requirements, making them a worthwhile long-term investment in sustainable energy. This reliability further increases the appeal of 6.6kW solar systems as a cost-effective and environmentally friendly energy solution.

Features of the 6.6kW Solar Panel System

If you’re thinking about getting a 6.6kW solar panel system for your home or business, understanding its various features is crucial to ensure it meets your specific requirements. Here are the key features of a 6.6kW solar panel system.

Technical Specifications

  • Number of Panels: The system consists of multiple solar panels, often varying in number depending on their wattage and the specific configuration of the installation. More panels generally mean higher energy output.
  • Inverter Capacity: A crucial component of any solar panel system is the solar inverter, which converts the direct current (DC) generated by the panels into the alternating current (AC) used in homes. The inverter’s capacity should be sufficient to handle the combined output of all the panels.

Panel Efficiency and Output

Solar panels are designed for their high efficiency in converting sunlight into electricity. This means they can capture more energy from the sun even during less-than-ideal weather conditions, making them well-suited to Australia’s varying climates.

A 6.6kW solar panel system can produce substantial electricity, especially in regions with abundant sunlight. This capacity equips your home to satisfy its energy demands, reducing grid dependence and leading to cost savings.

Understanding the Basics

Knowing the basics is the first step in making an informed decision about investing in solar panels. Here are the primary aspects you need to know when considering a 6.6kW solar panel system.

Panel Count

The number of panels required for a 6.6kW system can vary depending on the type and efficiency of the panels you choose. Generally, a 6.6kW system may consist of approximately 14 to 18 solar panels, each with an average capacity of 400-500 watts. 

The exact panel count may differ based on factors such as panel wattage, local climate conditions, and your energy consumption goals.

Space Requirements

As a rough estimate, a 6.6kW system typically requires around 36-48 square meters of roof space. This area can vary based on panel size and orientation, so consulting a professional solar installer is advisable. They can assess your specific roof layout, shading, and other local factors to provide an accurate assessment of the space needed for your solar system.

The Price Breakdown of 6.6kW Solar Power System

Solar panel system prices can vary depending on various factors, and knowing what goes into the overall cost can help you make an informed decision. Let’s break down the expenses associated with a 6.6kW solar system. 

Solar Panels

The biggest portion of the cost is the solar panels themselves. Prices can vary based on the brand, type, and efficiency of the panels you choose. The cost of panels for a 6.6kW system will depend on the number of panels and their wattage.

A good solar system can cost anywhere from $800 to $1,200 per kilowatt. An entire 6.6kW system will range between $5,200 and $8,000.


An inverter is a crucial component of your solar system, as it converts the direct current (DC) produced by the panels into the alternating current (AC) used in your home. An inverter can cost around $1,500 to $6,000 and comes in different sizes and types, and their capacity and features influence their cost.

Looking for an inverter available in Australia? Check out our page on Solar Inverters.

Mounting and Racking

The cost of mounting and racking depends on factors such as the type of roof you have, the complexity of the installation, and any additional features like tracking systems for optimising panel angles. For 6.6kW systems, the average price for a complete installation is between $5,500 – $9,000.

Check out our solar mounting and racking options.

Installation Labour

Hiring a professional installer is essential for a safe and efficient installation. The cost of labour can vary based on the complexity of the installation, your location, and the installer’s expertise.

The labour cost for a 6.6kW can range between $4,000 to $6,000. It’s important not to cut corners on installation to ensure the system operates at its best.

Average Cost of 6.6kW in Major Cities 

CityAverage Price
Gold Coast$5,000
New Castle$5,891

Looking for a specific quote for a 6.6 kW solar panel? Sungain Solar has got you covered! With a wide range of solar products and services tailored to your unique needs, getting your solar solution is just a click away. 

Visit our website and hit ‘Get a quote’ to start your journey towards clean and efficient solar energy with Sungain Solar​.

Energy Production and Output

Before investing in a 6.6kW solar system, you should understand its energy production and output to know if it fits your energy needs best. 

Power Generation

A well-designed and efficiently installed 6.6kW system can generate approximately 24-32 kilowatt-hours (kWh) of electricity daily on average. Several factors, including location, weather conditions, and the efficiency of the solar panels, influence the energy production of a 6.6kW solar system.

It’s important to note that the energy output may vary throughout the year due to seasonal changes in sunlight hours and angles. You can balance these variations through net metering or energy storage systems to ensure a consistent power supply.

Boosting Output

When you oversize a solar system, you’re essentially installing more solar panels than your immediate energy requirements demand. While this might seem not ideal, there are several reasons why oversizing can be a strategic decision:

  • Capturing Excess Energy:Installing a larger system can harness more energy when conditions are optimal. This excess energy can be stored in batteries during nighttime or cloudy days for a continuous power supply.
  • Maximising Solar Feed-In Tariffs: In many parts of Australia, excess energy can be fed back into the grid, earning you feed-in tariffs or credits. You can make money from your solar investment by producing more energy than you consume.
  • Future-Proofing:Oversizing increases energy production as your electricity needs grow over time. It future-proofs your system, ensuring it remains a cost-effective solution as your household or business expands.
  • Optimising Energy Self-Sufficiency:Oversizing and coupling a system with energy storage can boost energy self-sufficiency. This means relying less on the grid, saving money, and reducing your carbon footprint.

The Role of Inverters To 6.6KW Solar Systems 

Inverters are the unsung heroes of solar energy systems. Here’s why they matter, especially in 6.6kW solar setups. 

  • DC to AC Conversion: Solar panels produce electricity in DC, but most of our appliances and the grid operate on AC. Inverters transform the DC electricity into AC, making it usable in your home and ensuring compatibility with the grid.
  • Optimising Efficiency: Inverters are responsible for optimising the efficiency of your solar system. High-quality inverters can maximise the energy harvested from your panels, ensuring you get the most out of your investment.
  • Monitoring and Maintenance: Modern inverters now have monitoring capabilities, allowing you to track your energy production and system performance. This feature is essential for identifying and addressing any issues quickly.
  • Grid Interaction: Inverters enable your system to interact with the grid, allowing for net metering and potentially feeding excess energy back into the grid, earning you credits or payments.

Sizing Considerations

Inverters are one of the critical components of a solar power system. Matching your inverter’s capacity to your solar system’s size is essential. It’s a standard for 6.6kW solar systems to have 5kW inverter which can be overpowered to match the 6.6kW system.

You also have a choice between string inverters and microinverters. String inverters are cost-effective and suitable for most installations, while microinverters offer panel-level optimisation and may be a better option if your system experiences shading issues.

Inverters are long-term investments, so choosing a reliable product with a good warranty is essential. Many reputable manufacturers offer warranties ranging from 5 to 10 years or more. Consider the warranty period and the manufacturer’s reputation for reliability and customer support.

The Advantage of Pairing a 6.6kW System with Batteries

Adding energy storage in the form of batteries to your 6.6kW solar system offers several advantages:

  • Energy Self-Reliance: Energy storage allows you to store excess electricity. This lessens your dependence on the electrical grid and guarantees a consistent power source, even during periods without sunlight.
  • Energy Backup: In case of power outages, battery systems can act as backup power sources, keeping important appliances running. This can be particularly advantageous during extreme weather events or unexpected grid failures.
  • Optimal Use of Solar Energy: By storing excess solar energy, you maximise your self-consumption of clean energy.
  • Grid Interaction: Depending on your location and utility company, you can use grid interaction and sell excess energy stored in batteries back to the grid.
  • Environmental Benefits: By relying more on stored solar energy, you decrease greenhouse gas emissions and reduce dependence on fossil fuels, promoting a more sustainable energy future.

Considering Bigger Options

Incorporating additional panels into your solar system can unlock the potential for more electricity generation. This is advantageous if your energy demands are higher or you aim to produce surplus energy to feed back to the grid.

This growth can shorten the time it takes to recover your initial investment as you generate more energy with the expanded panel system. The savings on your electricity bills and potential feed-in tariff income ensure a quicker return on your solar system investment.

This flexibility ensures that your solar investment remains viable and adapts to changing requirements, promoting long-term sustainability and efficiency. The table below shows kW per solar panel’s average cost, energy output, and lifespan.

Average CostDaily Energy OutputLifespan
6.6kW$5,000- $9,00026 – 33 kWh20 – 30 years
10kW$9,500 – $17,50040 – 50 kWh25 – 30 years
20kW$20,000 – $40,00080 – 100 kWh25 – 30 years

Factors Affecting Performance of 6.6kW 

A lot of factors can influence the performance of a 6.6kW solar system. Understanding these factors is crucial for optimising the efficiency and effectiveness of your system. Here are some key elements that can affect the performance of a 6.6kW solar system.

  • Sunlight Availability: The amount of sunlight your location receives directly impacts your system’s performance. Australia is known for its abundant sunlight, but its specific sunlight hours and intensity vary by region. Areas with more sunlight generally generate more electricity.
  • Panel Quality and Efficiency: The quality and efficiency of the solar panels used in your system play a significant role in energy production. High-quality, efficient panels capture more energy from the sun, even under less ideal conditions.
  • Panel Orientation and Tilt: The direction and tilt of your solar panels influence their exposure to sunlight. Proper panel orientation (north-facing in the southern hemisphere) and an optimal tilt angle can maximise energy production.
  • Shading: Shading from nearby trees, buildings, or other obstructions can significantly reduce your solar system’s performance. Ensuring that your panels remain unobstructed is crucial for optimal energy production.
  • Maintenance and Cleaning: Regular maintenance and cleaning of the panels are essential for optimal performance. Dust, dirt, and debris on the boards can reduce energy production.
  • Temperature: Solar panels can become less efficient as temperatures rise. Excessive heat can affect the panels’ output.
  • Local Climate and Weather: Weather conditions can impact daily energy production. Cloudy days or heavy rain can reduce energy generation. However, Australia’s diverse climate generally allows for reliable solar energy production.

Financial Benefits

Investing in a 6.6kW solar system in Australia not only reduces your carbon footprint but also offers substantial financial advantages like reduced electricity bills, ROI, and feed-in tariffs.

One of the primary financial benefits of a 6.6kW solar system is the significant reduction in electricity bills. By generating electricity from the sun, you rely less on the grid, resulting in lower monthly expenses. 

A 6.6kW solar system also represents a substantial investment upfront but pays off over time. The ROI can be impressive, with many homeowners and businesses recouping their initial investment within a few years. Afterwards, you enjoy years of virtually free electricity.

In some Australian states, you can earn money by selling excess solar energy back to the grid through feed-in tariffs. This can further boost your savings and the return on your investment, especially if your system generates more electricity than you consume.

Available Rebates For Australian Homeowners

There are several solar rebates and incentives available for you to encourage the adoption of solar energy and energy-efficient practices. These rebates are designed to make renewable energy solutions more accessible and affordable.

  1. Small-scale Technology Certificates (STCs): Australia’s Renewable Energy Target (RET) program offers STCs as a financial incentive for installing small-scale renewable energy systems, including solar panels. The number of STCs you receive is based on the system’s capacity and your location. You can trade these certificates or sell them to help reduce the upfront cost of solar installations.
  2. Feed-in Tariffs (FiTs): Some Australian states and territories offer feed-in tariffs, where you are paid for excess electricity generated by their solar systems and fed back into the grid. The rates and eligibility criteria can vary by region.
  3. State Government Rebates: Various state governments offer additional incentives and rebates to promote renewable energy adoption. Examples include the Victorian Solar Homes Program and the South Australian Home Battery Scheme.
  4. Home Battery Schemes: Several states, such as South Australia and New South Wales, have introduced schemes that provide rebates and low-interest loans for home battery installations. These batteries allow you to store excess solar energy for later use, increasing your self-consumption.
  5. Green Loans: Here at Sungain Solar we can help you secure green loan financing.

Check out our article on Australian solar rebates to learn more about how they work and how to apply..

Customer Support and Warranty Details in Australia

Investing in a solar power system is not merely about harnessing clean and renewable energy; it’s also about ensuring peace of mind and long-term reliability. Here are critical factors to help you make informed decisions to safeguard your investment.

  1. Workmanship Warranty: Here at Sungain Solar we offer an industry leading 17 year platinum warranty on the workmanship of your solar installation.
  2. Manufacturer and Installer Warranties: Solar panel manufacturers offer warranties on their panels, often ranging from 10 to 25 years.
  3. Consumer Guarantees: In Australia, consumers have specific guarantees and rights under Australian Consumer Law, which may apply to your solar system.
  4. Customer Support: Many reputable solar companies in Australia provide customer support for inquiries, issues, and warranty claims. Ensure you have contact information for your installer or manufacturer in case you need assistance.
  5. Professional Maintenance Services: Some solar companies offer ongoing maintenance and service plans. Consider whether such plans are available and beneficial for your system.

Make The Switch Today!

The time to make the switch to solar is now. By choosing a 6.6kW system for your home, you’re investing in a sustainable and cost-saving future. Your decision to embrace solar energy will benefit your finances and contribute to a cleaner and greener environment. It’s a win-win opportunity you don’t want to miss!

SunGain Solar can help you start your solar journey!

Contact us today and talk to our experts for a free, no-obligation consultation.

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