6.6kw Solar Systems

As a leading solar energy provider in Perth, we specialize in 6.6kW solar systems, offering tailored solutions for Western Australian homeowners. Our 6.6kW systems are designed to maximise energy production in Perth's sunny climate, helping households significantly reduce their electricity bills while contributing to a greener future. With our local expertise, we ensure each installation is optimised for the unique roofing styles and weather conditions common in Perth and surrounding areas.

6.6kw Solar System

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What is a 6.6kW Solar System?

A 6.6kW solar system is a popular choice for Australian households, particularly in sunny areas like Perth. This size balances power output and cost-effectiveness, making it ideal for many residential solar panels installations.

  • Definition and Components

    A typical 6.6kW system includes:

    • 18-24 solar panels (275W to 370W each)
    • A 5kW inverter
    • Mounting equipment
    • Wiring and electrical components

    The solar panels capture sunlight, while the inverter converts the generated DC power into usable AC electricity for your home.


  • System Size Explained

    The '6.6kW' designation indicates the system's peak power output capacity. This size is popular because it:

    • Maximises available government rebates
    • Provides sufficient power for most medium to large households
    • Offers a good balance between upfront costs and long-term savings

  • Typical Applications

    6.6kW systems are well-suited for:

    • 3-4 bedroom homes in Perth
    • Households with an average daily electricity consumption of 20-30 kWh
    • Families looking to significantly reduce grid electricity reliance

Technical Specifications of 6.6kW Systems

Understanding the technical aspects helps in making an informed decision about your solar investment.

  • Number of Solar Panels

    A 6.6kW system typically requires:

    • 18-24 panels, depending on individual panel wattage
    • Higher wattage panels mean fewer panels needed, potentially saving roof space

  • Roof Space Requirements

    On average, you'll need about 40-45 square meters of roof space. This is approximately half the roof of a typical 3-bedroom home in Perth. Factors like roof pitch and orientation can affect the exact space required.


  • Inverter Sizing

    A 5kW inverter is typically used for a 6.6kW system. There are two main types:

    • String inverters: More affordable, connect multiple panels to one central inverter
    • Microinverters: Attached to each panel, offer better performance in partial shading but at a higher cost

Energy Production of 6.6kW Solar Panel System

Understanding energy production helps set realistic expectations for your solar investment.



  • Average Daily Output

    In Perth's sunny climate, a 6.6kW system typically produces:

    • 26-30 kWh per day on average
    • Around 9,500-11,000 kWh annually
    • This can cover a significant portion of an average household's energy needs

  • Factors Affecting Energy Generation

    Several factors influence your system's actual output:

    • Roof orientation and tilt
    • Shading from nearby structures or trees
    • Panel and inverter efficiency
    • Local weather patterns

  • Seasonal Variations in Output

    Energy production varies throughout the year:

    • Summer: Highest output, often exceeding 30 kWh per day
    • Winter: Lower output, around 15-20 kWh per day
    • Spring and Autumn: Moderate output, close to the annual average

Cost Considerations for 6.6kW Solar Panels

While the upfront cost is significant, it's important to consider long-term savings.



  • Average Price Range

    In Perth, a quality 6.6kW solar system typically costs $5,000 to $8,000 after rebates. Prices vary based on component quality and installation complexity.


  • Factors Influencing Cost

    Several factors can affect the final price:

    • Quality of panels and inverter
    • Roof type and installation difficulty
    • Additional features like monitoring systems
    • Current government incentives and rebates

  • Long-Term Financial Benefits

    Investing in a 6.6kW solar system can lead to significant savings:

    • Potential to save $1,500-$2,000 annually on electricity bills
    • Payback period of 3-5 years for most Perth homes
    • Protection against rising electricity prices

Efficiency and Performance



The efficiency of your 6.6kW system plays a crucial role in its overall performance and benefits.



  • Panel Efficiency in 6.6kW Systems

    Modern solar panels used in 6.6kW systems typically have efficiency ratings between 19% and 22%. Higher efficiency panels produce more power in limited space.


  • System Performance Ratio

    A good system should have a performance ratio of 75-80%. Regular maintenance helps maintain a high-performance ratio.


  • Degradation Rate Over Time

    Solar panels gradually produce less electricity over time, with typical degradation rates of 0.5-0.8% per year. After 25 years, panels should still produce about 80% of their original output.

Comparing 6.6kW to Other System Sizes

Choosing the right system size is crucial for maximizing your solar investment.



  • 6.6kW vs. 5kW Systems

    6.6kW systems produce about 30% more energy than 5kW systems, often at a minimal cost difference due to economies of scale.


  • 6.6kW vs. 8kW Systems

    While 8kW systems produce more energy, 6.6kW systems often provide the best balance of cost and output for average homes in Perth.


  • Choosing the Right Size for Your Needs

    Consider your current and future energy consumption, available roof space, budget constraints, and energy independence goals when deciding on system size.


Future-Proofing and Upgrades



Investing in a 6.6kW system doesn't mean you're locked into that capacity forever.



  • Expandability of 6.6kW Systems

    Most 6.6kW systems can be expanded if your energy needs increase, provided there's additional roof space available.


  • Compatibility with Battery Storage

    Many 6.6kW systems are battery-ready, allowing for future storage additions as technology improves and costs decrease.

  • Smart Technology Integration

    Modern 6.6kW systems can integrate with smart home technology, offering features like real-time performance tracking and optimized energy use.

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Solar Panel Maintenance in Perth

Frequently Asked Questions About 6.6kW Solar Systems

  • Why are 6.6kW systems often paired with 5kW inverters?

    This pairing optimizes system performance and complies with Australian regulations. The slight oversizing allows for maximum energy production while staying within inverter capacity limits, ensuring efficient operation even during peak sunlight hours.


  • What is the average payback period for a 6.6kW solar system?

    In Perth, the average payback period for a 6.6kW system is typically 3-5 years, depending on your energy consumption and local electricity rates. This relatively short payback period makes it an attractive investment for many homeowners.

  • Is a 6.6kW system suitable for my household?

    A 6.6kW system is generally suitable for medium to large households in Perth with average daily electricity consumption of 20-30 kWh. However, a professional assessment of your specific energy needs and roof characteristics is recommended for the best fit.


  • Do I need a battery with my 6.6kW solar system?

    While not essential, adding a battery to your 6.6kW system can increase energy independence and maximize self-consumption. Consider factors like your energy usage patterns and budget when deciding on battery storage.


  • How does shading affect a 6.6kW solar system's performance?

    Shading can significantly reduce a 6.6kW system's output, with even partial shading on one panel potentially affecting the entire string. Microinverters or power optimizers can help mitigate shading issues in Perth installations.


  • Can I upgrade my 6.6kW system in the future if my energy needs increase?

    Yes, most 6.6kW systems can be expanded if your energy needs grow. However, factors like available roof space and inverter capacity need to be considered, and it's best to consult with a professional solar installer for upgrade options.

  • How does the performance of a 6.6kW system compare in different Australian climates?

    A 6.6kW system in Perth's sunny climate typically performs exceptionally well, producing more energy than in less sunny regions. However, system output can vary based on local weather patterns, with coastal areas potentially seeing different results than inland locations.

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