27 June 2024
How Much Power Does a 6.6kW Solar System Produce Per Day

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If you’re considering installing a 6.6kW solar system in Australia, you’re likely curious about how much power it will generate on a daily basis. This size is popular due to its ability to meet the electricity needs of an average Australian household. Let’s get into the specifics of 6.6kW solar systems, providing insights into daily power production, factors affecting output, and the benefits of this system size for Australian households.

Daily Output of a 6.6kW Solar System

On average, a 6.6kW solar system in Australia produces between 22 to 26 kilowatt-hours (kWh) of electricity per day. However, this range can vary significantly based on several factors such as geographic location, weather conditions, and system efficiency.

Daily Power Production by Australian Cities

A 6.6 kW solar system in Australia typically produces between 22.5 to 29.0 kWh per day, depending on the location.

Here are the average daily power outputs for a 6.6kW solar system in major Australian cities:

  • Adelaide: 24-26 kWh
  • Brisbane: 25-27 kWh
  • Canberra: 24-27 kWh
  • Darwin: 28-30 kWh
  • Hobart: 19-22 kWh
  • Melbourne: 21-24 kWh
  • Perth: 26-28 kWh
  • Sydney: 22-25 kWh

These values are indicative and can vary based on specific conditions like local weather patterns and seasonal changes. For example, in Brisbane, the system might generate around 27.7 kWh on a sunny day, while in Melbourne, it might produce about 23.8 kWh per day.

Factors Affecting Solar Power Production

Several factors influence the amount of electricity your 6.6kW system can produce:

1. Climate and Location

Areas with more sunny days naturally yield higher solar energy production. Conversely, regions with frequent cloudy days will see reduced output.

2. Roof Orientation and Tilt

The positioning and angle of your solar panels are crucial. Panels should ideally face north in Australia to maximize sunlight capture throughout the day. Additionally, the tilt angle should be optimized to your location’s latitude.

3. Solar Panel Efficiency and Quality

The make and model of your solar panels affect efficiency. Modern panels typically range from 300W to 400W per panel. A 6.6kW system usually comprises 15 to 20 panels, depending on their efficiency.

How Many Solar Panels Make Up a 6.6 kW Solar System?

A 6.6 kW solar system typically consists of 15 to 20 solar panels. The exact number of panels depends on the wattage of the individual panels used.

For instance:

If 330W panels are used, you will need 20 panels (6.6 kW / 0.33 kW = 20).

If 400W panels are used, you will need 16-17 panels (6.6 kW / 0.4 kW ≈ 16.5).

The number of panels required can vary slightly based on the efficiency and specific make of the panels used.

How Much Does a 6.6 kW Solar System Cost in Australia?

The cost of a 6.6 kW solar system in Australia typically ranges from $5,500 to $8,000. Several factors influence this price, including:

Quality of Panels and Inverter: Higher-quality components tend to be more expensive but offer better efficiency and longevity.

Installation Costs: Professional installation can vary in price based on the installer and complexity of the setup.

Rebates and Incentives: Federal and state incentives, such as the Small-scale Technology Certificates (STCs), can significantly reduce the overall cost.

Here’s a breakdown of average costs in major cities:

  • Adelaide: Approximately $6,462
  • Brisbane: Approximately $6,343
  • Melbourne: Approximately $6,555
  • Perth: Approximately $6,270
  • Sydney: Approximately $6,330

Benefits of a 6.6kW Solar System

A 6.6kW solar system is a popular choice for Australian homes for several reasons:

  • Cost-Effective: With the federal Small-scale Technology Certificates (STCs) incentive, a 6.6kW system is often more affordable relative to its size. Prices range from $5,500 to $8,000 depending on the quality of components and the installer.
  • Optimal Size for Households: This system size typically meets the energy needs of an average Australian household, providing a good balance between cost and energy production.
  • Compatibility with 5kW Inverters: Many 6.6kW systems are paired with 5kW inverters due to Australian regulations allowing a 33% oversizing of the inverter. This setup maximizes the efficiency and cost-effectiveness of the system.


A 6.6kW solar system is a versatile and efficient option for Australian households, capable of producing between 22 to 26 kWh per day under optimal conditions. By considering local climatic conditions, roof orientation, and panel quality, homeowners can optimize their solar power production. The investment in a 6.6kW system can significantly reduce electricity bills and contribute to a more sustainable energy future.

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