fbpx
6.6kW solar system

How much power will a 6.6kW system produce?

Due to various factors, 6.6kW or, sometimes called, 6kW solar systems are gaining popularity among Australian households, including their affordability, proper size, and ease of approval when connected to the grid. If you consider installing a 6.6kW solar system for your home, this article describes (almost) everything you need to know, including pricing, energy production, and investment appeal.

How much energy will a  6.6kW solar system produce?

Based on many factors, the actual power output of a 6.6kW solar power system will vary. These variables include:

  •  location and local climate
  •  orientation and tilt angle of the solar panel array 
  •  there are shadows on the panels,
  •  the performance of various components (mainly panels and inverters) 

The location is one of the main factors of the solar system. The determinant of power generation is because the amount of sunlight that falls on the solar panel directly affects the system’s output. The table below provides an approximate value of the energy that a 6.6kW solar system will generate based on the Methodology Office and PVWatts. Please note that these figures are for reference only. We have tried our best to be stable in our estimates, and the system efficiency is 75%. Please also note that these figures are annual averages; energy production is highest in summer and lowest in winter.

A 6.6kW system with a 5kW inverter will generally generate enough solar power to meet the average electricity demand of Australian homes. Production depends on where you live: Melbourne’s 6.6 kW system produces 23.8 kWh of electricity per day, while Brisbane produces 27.7 kWh of electricity per day.

The table below shows how much a 6.6kW system generates in major Australian cities:

Capital CityApprox solar energy production (annual)*
Adelaide22-24kWh
Brisbane23-24kWh
Canberra22-25kWh
Darwin25-27kWh
Hobart17-20kWh
Melbourne19-22kWh
Perth24-26kWh
Sydney20-23kWh

How many Panels for a 6.6kW System

A 6.6kW system is typically made up of somewhere between 20 and 24 solar panels. The number of panels required for the 6.6kW system varies depending on the efficient panes are. For example, if you select highly efficient 330W panels, you need just 20 of them, but if you go for 275W panels, you will need 24 of them.

Cost of a 6.6kW Solar System

The cost of a high quality 6.6kW solar system is typically between $6,000 and $8,500. Many variables affect prices. The solar discount for a 6.6 kW system varies depending on where you live; some markets, like Sydney, are more competitive than others, and this will also affect prices. The biggest variable in cost comes from the quality of the solar panels you choose and the installers you choose.

Cost advantage compared to 5kW systems

There are cost advantages to selecting a 6.6kW system over a 5kW solar system as listed below:

  • You likely only need a 5kW inverter
  • You receive the rebate on the additional 1.6kW worth of panels
  • There is only a slight increase in labour time to install a larger system

6.6KW System with a 5kW inverter

In general, 6.6kw systems come with a 5 kW inverter due to the loss of panel efficiency, and some network delivery companies can not install an inverter greater than 5KW. Therefore, there is no need to pay more to the investor. He still receives his refund with additional solar panels of 1.6kw. The cost of installing a 6.6kW VS 5kW system is very small. If you have an additional system, just pay more for the solar panel and some small additional installation costs.  

Read our blog on


What can I run with a 5kw solar system?

Leave a Reply

Your email address will not be published.