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Everything You Need to Know About a 9kw Solar System

9KW Solar System Australia

According to the Australian Energy Council, the average solar system size in Australia sits at 9.3kW, as of September 2023. This number has increased quite significantly from just two years ago, when it was only 8kW. These days, many homeowners are opting for a 9kW solar system.

This increase occurred thanks to several factors, including the advancements in technology, especially in the creation of more efficient solar panels, as well as an increase in electricity consumption and requirements. In this article, we will explain everything you need to know about a 9kW solar system and what you need to do to install one.

Who is best suited for a 9kW solar system?

A 9kW solar system is best suited for households with an average daily consumption of 32-49kWh – a number that falls in the ‘high’ category for the average Aussie household. To decide if this type of system is the right size for your home, you need to determine your average daily electricity usage by checking your most recent electricity bills. In addition to the daily consumption rate, you also need to check your budget and roof space (which will be explained below).

How much power can a 9kW solar system produce?

The amount of electricity a solar system can produce depends on several variables. This includes your location, climate conditions, the presence of any shading in the area, as well as other panel-specific factors.

The most basic factor of all is probably the location of your solar system, as this determines the amount of sunlight your system receives. The metric used for the amount of solar hits an area is called Peak Sun Hours. In a nutshell, it is defined as one hour in which the intensity of sunlight averages 1,000 Watts/metre square.

Every city and every state in Australia has a different PSH. Here’s the list of average peak sun hours in some major cities in Australia:

City, StateAverage Daily Peak Sun Hours
Darwin, Northern Territory6.2 hours
Perth, Western Australia5.5 hours
Mildura, Victoria5.5 hours
Brisbane, Queensland5.1 hours
Sydney, New South Wales4.5 hours
Melbourne, Victoria4.1 hours
Adelaide, South Australia4.8 hours
Hobart, Tasmania3.8 hours

After you figure out the number of peak sun hours in your area, you can easily estimate your solar production by multiplying it by 9kW. For example, if you live in Melbourne, Victoria, you’ll produce an estimated 36.9kWh solar per day with a 9kW solar system.

How many solar panels are in a 9kW solar system?

A 9kW solar system can consist of a varying number of solar panels, depending on the size of the panels you pick. Residential solar panels usually fall in the 330 to 440 Watts range. The bigger the power output of a solar panel, the bigger the physical size as it affects the amount of solar cells in the module.

With that being said, a 9kW solar system will use 20-27 solar panels. Here’s a more detailed list to give you an idea:

330W (27 panels to produce 8.91kW)340W (27 panels to produce 9.18kW)360W (25 panels to produce 9kW)370W (24 panels to produce 8.88kW)380W (24 panels to produce 9.12kW)390W (23 panels to produce 8.97kW)400W (23 panels to produce 9.2kW)410W (22 panels to produce 9.02kW)415W (22 panels to produce 9.13kW)420W (21 panels to produce 8.82kW)430W (21 panels to produce 9.03kW)440W (20 panels to produce 8.8kW)

How much roof space does a 9kW solar system require?

The bigger the roof you have, the more solar panels you can install. Solar installers will carry out a survey or site assessment to measure your roof. After the survey, they will provide recommendations on the type of panels you can install, along with the quantity and square metres needed.

Panels with a high power output are usually larger, making them a good choice for homes with limited roof space. On the other hand, panels with a small output are usually smaller, making them a great alternative for owners with large roofs, as they are often priced cheaper compared to the bigger panels.

In general, a 9kW solar system will require between 36 – 46 square metres of roof space, depending on your choice of panels.

Pricing, Payback, and Saving

A 9kW solar system can cost you anywhere from $7,700 for a lower-end system to $16,000 for a higher-end system, depending on the state you live in. Again, it comes back to your budget, and those numbers are after-rebates, meaning the prices have already been reduced by incentives provided by the government ( if you are eligible).

When it comes to the payback period, this can range from two to five years, depending on how you utilise your new system. When you own a home solar system, you may be generating excess power. This can either be stored in batteries or sent back to the grid for a modest credit.

On average, people with a 9kW solar system will save you $306 monthly, depending on their electricity usage.

Is a 9kW solar system right for you?

A 9kW solar system provides many benefits for homes around Australia, but is this size system worth the upfront cost? The answer comes back to you and your needs. Now that you’re fully informed about this type of system, you can make the decision that is best for your home. Sungain Solar is always here to help.

Looking for a smaller system? Learn more about our 6.6Kw Solar Systems

Looking for a bigger system? Learn more about our 12KW Solar Systems

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