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The Ultimate Guide To 9KW Solar Systems For Sydney Homes in 2024

As solar energy becomes more accessible, now's the perfect opportunity to join the clean energy movement in Sydney. A 9kW system can significantly reduce your carbon footprint while lowering your electricity costs with the help of government rebates.
Tom Sedgwick
Updated at
Reading time
3 min

The Cost of Installing a 9kW Solar System In Sydney

A fully installed 9kW system, including tier-one panels like Trina Solar, can be yours for as low as $7,700 (or around $185 per month over 5 years). While the initial cost is important, investing in premium panels such as 1KOMMA5° full black modules pays off in the long run.

In addition, these premium brands often come with comprehensive warranties and technical support, ensuring peace of mind for years to come.

A 9kW system can save you up to $3,500 annually on electricity costs, particularly if you utilise a significant amount of power during the day. For energy-conscious families, strategically using appliances during sunlight hours can maximise savings. A top-of-the-range system with smart energy usage cause a return on investment in as little as 4 years.

6kW QC EN Castle Hill

The Power Generated From A 9kW Solar System

Estimates suggest a north-facing 9kW solar system in Sydney generates around 35 kWh daily. But, homeowners may see even better results. Factors like system design and panel quality can influence output.

These factors make it important to partner with a reliable solar panel installer and retailer.

For instance, 1KOMMA5°. We focus on maximising your solar investment. Our systems, often exceeding expectations, can deliver more power thanks to high-quality components.

Many of our customers experience an average output of 110% compared to estimates. On a bright summer day, a 9kW system can even generate over 50 kWh.

While that much power is fantastic, it might be too much for some households. Splitting the panels across multiple orientations can be beneficial to ensure balanced power distribution throughout the day.

Additionally, exploring battery storage solutions allows you to utilise excess solar power during the evening.

9kW Solar System Output

Key Facts & Figures Of A 9kW Solar System

9kW System
Number of Panels21 x 440W Panels
Output35 kWh a day average (see below)
Potential Savings$700 – $900 a bill depending on your cost of power
Average Payback Period3 to 5 years
CostFrom around $7,300 to around $12,500
RepaymentsFrom around $185 a month over 5 years*
Suited toMedium to large homes using on average around 35 kWh a day during the daytime (or over 24 hours with battery storage)

* Repayment numbers are an estimate based on a 5-year term. 3-7 year terms available.

Power Bill Savings From A 9kW Solar System

The more solar energy you use during the day, the greater your savings with a 9kW system. Depending on your electricity plan, you can mostly save between 22 and 30 cents per kWh you use. Additionally, some providers offer compensation (5-13 cents per kWh) for excess power returned to the grid.

On average, a 9kW system can likely cut your electricity bill by $700 to $900 per quarter. To learn more about expanding solar power savings, check out this helpful resource: How Solar Power Reduces Your Power Bill

Number of solar panels for a 9kW System

For larger solar systems, choosing high-efficiency panels offers several advantages:

  1. These premium panels perform better under all weather conditions, leading to consistent power generation and a more reliable system overall.

  2. Its superior efficiency allows it to convert more sunlight into electricity, improving your overall energy production.

  3. High-efficiency panels are often more compact. We can use premium solar panels, achieving similar output while consuming less roof space. This advantage can be beneficial if your roof has a limited area.

Premium Solar System: A 9kW Micro Inverter System

Enphase microinverters offer a game-changing advantage. Each solar panel can now operate independently. This attribute allows us to design innovative layouts with panels facing different directions and angles. This flexibility is particularly beneficial when:

  • Spreading Power Generation: Strategically placing some panels in varying directions helps distribute power generation throughout the day. It makes it easier for you to use more of the energy you produce. This advantage can be valuable if you're on a time-of-use billing plan with higher rates during peak afternoon hours.

  • Remedy Shaded Areas: Microinverters ensure each panel performs optimally, even if partially shaded. It helps mitigate the impact of shading on overall system output, a common challenge with traditional inverters.

That is why over 80% of our systems leverage the power of Enphase microinverters. See for yourself! Learn more about the ten main benefits of microinverter systems.

Best Value Solar System: 9kW String Inverter System

String inverters are sensitive to shade. If even one panel is shaded, the entire string's output drops to the level of the least productive panel.

String inverters can be a good choice for your 9kW system if your home meets the following:

  • Unobstructed Sunshine: Your roof receives adequate sun exposure throughout the day, with no shade falling on the panels.

  • Space Availability: Your roof can accommodate 27 to 33 solar panels installed in one or two sections.

Several inverter manufacturers have recently exited the market. Therefore, you must stick to top brands when choosing an inverter of this size. If you need warranty assistance, you can ensure reliable performance and readily available after-sales support.

Discover how much you could save with solar energy! Get a free, personalised solar quote and connect with our solar experts to explore the possibilities.

Request for a solar and home battery storage quote today to see how much you can save!


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