How Much Can You Save with a 6.6 kW vs. 10.56 kW Solar System in Brisbane?

Brisbane households and businesses are switching to solar at record speed, thanks to rising electricity bills and plenty of sunshine year-round. But when it comes to choosing the right solar system size, most people ask the same question: should I go with a 6.6 kW system or invest in a larger 10.56 kW system?

The answer depends on your energy use, budget, and long-term savings goals. Here,  we’ll break down the real savings potential of these two popular solar system sizes, compare their costs and benefits, and help you make a smart decision for your home or business.

Why Brisbane is Perfect for Solar

Brisbane enjoys an average of 5.2 hours of peak sun per day, making it one of the best places in Australia for solar energy production. With the right solar panels and efficient solar inverters, households can generate more than enough power to cover daily electricity needs—and even feed excess energy back to the grid.

This means both residential solar power users and commercial solar power customers can expect strong savings and fast payback times.

Understanding the 6.6 kW Solar System

The 6.6 kW system is one of the most popular sizes for Australian homes. Here’s why:

• Typical setup: Around 15–18 solar panels (370W–440W each).
  
  
• Average daily output in Brisbane: 24–27 kWh.
  
  
• Best for: Small to medium households using 20–30 kWh of power per day.
  
  

Savings with a 6.6 kW system

Let’s assume the average electricity rate in Brisbane is $0.30 per kWh.

• Daily output: ~25 kWh
  
  
• Annual output: ~9,125 kWh
  
  
• Annual savings: 9,125 × $0.30 = $2,737.50
  
  

That’s nearly $2,700 off your power bills every year.

And with Queensland’s feed-in tariffs (around 5–10 cents per kWh for exported energy), any excess power can still earn you credits.

Understanding the 10.56 kW Solar System

For larger families or small businesses, the 10.56 kW solar system is a better fit.

• Typical setup: Around 24–28 solar panels.
  
  
• Average daily output in Brisbane: 38–42 kWh.
  
  
• Best for: Large households or businesses using 35–50 kWh per day.
  
  

Savings with a 10.56 kW system

Using the same $0.30 per kWh electricity rate:

• Daily output: ~40 kWh
  
  
• Annual output: ~14,600 kWh
  
  
• Annual savings: 14,600 × $0.30 = $4,380
  
  

That’s over $4,000 saved every year—almost double the 6.6 kW system savings.

Plus, businesses can claim tax benefits and reduce overhead costs dramatically with this system.

Cost Comparison: 6.6 kW vs 10.56 kW Solar

The cost of solar has dropped significantly in recent years. Here’s a ballpark comparison in Brisbane:

• 6.6 kW system: $4,500–$6,500 (after STC rebates).
  
  
• 10.56 kW system: $8,500–$11,000 (after STC rebates).
  
  

At first glance, the 10.56 kW looks expensive. But let’s compare payback periods:

• 6.6 kW: ~$2,700 savings per year ÷ ~$5,500 cost ≈ 2–3 years payback.
  
  
• 10.56 kW: ~$4,380 savings per year ÷ ~$9,500 cost ≈ 2–3 years payback.
  
  

Both systems offer excellent returns. However, the 10.56 kW generates more long-term savings.

Which System Suits You Best?

Choosing between a 6.6 kW and 10.56 kW solar system depends on your energy use and future needs.

• Choose 6.6 kW if…
  
  
  • You are a small or medium household.
    
    
  • You consume around 20–30 kWh daily.
    
    
  • Your roof space is limited.
    
    
  • You’re looking for the most affordable option with quick payback.
    
    
• Choose 10.56 kW if…
  
  
  • You have a large family or business.
    
    
  • You use 35–50 kWh daily.
    
    
  • You want to prepare for future energy needs (like EV charging).
    
    
  • You want maximum long-term savings.
    
    

The Role of Solar Batteries and Inverters

Pairing your solar panels with high-quality solar inverters ensures efficiency and durability. Inverters convert the DC energy from your panels into AC electricity that powers your appliances.

Adding solar batteries can further boost savings by storing excess power for nighttime use, reducing reliance on the grid. With Brisbane’s energy prices rising, a battery-backed system is becoming more attractive for both households and businesses.

Residential Solar Power Benefits

Homeowners in Brisbane can save thousands of dollars annually while increasing property value. With residential solar power, you gain independence from the grid, reduce carbon footprint, and enjoy peace of mind during peak price hours.

Commercial Solar Power Benefits

Businesses in Brisbane benefit even more from larger solar systems. Electricity is often one of the biggest operating costs, and a commercial solar power setup like the 10.56 kW system can slash bills dramatically. Over a decade, businesses can save tens of thousands of dollars—making solar one of the smartest investments.

Long-Term Financial Impact

Here’s what the long-term savings look like over 10 years:

• 6.6 kW system: ~$27,000 saved.
  
  
• 10.56 kW system: ~$43,800 saved.
  
  

The difference is clear: a larger system offers more financial security, especially if your energy use grows in the future.

Why Choose Supreme Solar Power?

When investing in solar, the installer matters just as much as the system size. Supreme Solar Power provides:

• Expert advice tailored to your energy needs.
  
  
• Quality solar panels, inverters, and batteries.
  
  
• Installation for both residential and commercial projects.
  
  
• Ongoing support and maintenance.
  
  

Choosing the right partner ensures you maximise your savings and enjoy worry-free performance for years to come.

Final Thoughts

So, how much can you save with a 6.6 kW vs. 10.56 kW solar system in Brisbane?

• 6.6 kW system: Around $2,700 per year.
  
  
• 10.56 kW system: Around $4,300 per year.
  
  

Both systems pay for themselves within 2–3 years and deliver excellent returns. If you want quick savings at a lower upfront cost, 6.6 kW is the way to go. But if you want to maximise long-term savings and future-proof your property, 10.56 kW is the smarter choice.

With Brisbane’s sunny climate and rising energy costs, now is the perfect time to make the switch. Whether it’s residential solar power, commercial solar power, or advanced setups with solar inverters and solar batteries, Supreme Solar Power can help you take control of your energy future.