SOLAR PANEL
20KW
Best For Larger Homes
$10,299*
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20kW Solar System
A 20KW solar system might sound like overkill at first — but in today’s energy-hungry households, it’s honestly not that crazy. Especially if your electricity bills are creeping higher, or you’re planning to add an EV to the driveway soon. Many Australian families with bigger homes or home offices are going for this size not just for savings, but also for future-proofing.
You might be wondering though — is it worth the money? Do you even need that much power? And what’s the actual cost in 2025? Let’s unpack the answers.
Discover The Best Solar Panel System For Your Home And Business
10KW
Solar System
Medium homes and small business
$
5,999
*
Small Home
- Tier 1 Solar Module
- 5kW Power Inverter
- 6,600w Tier 1 Panels
- High Efficiency Solar Module
13KW
Solar System
Larger homes and small business
$
7,599
*
Medium Home
- Tier 1 Solar Module
- 8kW Power Inverter
- 10,300w Tier 1 Panels
- High Efficiency Solar Module
20KW
Solar System
Larger homes and medium business
$
10,299
*
Big Family Home
- Tier 1 Solar Module
- 10kW Power Inverter
- 13,200w Tier 1 Panels
- High Efficiency Solar Module
30kW
Solar System
small offices and retail stores
$
12,599
*
Big Family Home
- Tier 1 Solar Module
- 30kW Power Inverter
- 30,000w Tier 1 Panels
- High Efficiency Solar Module
40kW
Solar System
best for large shops and clinics
$
16,599
*
Medium Industrial
- Tier 1 Solar Module
- 40kW Power Inverter
- 40,000w Tier 1 Panels
- High Efficiency Solar Module
50kW
Solar System
warehouses and mid-size business
$
19,599
*
Huge Commercial
- Tier 1 Solar Module
- 50kW Power Inverter
- 50,000w Tier 1 Panels
- High Efficiency Solar Module
*Performance data is based on CEC guidelines and may differ depending on your location. For personalized advice on your solar requirements and potential savings, please consult with an Aussie Solar Installation expert.
Is a 20KW Solar System Too Big for Residential Use?
At first glance, 20KW might sound like something more suited for a farm or small business, right?
But actually, it’s becoming increasingly common in large Aussie households — especially ones with:
5 or more family members
Electric vehicles (or plans to buy one soon)
Heated pools or spas
High daytime usage (WFH setups, multiple aircons, etc.)
So no, it’s not “too big” anymore. If you’ve got the space and the budget, it might be a smart move — future-proofing your home for rising electricity prices.
How Much Energy Will a 20kW Solar System Produce?
The exact energy production from a 20kW solar system will vary based on your location, panel direction, roof tilt, and even the weather. On average, systems of this size can generate anywhere from 70 to 88 kWh per day, which is enough to fully power a large household or a small-to-medium business.
To give you a better idea of how it plays out in real life, here’s a city-by-city breakdown across Australia.
20kW Solar System Energy Output
| City | Average Daily Output |
|---|---|
| Perth | 88.0 kWh/day |
| Adelaide | 84.0 kWh/day |
| Brisbane | 84.0 kWh/day |
| Sydney | 78.0 kWh/day |
| Melbourne | 72.0 kWh/day |
Places like Perth and Brisbane enjoy stronger solar output, while Melbourne tends to sit lower due to fewer sunlight hours annually. These numbers are averages, and seasonal variation means you’ll get more in summer and less in winter.
That’s why many Aussie homes add a solar battery or pick retailers with high feed-in tariffs — to make sure their extra power doesn’t go to waste.
Is 20kW the Right Solar System Size for Your Business?
Whether or not a 20kW solar system is the right fit for your business really depends on a few key things — and it’s not just about going big.
- First, you’ll need enough roof space — usually around 100 to 136 square metres, depending on your panel type and whether tilt frames are needed. If space is tight, a smaller system might be more realistic.
- Second, think about your actual energy usage. In many areas, systems over 10kW don’t earn feed-in credits for excess power sent to the grid. So if you’re not using all that power yourself, you might not be getting full value from the system.
- Lastly, your budget matters. A 20kW setup is a serious investment — if you’ve got the roof space and the demand, great. But make sure your upfront spend aligns with how much energy you’ll actually benefit from.
If you’re unsure, it’s a good idea to chat with an expert at Aussie Solar Tech, who can assess your usage and help pick the right system size for your needs.
How Much Roof Space Will You Need?
This is one of the first questions installers will ask you. A typical 20KW solar system needs about 95 to 115 square metres of roof space. If you’re using high-efficiency panels, you might need fewer of them — which helps if your roof is a bit tight.
Installers will also look at your roof’s pitch, direction, and any shade issues. A north-facing roof is still the gold standard in Australia, but east-west arrays can also do well, especially if your energy usage stretches across the day.
Cost and Installation of a 20KW Solar System
As of 2025, the base price for a 20KW solar system usually starts at around A$10,299, but that’s just for the hardware. Once you factor in installation, wiring, and all the extras, most homeowners end up paying between A$11,500 and A$14,000 in total. If you want premium components — like a Fronius inverter or REC Alpha panels — expect the cost to go over A$15,000. When you’re investing this much, going cheap isn’t always the best idea. Higher quality gear tends to last longer and perform better, making it worth the extra spend.
Installation costs generally add another A$1,000 to A$3,000, depending on your location, roof type, and whether your switchboard needs an upgrade. But Clean Energy Council (CEC), and often a monitoring system so you can keep an eye on your solar power in real time. Plus, reputable installers usually handle all the paperwork needed to get your system connected to the grid.
Payback Period & Savings – Realistic Expectations
With a 20KW solar system, your savings can be pretty massive, especially if you’re using a lot of energy during the day.
Typical scenarios:
Average household: $3,000–$4,500/year in savings
With EV charging: $5,000–$6,000/year
Businesses or home offices: Even higher
Payback period? Usually between 3.5 to 6 years, depending on usage habits and feed-in tariffs.
A lot of homeowners say they feel the difference within the first year when their power bills drop dramatically.
Should You Add a Battery to a 20KW Setup?
This is one of the biggest questions solar buyers face right now. A system this size will definitely have surplus energy — especially if you’re not home during peak sunlight hours. That’s where a battery makes sense.
But it’s not cheap. Adding a decent-sized battery (like a Tesla Powerwall or similar) can cost $8,000 to $15,000 extra. That pushes out your payback time unless you’re in a region with high night-time tariffs or frequent outages. Still, some homeowners like the energy independence and backup power batteries offer — so it’s a personal call based on budget and lifestyle.
Is a 20KW Solar System Worth It?
Honestly, if you’ve got the roof space, the budget, and your home or medium-sized business racks up decent power bills — then yes, it’s a solid long-term investment. You’ll cut down your reliance on the grid, slash your electricity costs, and potentially increase the value of your property. For businesses, it’s also a great way to manage overheads and show commitment to sustainability.
Just make sure you’re working with an experienced installer. With a system this big, you really want it done right the first time — rushing into the cheapest quote can cost more in the long run.
Why Choose Able Solar Installation For Solar Panels?
Reduced Electricity Bills
Prices for electricity in Australia keep going up. With a combination of a commercial solar system and your business, you can make your own power, which will save you a lot of money on your monthly bills. Many of our customers say they save up to 70% on their monthly utility costs.
Premium Products, Guaranteed Performance
We install top-tier solar panels, inverters, and battery systems from leading global brands. Our products are built to withstand Australian weather and deliver long-lasting performance, backed by comprehensive warranties.
Brand Image and Sustainability
Going solar not only saves you money, but it also makes your brand look better when it addresses the environment. Customers, along with additional stakeholders like businesses that want to use less energy and migrate to clean energy.
Energy Independence & Stability
Solar energy makes you less reliant on the grid, which protects your business from unexpected blackouts and rate hikes, making sure that everything runs smoothly all the time.
Expert Local Installers
We are Standards Australia Approvals (SAA)-certified, and in-house installation teams work across New South Wales. With years of local experience, we handle everything—from permits and grid connections to final inspection—with professionalism and care
Unmatched 24/7 Support
As a comprehensive solar provider, we offer continuous help, support, and maintenance throughout the entire lifespan of your system.
What's We Included In Your Solar Panel Installation?
Free Site Assessment And Energy Analysis
Custom System Design And Proposal
Supply Of High-Efficiency Solar Panels And Inverter
Professional Installation By SAA-Accredited Electricians
Assistance With Rebates And Incentive Claims
System Monitoring Setup And Customer Training
Industry-Leading Warranties
Ongoing Technical Support And Maintenance Options
We Install CEC Approved Popular Solar Panels In Australia
- SunPower Solar Panel
Known for being very efficient and lasting a long time, making it perfect for both homes and businesses.
- Trina Solar Panel
Known for being reliable and providing high energy output at a low cost.
- REC Solar Panel
Delivers robust performance and an excellent warranty, making it a trusted choice for residential and commercial applications.
- Longi Solar Panel
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- AIKO Solar Panel
Provides dependable performance with a lot of energy output, focusing on solutions that are both cost-effective and eco-friendly.
- Jinko Solar Panel
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- Canadian Solar Panel
Known for producing durable, high-performance solar panels suitable for various climates and applications.
- Q CELLS Solar Panel
This panel has cutting-edge technology that makes it very efficient and effective, so it can be used in homes and businesses.