SOLAR PANEL
40KW
Best For large shops and clinics
$16,599*
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40kW Solar System
If you’re running a medium to large business in Australia, switching to solar isn’t just a smart move — it’s almost becoming a no-brainer. And if you’re eyeing something like a 40KW solar system, you’re probably serious about cutting your electricity costs and reducing grid dependency.
This system size fits nicely in that “just big enough” sweet spot. It’s not a massive solar farm, but it’s definitely commercial-scale. Let’s walk through the key things you need to know before deciding if this is the right system for your business or property.
$16,599
Installed price (after STC rebate)
114–181
1.4–2.5 yrs
$260k+
What Is a 40kW Solar System?
A 40kW solar system is a medium-scale commercial solar installation that sits between the small-business 30kW range and the larger industrial 50kW–100kW tier. At this capacity, the system generates 114–181 kWh of electricity per day depending on location — enough to power most medium-sized Australian businesses almost entirely during operating hours.
A fully installed 40kW system from Aussie Solar Tech includes 80–105 Tier 1 solar panels, a premium commercial-grade three-phase inverter (or multiple inverters), commercial roof-mount hardware, smart monitoring with commercial dashboards, grid protection equipment compliant with AS 4777, and a full DNSP connection managed end-to-end by our SAA-accredited commercial team.
40kW vs 30kW vs 50kW — which is right?
A 40kW system is the practical midpoint for businesses consuming 120–200 kWh per day during operating hours. If your usage is below 100 kWh/day, a 30kW system will deliver better self-consumption rates and faster payback. If you regularly exceed 200 kWh/day, a 50kW system will better match your load. Our commercial team will model your exact usage before recommending a size.
Discover The Best Solar Panel System For Your Home And Business
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
10KW
Solar System
Just right for most family homes
$
5,999
*
Small Home
- Tier 1 Solar Module
- 5kW Power Inverter
- 10,000w Tier 1 Panels
- High Efficiency Solar Module
13KW
Solar System
Medium homes and small business
$
7,599
*
Medium Home
- Tier 1 Solar Module
- 8kW Power Inverter
- 13,000w Tier 1 Panels
- High Efficiency Solar Module
20KW
Solar System
Larger homes and small businesses
$
10,299
*
Big Family Home
- Tier 1 Solar Module
- 10kW Power Inverter
- 20,000w 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.
Who Needs a 40kW System? Business Types & Use Cases
A 40kW system delivers outstanding returns for any business with consistent, high daytime energy consumption between 120 and 200 kWh per day. The higher your daytime usage relative to your total consumption, the faster your payback. Below are the most common business types Aussie Solar Tech installs 40kW systems for across Australia.
Small to Medium Factories: Machinery, compressors, conveyor systems, and process equipment running day shifts align perfectly with peak solar output for high self-consumption.
Large Supermarkets & Retail: Refrigeration, lighting, HVAC, and check-out systems running 10+ hours a day deliver consistent high daytime loads and very fast solar payback.
Agricultural Operations: Irrigation pumps, cold storage, processing equipment, and sheds. Many farms in QLD, NSW, and WA achieve sub-2-year payback due to high daytime pump loads and abundant sunshine.
Gyms & Fitness Centres: HVAC, pool heating, hot water, and lighting across large floor spaces running from early morning to evening make gyms an excellent 40kW system candidate.
Large Hospitality Venues: Commercial kitchens, cool rooms, function spaces, HVAC, and bar/cellar refrigeration create sustained daytime loads across hotels, clubs, and large restaurants.
Medium Schools & Universities: Classrooms, laboratories, dining halls, sports facilities, and administration buildings running during school hours — peak usage perfectly matched to peak solar generation.
Self-consumption is critical at 40kW
Most Australian DNSPs do not pay meaningful feed-in tariffs for commercial systems above 10kW. A 40kW system only delivers strong ROI when your business consumes the majority of its 114–181 kWh daily output during operating hours. If your daytime self-consumption is below 60%, consider a smaller 30kW system or add battery storage to capture surplus generation.
Panels & Roof Space Required For 40kW Solar System
The number of panels and roof space required for a 40kW system depends on the wattage of panels selected. Higher-wattage panels reduce panel count and roof space needed, though they carry a slight premium. Modern commercial panel wattages typically range from 400W to 500W+.
Panel Count & Roof Area
| Panel Wattage | Panels Required | Approx. Roof Area | Best For |
|---|---|---|---|
| 400W | 100 panels | ~170 m² | Standard commercial installations |
| 420W | 96 panels | ~163 m² | Most common — good efficiency/price balance |
| 450W | 89 panels | ~151 m² | Higher efficiency, space-limited roofs |
| 500W | 80 panels | ~136 m² | Premium / bifacial / large-format panels |
| 550W+ | 73 panels | ~124 m² | High-efficiency commercial, flat roofs |
*Roof area includes 300mm inter-panel clearances, perimeter setbacks per AS/NZS 5033, and access pathways. Flat commercial roofs with tilt frames require an additional 20–30% space for row spacing to prevent self-shading.
40kW Solar System Cost in Australia
Aussie Solar Tech’s fully installed price for a 40kW commercial solar system starts from $16,599 (after the federal STC rebate, ex GST). The table below compares our pricing against market averages across capital cities to give you full transparency on what a competitive installed price looks like in your city.
What's included in our $16,599 price?
Tier 1 commercial panels (CEC approved) · Premium three-phase inverter · SAA-accredited commercial installation · Commercial roof-mounting hardware · Grid protection & DNSP connection · Commercial monitoring system · STC rebate paperwork handled · Standard single-storey flat or pitched roof.
| City | Aussie Solar Tech | Market Average (Apr 2025) | Your Saving |
|---|---|---|---|
| Sydney, NSW | $16,599 | $33,500 | ~$16,901 |
| Melbourne, VIC | $16,599 | $32,000 | ~$15,401 |
| Brisbane, QLD | $16,599 | $36,800 | ~$20,201 |
| Adelaide, SA | $16,599 | $36,600 | ~$20,001 |
| Perth, WA | $16,599 | $35,700 | ~$19,101 |
| Canberra, ACT | $16,599 | $40,200 | ~$23,601 |
| Hobart, TAS | $16,599 | $38,100 | ~$21,501 |
*Market average figures based on Solar Choice Commercial Price Index scaled for 40kW, April 2026. All prices include federal STC rebate and are ex GST. Final Aussie Solar Tech pricing may vary for multi-storey or complex buildings, tilt-frame requirements, switchboard upgrades, cable distance, and premium equipment.
Additional Costs to Budget For
| Item | Typical Cost Range | When Required |
|---|---|---|
| Switchboard / main upgrade | $800–$3,500 | Outdated switchboard |
| Tilt frames (flat commercial roof) | $3,000–$7,000 | All flat commercial roofs |
| Extended cable runs (>30m) | $800–$3,000 | Large or complex buildings |
| DNSP application fee | $400–$1,500 | Some states / networks |
| Protection relay (some DNSPs) | $1,500–$3,500 | Network-specific requirement |
| Commercial battery storage | $20,000–$55,000 | Optional — for evening coverage |
Quick Summary: 40kW Solar System Price Australia 2026
– Base installed price: $16,499 (after STC rebates)
– Market average across capital cities: $32,000–$40,000
– Your saving with Aussie Solar Tech: Up to $23,500
– Payback period: 1.5–3.0 years (business use)
– Estimated 25-year savings: $260,000+
– STC rebate value: $10,500–$15,500 (pre-applied)
Daily Energy Output by City — BOM Data
Output figures below are based on Bureau of Meteorology (BOM) solar irradiance data and PVWatts v8 modelling, assuming a north-facing array, 15°–20° tilt on a commercial pitched or tilt-framed roof, and 77% system efficiency. These are conservative annual averages — summer output will be 20–40% higher, winter 20–40% lower.
| City | Peak Sun Hours/Day | Avg Daily Output | Annual Output | Data Source |
|---|---|---|---|---|
| Darwin, NT | 5.5 hrs | 157–181 kWh/day | ~62,270 kWh/yr | BOM/PVWatts v8 |
| Brisbane, QLD | 5.0 hrs | 144–163 kWh/day | ~56,435 kWh/yr | BOM/PVWatts v8 |
| Perth, WA | 4.9 hrs | 153–175 kWh/day | ~59,860 kWh/yr | BOM/PVWatts v8 |
| Adelaide, SA | 4.8 hrs | 145–163 kWh/day | ~56,435 kWh/yr | BOM/PVWatts v8 |
| Sydney, NSW | 4.6 hrs | 136–151 kWh/day | ~52,560 kWh/yr | BOM/PVWatts v8 |
| Canberra, ACT | 4.6 hrs | 144–165 kWh/day | ~56,435 kWh/yr | BOM/PVWatts v8 |
| Melbourne, VIC | 4.2 hrs | 125–144 kWh/day | ~49,275 kWh/yr | BOM/PVWatts v8 |
| Hobart, TAS | 3.8 hrs | 114–132 kWh/day | ~45,260 kWh/yr | BOM/PVWatts v8 |
*Assumes north-facing roof at 15°–20° tilt, 77% system efficiency, no shading. Based on BOM solar irradiance data and PVWatts v8 modelling. Real-world output varies with soiling (~2–3% annual loss without cleaning), temperature derating (~10–15% in peak summer), inverter efficiency, and panel degradation (~0.5%/yr).
Payback Period & ROI by City
The payback table below models returns for a medium business consuming 160 kWh per day (typical for a medical centre, large retail store, or light manufacturing plant), at 70% and 90% daytime self-consumption. Commercial electricity rates are used. All figures are based on Aussie Solar Tech’s installed price of $16,599 and exclude tax benefits.
| City | System Cost | Elec. Rate | Self-Consumption | Annual Savings | Payback (Pre-tax) |
|---|---|---|---|---|---|
| Sydney | $16,599 | 28c/kWh | 70% | $9,742 | 1.8 yrs |
| Sydney | $16,599 | 28c/kWh | 90% | $12,527 | 1.4 yrs |
| Brisbane | $16,599 | 25c/kWh | 70% | $8,698 | 2.0 yrs |
| Brisbane | $16,599 | 25c/kWh | 90% | $11,183 | 1.5 yrs |
| Melbourne | $16,599 | 22c/kWh | 70% | $6,914 | 2.5 yrs |
| Melbourne | $16,599 | 22c/kWh | 90% | $8,890 | 1.9 yrs |
| Adelaide | $16,599 | 34c/kWh | 70% | $10,793 | 1.6 yrs |
| Adelaide | $16,599 | 34c/kWh | 90% | $13,878 | 1.2 yrs |
| Perth | $16,599 | 30c/kWh | 70% | $10,180 | 1.7 yrs |
| Perth | $16,599 | 30c/kWh | 90% | $13,089 | 1.3 yrs |
| Canberra | $16,599 | 28c/kWh | 70% | $9,938 | 1.7 yrs |
| Canberra | $16,599 | 28c/kWh | 90% | $12,777 | 1.3 yrs |
*Assumes 160 kWh/day business consumption. Electricity rates based on competitive commercial market offers, April 2025. No feed-in tariff credit assumed above 10kW. Pre-tax only — commercial depreciation and Instant Asset Write-Off benefits not included. Request a personalised business case.
STC Rebate & Government Incentives
The federal government’s Small-scale Technology Certificate (STC) scheme applies to all solar systems under 100kW, including 40kW commercial installations. The STC value for a 30kW system is substantial — typically $11,000–$16,000 depending on your location zone and current STC spot price.
All Aussie Solar Tech prices have the STC rebate pre-applied — the $16,599 you see is what you pay after the rebate is deducted. We handle all STC paperwork at no additional charge.
Battery Storage for 40kW Systems
Given that commercial systems above 10kW receive little or no feed-in tariff for grid export, pairing a 40kW system with battery storage is the single most effective way to capture the full value of your solar generation. Rather than exporting surplus at near-zero rates, you store it and deploy it during evening peak-rate periods or overnight at 22c–35c/kWh.
| Battery Capacity | Evening Coverage | Ideal Business Type | Approx. Additional Cost |
|---|---|---|---|
| 20–30kWh | ~2–3 hrs evening | Offices & retail closing at 6–7pm | $15,000–$28,000 |
| 40–60kWh | ~4–6 hrs evening | Hospitality, extended trading hours | $28,000–$50,000 |
| 60–100kWh | Full overnight coverage | 24/7 operations, cold storage, hotels | $45,000–$75,000 |
| 100kWh+ | Multi-day backup capability | Critical operations, remote sites | $70,000+ |
For most medium businesses, a 40–60kWh commercial battery paired with a 40kW solar system delivers the strongest combined ROI — capturing evening peak-rate savings while keeping storage costs proportional. See our 60kWh battery guide and 100kWh battery guide for detailed commercial pricing and payback analysis.
Battery incentives — act before 1 May 2026
The Australian government’s commercial battery rebate scheme reduces significantly from 1 May 2026. Businesses installing commercial battery storage before this date lock in maximum incentives. Contact us for a combined 40kW solar + battery commercial quote.
Frequently Asked Questions
How much does a 40kW solar system cost in Australia?
Aussie Solar Tech’s fully installed 40kW commercial solar system starts from $16,599 after the federal STC rebate (ex GST). Market averages across Australian capital cities typically range from $32,000–$40,000 depending on installer, equipment tier, and location. Our price includes Tier 1 panels, a premium three-phase inverter, SAA-accredited installation, DNSP connection management, and all compliance documentation.
How much energy does a 40kW solar system produce per day?
What is the payback period for a 40kW solar system?
How many solar panels does a 40kW solar system require?
Why Choose Aussie 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.
We Install CEC Approved Popular Solar Panels In Australia
We install CEC-approved solar panels from trusted brands including SunPower, REC, AIKO, Canadian Solar, Trina Solar, LONGi Solar, Jinko Solar, and JA Solar.
These brands are chosen for their performance, reliability, and suitability for Australian conditions.
