How Much Do Commercial Solar Panels Cost in Australia? A Complete Price Guide

Want to Know What Commercial Solar Panels Cost? Here’s an Honest Answer

If you’re trying to work out what a commercial solar system is going to set your business back, the honest answer is that it depends on how much electricity your business uses, what size system that translates to, what your roof looks like, and what equipment goes into it. There’s no single price that applies to every business, and any quote that arrives without a site assessment and energy review behind it should be treated with some scepticism.

This guide cuts through the noise - real cost ranges by system size, the factors that move quotes up or down, the rebates worth knowing about, and what separates a good commercial solar quote from one that’ll cause headaches later. Sunray Power designs and installs Commercial Solar System solutions for businesses across Australia - every system built around actual business energy requirements rather than standard packages.

Typical Commercial Solar Cost by System Size

These figures give you a working range to plan around. Actual pricing for your business will depend on equipment selection, roof conditions, electrical requirements, installation complexity, and location.

System Size	Typical Business Use	Estimated Cost*
20kW	Small business/office	$18,000 – $28,000
30kW	Small warehouse / larger business	$26,000 – $38,000
50kW	Warehouse / commercial property	$40,000 – $58,000
100kW	Large warehouse / factory	$75,000 – $110,000

*Prices shown are estimates after applicable rebates. Actual costs vary depending on equipment, roof structure, electrical work, installation requirements, location, and current incentive values.

What Factors Affect Commercial Solar Panel Costs?

Two businesses in the same industry can receive quotes that look very different from each other. Here’s why:

Solar System Size

The size of the system is the single biggest driver of total cost. A 20kW system serving a small office uses fewer panels, a smaller inverter, and less labour than a 100kW system going onto a factory roof. That said, cost per watt doesn’t always scale linearly - larger systems sometimes benefit from economies of scale in equipment and installation, while others attract additional complexity costs.
For a lot of Australian businesses sitting in the small to medium bracket, 20kW to 50kW covers the range - though where exactly you land depends on what the electricity bills are saying and how much workable roof there is. Larger operations - warehouses, manufacturing facilities, commercial properties with high daytime demand - often look at 100kW and above.

Solar Panel and Inverter Quality

Not all panels and inverters are priced the same, and the difference between entry-level and premium equipment shows up both in the upfront quote and in long-term performance. Higher efficiency panels generate more electricity from the same roof space, which matters when that space is limited. A quality inverter with a strong warranty and proven reliability in Australian conditions is worth paying for - it’s the component most likely to need attention over the system’s life if you don’t.
Warranty terms matter here. Panel performance warranties typically run 25 years, while inverter warranties vary. Knowing exactly what’s covered and for how long helps you compare quotes properly rather than just comparing prices.

Roof Size and Roof Condition

A commercial roof that’s in good condition, clear of shading, and structurally sound costs less to install on than one that needs additional structural support, has access challenges, or has significant shading that complicates panel placement.
Where the roof faces and how much of it is actually usable affects both how many panels go on and how hard each one works. A clean north-facing section with no obstructions is the ideal starting point - a roof that’s broken up, partially shaded, or awkwardly oriented makes the design job harder and the output lower.

Electrical and Installation Requirements

Some commercial sites need switchboard upgrades, additional cabling, or more complex grid connection arrangements before a solar system can be connected. These aren’t costs that show up on a basic quote unless a proper site assessment has been done - which is one reason why quotes produced without a site visit are unreliable.
Installation complexity also varies. A straightforward warehouse roof with clear access is a different job to a multi-level commercial building or a site with operational constraints around when and where work can be done.

Battery Storage

Adding battery storage to a commercial solar system increases the upfront investment, but for businesses with significant electricity demand outside solar generation hours - late afternoon through evening - it can make the overall financial return stronger. A battery captures surplus solar generation that would otherwise be exported at a low feed-in rate and makes it available when grid electricity would otherwise be drawing at higher tariff rates.
Whether battery storage makes sense for a specific business depends on that business’s consumption pattern, not on a general rule about whether it’s a good idea.

Commercial Solar Cost by System Size

20kW System - What’s the Damage for a Small Business?

A 20kW system is typically suited to small businesses, professional offices, retail premises, and light commercial operations with moderate daytime electricity consumption. These systems generally require around 40 to 50 panels depending on the wattage used, and fit comfortably on a smaller commercial roof with good orientation.
Estimated cost after rebates: $18,000 – $28,000
Pricing varies depending on panel and inverter quality, electrical requirements at the site, and installation complexity.

30kW System - Pricing for Small Warehouses and Larger Offices

A 30kW system suits small warehouses, larger offices, medical centres, schools, and businesses with higher daytime energy demand than a standard small commercial premises. The system requires more roof space and more complex electrical work than a 20kW setup, which contributes to the higher cost.
Estimated cost after rebates: $26,000 – $38,000

50kW System - Mid-Scale Commercial Pricing

Medium warehouses, larger retail sites, commercial buildings with multiple tenants - these are the kinds of operations where a 50kW system tends to show up most often, usually because daytime electricity demand is high enough to make good use of what the system generates. These installations typically involve more complex mounting arrangements, larger inverter setups, and more involved grid connection requirements.
Estimated cost after rebates: $40,000 – $58,000
Roof space requirements at this scale are significant - a 50kW system generally needs several hundred square metres of usable roof area in suitable orientations.

100kW System - Large-Scale Commercial and Industrial Pricing

At 100kW and above, you’re looking at large warehouses, manufacturing facilities, logistics operations, and commercial properties with high and consistent daytime electricity demand. These systems involve detailed engineering, substantial electrical work, and often more complex grid connection approval processes through the network distributor.
Estimated cost after rebates: $75,000 – $110,000
Operations running this kind of system are usually doing so because their electricity bills are substantial and their daytime consumption is high enough to genuinely absorb what a 100kW system puts out. The bigger the bill, the harder the system works for you.

Are There Rebates or Incentives for Commercial Solar in Australia?

Yes - and they make a meaningful difference to the upfront cost. Small-scale Technology Certificates (STCs) Most eligible commercial rooftop solar systems qualify for STCs under the federal government’s Small-scale Renewable Energy Scheme. These certificates have a monetary value and are typically applied as a discount off the installation cost upfront - meaning the price you’re quoted already reflects the rebate rather than you having to claim it separately.
The value of STCs depends on the system size, the location of the installation, and when the system is installed. The scheme is scheduled to phase down gradually each year through to 2030, which means the rebate value available today is higher than it will be in future years. State-based Incentives Some Australian states offer additional incentives for businesses installing solar or battery storage. These vary by state and change over time - your installer should be across what’s currently available in your location. Tax Considerations Businesses may be able to claim depreciation on solar system assets under applicable tax provisions. This is worth a conversation with your accountant, as the specifics depend on your business structure and financial situation.
The key thing to understand is that rebate amounts aren’t fixed. Eligibility, certificate values, and state-level programs all vary, and any installer who quotes a specific rebate figure without checking current values and your eligibility should be questioned.

How Much Can a Business Save With Commercial Solar?

Moving from what the system costs to what it returns is where the real decision gets made. Savings depend on several things working together: Current Electricity Consumption The more electricity your business uses, the larger the bill the solar system is working against and the stronger the savings case. Daytime Energy Usage Businesses that use most of their electricity during daylight hours - when the panels are generating - get the most direct benefit. A business that runs flat out from 7 am to 5 pm and is empty at night is an ideal solar candidate. System Size and Generation A larger, well-designed system generates more electricity and offsets more of the bill. But the system needs to be sized to match actual consumption - generation that gets exported at a low feed-in rate delivers less value than generation used directly. Electricity Tariff Higher electricity tariffs mean more value per unit of solar electricity used. As grid prices continue to rise, the value of self-generated solar power increases alongside them. Export Rates Whatever your system generates that the business doesn’t use gets exported to the grid at a feed-in tariff rate. This contributes to savings but at a lower rate than the electricity you’d otherwise pay for. Battery Usage Where battery storage is included, it extends the window during which the business can draw on its own generated electricity rather than the grid - particularly useful for operations that run into the early evening.

Commercial Solar Panels vs Residential Solar - Why Does Pricing Differ?

Feature	Commercial	Residential
System Size	20kW – 100kW+	6.6kW – 13kW typical
Energy Demand	High business consumption	Household consumption
Roof Area	Large commercial roofs	Residential rooftops
Electrical Requirements	Often more complex	Generally simpler
Installation Complexity	Higher	Lower
Energy Assessment	Business-specific	Household-based
Approval Requirements	Network approval often more involved	Simpler grid connection

Commercial installations involve more equipment, more complex electrical work, and more involved compliance requirements than residential jobs - all of which contribute to higher costs. The financial return, however, scales with the size of the electricity bill being offset, which is why the business case for commercial solar is often compelling even at higher system costs.

How to Compare Commercial Solar Quotes

Price alone is a poor basis for comparing commercial solar quotes. Two quotes at different prices may include very different things - or the same things at different quality levels. Check What Is Included A complete commercial solar quote should cover panels, inverter, mounting system, electrical work, installation labour, monitoring system, grid connection costs, and warranty terms. Missing any of these from a quote doesn’t mean they’re free - it usually means they’ll appear later. Check the Expected Energy Generation The number of panels tells you less than the projected annual energy generation. A quote should include estimated output based on your location, roof orientation, and system design - not just a panel count. Check Warranty and After-Sales Support Panel performance warranties, inverter warranties, and workmanship warranties should all be documented. Equally important is knowing who to contact if something needs attention after installation - ongoing support matters for commercial systems that are running every day. Check Installer Accreditation and Experience CEC-accredited installers with genuine commercial experience bring a different level of competence to these projects than residential-focused installers who occasionally take on commercial work. Ask specifically about the installer’s experience with systems at the scale you’re considering.

Is Commercial Solar Worth the Investment for Australian Businesses?

For the right business in the right situation - yes, the financial case is strong. Commercial solar tends to make clear financial sense when:

• Electricity bills are significant and a major operating cost
• The business has suitable roof space in reasonable condition
• Daytime electricity consumption is high and consistent
• The system can be correctly sized to actual energy needs
• The projected return on investment suits the business’s financial position

It’s not automatically the right decision for every business. A business with very low electricity consumption, unsuitable roof conditions, or plans to relocate in the short term needs to look at the numbers carefully before committing.

Get a Commercial Solar Quote From Sunray Power

Sunray Power designs and installs Commercial Solar Panels Australia wide from small business systems through to large-scale commercial and industrial installations. Every project starts with a proper energy usage assessment and site inspection before any system is designed or priced.
The process covers energy assessment, site inspection, custom system design, equipment selection, professional installation by accredited installers, monitoring setup, and ongoing support after commissioning.
Get in touch for a free, no-obligation consultation and a system proposal built around your business’s actual energy requirements.

FAQs

How much does commercial solar cost in Australia?

Commercial solar system costs vary considerably depending on system size, equipment, roof conditions, and installation requirements. As a general guide, systems range from around $18,000 for a 20kW setup to $110,000 or more for a 100kW system - before and after applicable rebates.

How much does a 30kW commercial solar system cost?

A 30kW commercial solar system typically costs in the range of $26,000 to $38,000 after applicable rebates. The final figure depends on panel and inverter quality, site conditions, electrical requirements, and location.

How much does a 50kW commercial solar system cost?

Estimated costs for a 50kW commercial system generally fall between $40,000 and $58,000 after rebates. Roof space, electrical complexity, and equipment selection are the main variables that move that figure up or down.

Does commercial solar qualify for rebates in Australia?

Most eligible commercial rooftop solar systems qualify for Small-scale Technology Certificates under the federal government’s scheme, which reduces the upfront cost. The value depends on system size, location, and current certificate prices. State-based incentives may also apply depending on where the business is located.

How long does it take for commercial solar to pay for itself?

Payback periods for commercial solar in Australia typically range from 3 to 7 years depending on system size, electricity consumption, tariff rates, and how well the system is matched to the business’s daytime usage. After payback, the ongoing savings continue for the remainder of the system’s life.

What affects the cost of commercial solar installation?

The main factors are system size, panel and inverter quality, roof condition and available space, electrical work required at the site, grid connection requirements, and location. A proper site assessment is the only reliable way to produce an accurate cost estimate for a specific commercial property.