Considering commercial solar for your business?
Solar can be one of the most practical ways for Australian businesses to reduce electricity costs, particularly when a large proportion of energy is used during daylight hours.
But choosing a commercial solar system isn’t simply about installing as many panels as possible.
The right system should be designed around your electricity consumption, operating hours, roof space, electricity tariff, demand charges, export limits and future energy requirements.
A system that is too small may leave significant savings on the table.
A system that is too large may generate electricity your business cannot use economically.
This guide explains commercial solar costs in Australia, system sizing, business solar rebates, payback periods, batteries, export limits, installation considerations and how to compare commercial solar quotes.
Most importantly, it will help you understand whether commercial solar makes financial sense for your business before you request a quote.
Commercial Solar at a Glance
| Question | What businesses should know |
|---|---|
| Is commercial solar worth it? | Often, particularly for businesses with substantial daytime electricity consumption. |
| What size system do I need? | It should be based on your actual electricity consumption and solar generation potential—not simply roof size. |
| How much does commercial solar cost? | Costs vary significantly according to system size, equipment, roof, electrical work and project complexity. |
| Do businesses get solar rebates? | Eligible systems may receive federal incentives, but the applicable scheme depends on system size and eligibility. |
| Do I need batteries? | Not necessarily. Many businesses can achieve strong returns from solar alone. |
| What about electricity exports? | Network export limits can materially affect system design and financial returns. |
| How long is payback? | It varies by business, but high daytime consumption can significantly improve the economics. |
| Should I get multiple quotes? | Yes. Compare system design and financial assumptions—not just the headline price. |
What Is Commercial Solar?
Commercial solar is a photovoltaic (PV) system designed to generate electricity for a business, organisation or commercial property.
It can be used by:
- Offices
- Warehouses
- Factories
- Retail stores
- Shopping centres
- Restaurants
- Hotels
- Schools
- Medical centres
- Farms
- Workshops
- Gyms
- Clubs
- Strata properties
- Industrial facilities
The basic concept is straightforward:
Solar panels generate electricity → your business uses that electricity → surplus electricity may be exported to the grid.
The financial benefit comes primarily from reducing the amount of electricity your business needs to purchase from the grid.
The Most Important Commercial Solar Question
Before asking:
“How many solar panels can I fit on my roof?”
ask:
“How much electricity does my business use while the sun is shining?”
This distinction is extremely important.
Imagine a business consumes:
100,000 kWh per year
but most of its electricity usage occurs between:
8am and 5pm.
Solar generation happens during roughly the same period.
That’s potentially a very good match.
Now consider another business that uses most of its electricity:
6pm–midnight.
Solar alone may provide less direct value because the business isn’t operating when solar generation is highest.
That business may need to consider:
- Battery storage
- Load shifting
- Different operating schedules
- A smaller solar system
- Other energy-management strategies
Your load profile matters more than your roof size.
How Commercial Solar Reduces Your Electricity Bill
A commercial solar system can reduce your electricity costs in two main ways.
1. Solar self-consumption
Your business uses electricity generated by the panels.
This avoids purchasing the equivalent electricity from the grid.
2. Electricity export
If your solar system produces more electricity than your business is using, surplus electricity may be exported to the grid.
You may receive a feed-in payment, depending on your electricity contract and network arrangements.
However:
Exporting solar is usually not the same financially as using solar yourself.
For many businesses, the greatest value comes from using solar directly on site.
Why Self-Consumption Is So Important
Suppose your business generates:
50 kWh of surplus solar
during the day.
You have two possibilities.
Scenario A — Use it yourself
The electricity offsets electricity you would otherwise purchase from the grid.
Scenario B — Export it
You receive an export payment according to your electricity arrangement.
The value of those two outcomes can be very different.
This is why a commercial solar system should be designed around self-consumption, rather than simply maximising panel capacity.
Commercial Solar System Sizes
There is no universal “correct” commercial solar size.
However, businesses commonly consider systems ranging from tens of kilowatts to hundreds of kilowatts or more.
| System size | Potential application |
|---|---|
| 10–30kW | Small offices, retail, professional businesses |
| 30–100kW | Larger retail, schools, clubs, workshops |
| 100–250kW | Warehouses, larger commercial buildings |
| 250kW–1MW+ | Factories, large warehouses, industrial facilities |
These are broad categories rather than strict classifications.
The correct system size depends on your site’s:
- Electricity consumption
- Daytime load
- Roof area
- Roof orientation
- Shading
- Network connection
- Export limit
- Future energy demand
How to Work Out What Size Commercial Solar System You Need
Your installer should ideally analyse your electricity data rather than make a recommendation based only on your quarterly bill.
Ask for an assessment using:
Electricity consumption
How many kWh does your business consume?
Half-hourly or interval data
When does your business actually use electricity?
Maximum demand
What are your highest periods of electricity demand?
Solar generation
How much energy could your proposed system generate?
Export constraints
How much electricity can your site export?
Future energy requirements
Are you planning:
- EV charging?
- Additional refrigeration?
- Air-conditioning expansion?
- New machinery?
- Extended operating hours?
- Battery storage?
Commercial Solar Cost Australia 2026
Commercial solar pricing varies significantly.
A small rooftop installation can have a very different cost per kW from a large industrial project.
Factors affecting the final price include:
- System size
- Solar panel brand
- Inverter technology
- Roof type
- Roof condition
- Structural requirements
- Switchboard upgrades
- Electrical infrastructure
- Cable distances
- Grid connection requirements
- Monitoring
- Access
- Installation complexity
- Engineering
- Safety requirements
Indicative project ranges
Rather than treating these as fixed market prices, use them as a starting point for budgeting:
| System | Indicative installed cost |
|---|---|
| 20kW | ~$20,000–$30,000+ |
| 50kW | ~$45,000–$70,000+ |
| 100kW | ~$80,000–$130,000+ |
| 250kW | ~$180,000–$300,000+ |
| 500kW | ~$350,000–$600,000+ |
Actual commercial solar pricing can vary substantially.
For larger projects, economies of scale can reduce the cost per installed kW, while difficult sites can increase it.
Don’t choose the cheapest quote automatically.
A $100,000 system producing more useful electricity may be a better investment than an $80,000 system with poor design or lower-quality equipment.
What Does a 100kW Commercial Solar System Cost?
A 100kW system is a useful example because it is large enough to require more detailed planning than a typical small commercial installation.
The final cost can depend on:
- Number and type of panels
- Inverter configuration
- Roof structure
- Switchboard capacity
- Cable runs
- Network requirements
- Engineering
- Monitoring
- Installation access
- Export restrictions
A quote of $90,000 and a quote of $120,000 cannot be compared properly without examining what each includes.
Commercial Solar Payback Period
Payback is one of the first numbers business owners usually ask about.
The basic calculation is:
Total project cost ÷ annual financial benefit = simple payback
For example:
$100,000 investment
and
$20,000 annual energy savings
would produce a simple payback of approximately:
5 years
But real commercial solar analysis should go beyond this simple calculation.
A proper financial model should consider:
- Solar degradation
- Electricity price changes
- Export revenue
- Maintenance
- Financing costs
- Incentives
- Tax treatment
- System performance
- Business operating hours
- Future electricity consumption
Don’t accept a payback number without asking:
“What assumptions were used to calculate this?”
What Makes Commercial Solar Payback Faster?
Several factors can improve project economics.
High daytime electricity consumption
The more solar you use directly, the greater the potential value.
High electricity costs
Solar can offset expensive grid purchases.
Good roof conditions
A simple, unobstructed roof can reduce installation costs.
Strong solar resource
More generation can improve project returns.
Appropriate system sizing
Avoiding excessive exports can improve the economics.
Available incentives
Eligible incentives can reduce upfront costs.
The Commercial Solar Trap: Oversizing the System
A common misconception is:
“The bigger the solar system, the more money we save.”
Not necessarily.
Suppose your business consumes:
200kWh during the day
but a proposed system frequently generates:
350kWh
The additional generation may need to be exported.
If your export payment is substantially lower than the value of electricity you avoid purchasing, the extra panels may deliver a lower return.
Bigger isn’t automatically better.
The objective should be:
Maximum useful energy at an acceptable investment cost.
Solar Export Limits: Why They Matter
This is one of the most important commercial solar considerations.
Your electricity network may restrict how much solar your business can export.
For example, your system might technically be capable of producing hundreds of kilowatts, but your network connection may limit export capacity.
This can result in:
Solar generation → Business
while excess generation is:
Curtailed / limited
rather than exported.
Before signing a contract, ask:
“What is my site’s approved export capacity?”
This can materially affect the financial model.
Commercial Solar and Demand Charges
Some businesses don’t simply pay for the amount of electricity they consume.
Their electricity bills may also include demand-related charges.
This means your highest periods of electricity demand can influence your electricity costs.
Solar can sometimes help reduce demand during certain periods, but the impact depends on:
- Tariff structure
- Demand measurement method
- Time of demand
- Solar generation at that time
- Network rules
Important:
Don’t assume:
“Solar reduces my demand charges.”
Ask your energy consultant or retailer to model your specific tariff.
Do Commercial Businesses Need Solar Batteries?
Not necessarily.
A battery can be valuable, but solar-only systems can make excellent financial sense for businesses with strong daytime energy consumption.
A battery becomes more interesting when your business:
- Uses substantial electricity after sunset
- Has significant solar exports
- Experiences high electricity prices at certain times
- Needs backup power
- Wants greater energy flexibility
- Can benefit from load management
Commercial Solar + Battery Example
Imagine a warehouse uses most of its electricity:
8am–6pm
Solar alone may already cover a large portion of its consumption.
A battery might provide limited additional financial benefit.
Now consider a business that operates:
24 hours a day
The battery may allow some daytime solar generation to be shifted into evening and overnight operations.
The right question isn’t:
“Should my business get a battery?”
It’s:
“What additional financial benefit would a battery provide compared with solar alone?”
Ask your installer to model both options.
Commercial Solar Rebates and Incentives
Australian businesses may be eligible for different incentives depending on the size and eligibility of the system.
These can include:
Small-scale Technology Certificates
Eligible smaller systems can potentially receive STCs.
Large-scale Generation Certificates
Larger eligible systems may participate in the LGC framework.
State and territory programs
Additional incentives may be available depending on location and program rules.
Tax treatment
Commercial solar is generally a business asset, so depreciation and other tax considerations can affect the investment case.
Tax treatment depends on your business circumstances. Speak with your accountant before relying on a tax benefit in your project model.
STCs vs LGCs: What’s the Difference?
This is an important distinction.
STCs
STCs generally provide an upfront financial benefit for eligible small-scale renewable energy systems.
LGCs
LGCs are associated with eligible larger renewable energy generation and are generally created based on electricity generated.
The relevant threshold and eligibility requirements matter.
Don’t assume:
“My system is over 100kW, so I automatically receive LGCs.”
Your project needs to meet the applicable requirements.
Commercial Solar Tax Benefits
Solar can also have tax implications for a business.
Depending on your circumstances, a solar system may be treated as a depreciating business asset.
Potential tax benefits can affect the overall economics of the project.
However, tax rules and business circumstances vary.
Always separate:
Solar energy savings
from
Government incentives
from
Tax benefits
when evaluating the project.
That gives you a clearer understanding of the underlying return.
Commercial Solar ROI: Look Beyond the Payback Period
Two projects can have the same payback period but very different long-term economics.
For example:
Project A
Cost: $100,000
Annual savings: $20,000
Project B
Cost: $150,000
Annual savings: $30,000
Both have a simple:
5-year payback.
But other factors could make one more attractive:
- System lifespan
- Maintenance
- Performance
- Financing
- Roof replacement requirements
- Warranty
- Future energy prices
- Business plans
Ask for:
10-year and 20-year cash-flow projections
rather than only a payback figure.
What If Your Business Is Leasing Its Premises?
This is an important consideration.
If you’re a tenant, ask:
- Who owns the solar system?
- Who pays for installation?
- What happens when the lease ends?
- Can the system remain on the building?
- Who receives the energy savings?
- Is landlord approval required?
- What happens if the business relocates?
A solar system can have a long operating life, so your lease term should be considered before installation.
What If Your Roof Needs Replacing?
This is another frequently overlooked issue.
Installing solar on a roof that needs replacement soon can create an expensive problem.
You could eventually have to:
Remove panels → replace roof → reinstall panels
Before installing commercial solar, consider the remaining life of the roof.
Ask for a roof assessment if necessary.
The cheapest time to resolve structural problems is before the solar installation.
Commercial Solar Installation: What Should Be Checked?
A professional commercial project may require assessment of:
Roof
- Condition
- Structural capacity
- Access
- Waterproofing
- Remaining lifespan
Electrical infrastructure
- Main switchboard
- Cabling
- Transformer
- Protection equipment
- Existing generation
Network
- Connection requirements
- Export capacity
- Protection requirements
Solar design
- Orientation
- Tilt
- Shading
- Panel layout
- Inverter configuration
How Many Solar Panels Does a Commercial System Need?
This depends on the wattage of the panels.
For example, using 500W panels:
50kW system
Approximately:
100 panels
100kW system
Approximately:
200 panels
250kW system
Approximately:
500 panels
These are simplified calculations.
Actual system capacity depends on equipment selection, DC/AC design and applicable electrical requirements.
How Much Roof Space Does Commercial Solar Need?
Panel size varies, but a useful planning estimate is that a commercial rooftop system may require roughly 5–7 square metres per kW of installed capacity, depending on panel dimensions, layout, access paths and roof constraints.
That means a:
100kW system
could require approximately:
500–700m²+
of usable roof area.
The actual requirement can be higher because you may need:
- Walkways
- Fire access
- Setbacks
- Maintenance areas
- Equipment clearances
What Equipment Does a Commercial Solar System Need?
A typical system includes:
Solar panels
Generate DC electricity.
Inverters
Convert DC electricity into usable AC electricity.
Mounting system
Secures panels to the roof or ground structure.
Electrical protection
Protects equipment and people.
Monitoring
Allows the business to track system performance.
Switchgear and cabling
Connect the solar system to the building’s electrical infrastructure.
Optional battery
Stores energy for later use.
What Solar Panel and Inverter Should a Business Choose?
Don’t select equipment based solely on efficiency.
Consider:
- Manufacturer reputation
- Warranty
- Product availability
- Australian support
- Temperature performance
- Monitoring
- Replacement availability
- Installer experience
- Long-term serviceability
A slightly cheaper component isn’t necessarily cheaper over 20 years.
Commercial solar should be treated as an infrastructure investment.
How to Compare Commercial Solar Quotes
This is one of the most valuable sections for a business owner.
Don’t compare:
$100,000 vs $120,000 vs $140,000
without examining the systems.
Instead compare:
| Important factor | Quote A | Quote B | Quote C |
|---|---|---|---|
| System size | |||
| Panel brand/model | |||
| Panel efficiency | |||
| Inverter | |||
| Annual generation | |||
| Self-consumption | |||
| Export assumptions | |||
| Export limit | |||
| System cost | |||
| Incentives | |||
| Final cost | |||
| Annual savings | |||
| Payback | |||
| Warranty | |||
| Monitoring | |||
| Maintenance | |||
| Roof works included |
The most important comparison may be:
Estimated annual savings per dollar invested.
Not simply:
Lowest project price.
15 Questions to Ask a Commercial Solar Installer
Before accepting a quote, ask:
- How much electricity do you expect the system to generate annually?
- What percentage will we consume directly?
- How much electricity will be exported?
- What export limit has been assumed?
- What electricity tariff did you use for the savings calculation?
- Have demand charges been included?
- What incentives are included in the quoted price?
- What happens if the network restricts export?
- How long is the panel warranty?
- How long is the inverter warranty?
- What happens if an inverter fails?
- Is monitoring included?
- Is roof repair or structural work included?
- What maintenance will the system require?
- Can you provide a 10–20 year financial model?
If the answers aren’t clear, don’t rush into the contract.
Commercial Solar Mistakes That Can Cost Businesses Money
1. Choosing the cheapest quote
Lowest price doesn’t necessarily mean lowest cost over the system’s lifetime.
2. Oversizing the system
Too much generation can increase exports and reduce the value of additional panels.
3. Ignoring the roof
A poor roof can create expensive future costs.
4. Ignoring export limits
A system that cannot export as much as assumed may produce a different financial return.
5. Using unrealistic electricity prices
Future savings shouldn’t be based on extreme assumptions.
6. Ignoring demand charges
For some businesses, demand charges are significant.
7. Buying a battery without modelling it
Storage should have a financial or operational reason.
8. Not considering future energy demand
EV charging, refrigeration, machinery and business expansion can change your energy profile.
Is Commercial Solar Worth It for Your Business?
Commercial solar is particularly worth investigating if your business:
- ✅ Uses substantial electricity during daylight hours
- ✅ Has a suitable roof or land area
- ✅ Has relatively high electricity costs
- ✅ Can consume a large percentage of solar generation
- ✅ Has a long-term lease or owns the property
- ✅ Has predictable daytime operations
- ✅ Wants to reduce exposure to electricity price increases
It may require more careful analysis if:
- ⚠️ Your business operates mainly at night
- ⚠️ Your roof needs replacement
- ⚠️ Your electricity consumption is low
- ⚠️ Export restrictions are significant
- ⚠️ You plan to move premises soon
- ⚠️ The proposed system relies heavily on export revenue
Commercial Solar + EV Charging
Businesses planning electric vehicle charging should consider solar and EV infrastructure together.
For example:
Solar panels → Business loads → EV charging
can create additional daytime consumption.
This can increase the amount of solar electricity consumed directly on-site.
Businesses with:
- Delivery fleets
- Company vehicles
- Employee charging
- Commercial EV fleets
may therefore want to model solar + EV charging together rather than installing each independently.
The Future of Commercial Energy: Solar + Battery + EV
For some businesses, the long-term opportunity isn’t simply:
Solar panels
but:
Solar + battery + EV charging + energy management
This can allow businesses to manage when electricity is:
- Generated
- Consumed
- Stored
- Exported
- Used for vehicle charging
The right combination depends heavily on the business’s operating profile.
Commercial Solar Checklist
Before approving a project, make sure you understand:
☐ Current annual electricity consumption
☐ Daytime electricity consumption
☐ Electricity tariff
☐ Demand charges
☐ Solar system size
☐ Estimated annual generation
☐ Expected self-consumption
☐ Export limit
☐ Expected grid exports
☐ Solar panel model
☐ Inverter model
☐ Roof condition
☐ Structural requirements
☐ Incentives
☐ Final installed cost
☐ Annual savings
☐ Payback
☐ Long-term cash flow
☐ Warranty
☐ Monitoring
☐ Maintenance
☐ Future expansion options
Final Verdict: Is Commercial Solar a Good Investment?
For many Australian businesses, commercial solar can be a powerful way to reduce operating expenses and improve long-term energy economics.
But the best system isn’t necessarily:
the largest system,
the cheapest system,
or
the system with the most panels.
The best system is one that is properly matched to your business’s electricity consumption, operating hours, roof, tariff and future energy requirements.
The most important numbers to understand are:
1. How much will the system cost?
2. How much electricity will it generate?
3. How much will my business consume directly?
4. How much will be exported?
5. How much will I save each year?
6. What incentives apply?
7. What is my realistic payback and long-term return?
Once you know these numbers, comparing commercial solar becomes much easier.
Get 3 Commercial Solar Quotes
Don’t compare commercial solar on price alone.
Get multiple proposals and compare the things that actually affect your business’s return:
✓ System size
✓ Annual generation
✓ Self-consumption
✓ Export assumptions
✓ Panel & inverter brands
✓ Installation requirements
✓ Incentives
✓ Annual savings
✓ Payback period
✓ Warranty & support
👉 Get 3 Free Commercial Solar Quotes
Tell us about your business, electricity usage and property, and compare options from installers who can design a system around your actual energy requirements.
No obligation. Compare before you commit.
