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Commercial Solar System Costs
Guide for Businesses
Understand commercial solar panel costs, system pricing per kW, and what drives installation prices. Typical commercial solar costs range from $900-$1,200 per kW installed (before STC rebates). Actual pricing varies based on site conditions and equipment selection.
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What do commercial solar panels cost?
Commercial solar system costs are typically quoted as an installed system price, not just the panels. That price includes panels, inverters, mounting systems, labour, safety requirements, testing and grid connection.
Current commercial solar pricing in Australia:
- Small systems (20kW-30kW): $900-$1,200 per kW ($18,000-$36,000 total)
- Medium systems (50kW-100kW): $750-$950 per kW ($37,500-$95,000 total)
- Large systems (250kW+): $650-$850 per kW ($162,500-$212,500 total)
After STC rebates (systems under 100kW), your net cost drops by $400-$600 per kW.
Pricing is indicative only based on standard site conditions. Costs vary by roof type, access, electrical requirements, and current STC market rates.
#What Affects Commercial Solar System Cost?
Not every factor applies to every site. These are the main variables influencing commercial solar pricing. Costs listed are typical ranges only, actual prices depend on site-specific requirements discovered during inspection.
System size (kW)
Larger systems cost more overall but reduce cost per kW due to economies of scale. A 20kW system costs ~$1,000/kW while a 100kW system costs ~$800/kW. The right size depends on your demand and available space.
Operating hours & load profile
How your site uses electricity affects how much solar is used on-site. Usage that overlaps with generation improves value and shortens payback. We model your load profile to optimise system sizing.
Roof type & site conditions
Roof type, access, shading and condition affect installation complexity. Tilted roofs cost less than flat roofs requiring tilt frames. Ground-mount costs more due to civil works.
Electrical & switchboard upgrades
Some sites need switchboard upgrades, metering changes, or grid connection work. These add $2,000-$15,000 depending on complexity and DNSP requirements. We assess this during site inspection.
Grid connection & approvals
Network requirements, export limits and approvals vary by location. These affect both price and delivery timeframes. We manage all approvals as part of our service.
Engineering, design & monitoring
Engineering requirements and commissioning affect cost. Monitoring supports performance tracking and issue detection. Proper design ensures long-term system reliability.
Quality, warranties and ongoing support
Equipment quality and warranty coverage affect price. Higher-quality components increase upfront cost but reduce long-term risk. We offer tiered options to match your budget and risk profile.
Battery Storage (Optional)
Battery storage adds $800-$1,200 per kWh. A 100kW system with 100kWh battery adds $80,000-$120,000. Storage suits sites wanting to increase self-use or manage peak demand charges.
Commercial Solar Payback Period & ROI
Most businesses achieve payback in 2.5 to 4 years, depending on electricity rates, system size, and how much solar is used on-site (self-consumption).
Stronger payback occurs when:
- Your business uses 70-80% of generated solar power (not exporting to grid)
- System size matches your daytime demand profile
- You offset steady baseloads (HVAC, refrigeration, equipment)
- Roof condition and switchboard don't require major upgrades
Example ROI: A 100kW system costing $75,000 (after STC rebate) generating 140,000 kWh annually at $0.22/kWh saves $30,800 per year. Payback: 2.4 years. Over 10 years: $230,000+ in savings. (Savings and payback periods vary based on electricity rates, consumption patterns, system performance, and site-specific factors. We provide detailed ROI projections based on your actual energy bills during our assessment.)
Finance or Capex
#Funding Types for Commercial Solar Systems
Finance subject to credit approval and lender criteria. Terms and availability vary.
Finance
- Preserves capital for operations or growth
- Spreads cost over time with predictable payments
- Often suited to staged installs or multi-site rollouts
- Can also support a storage add-on later if required
Capex (pay upfront)
- Own the system from day one
- Typically maximises lifetime return once payback is achieved
- Straightforward for single-site installs where capital is available
#Need a Detailed Cost Estimate for Your Site?
Every business is different — and so is every solar solution. Request your no-obligation pricing estimate today and discover how much your business could save.
#Your Questions About Commercial Solar Costs
Commercial solar systems cost $900-$1,200 per kW for small systems (20-30kW), $750-$950 per kW for medium systems (50-100kW), and $650-$850 per kW for large systems (250kW+). After STC rebates, net costs are $400-$600 per kW lower. A typical 100kW commercial solar system costs $65,000-$85,000 installed, or $55,000-$75,000 after rebates.
Actual costs vary by site conditions, equipment selection, roof type, and current STC rates. Contact us for a detailed assessment based on your specific requirements.
For a full overview of options, visit our Commercial Solar Solutions page.
Commercial solar panels cost $900-$1,200 per kW installed for small businesses (20-30kW systems) and $650-$850 per kW for large industrial installations (250kW+). This includes panels, inverters, mounting, labour, and grid connection. STC rebates reduce these costs by $400-$600 per kW for systems under 100kW.
Prices are indicative only and vary based on site access, roof condition, and equipment specifications.
Learn more about commercial solar system sizes.
Commercial solar installation costs represent 15-25% of total system price. For a 100kW system costing $75,000, installation is approximately $11,000-$19,000. Complex sites with electrical upgrades or difficult roof access cost more. Standard rooftop installations on good condition roofs cost less. Complex sites with electrical upgrades, difficult roof access, or requiring specialised equipment may cost more. Standard rooftop installations on good condition roofs typically cost less. We provide detailed site-specific quotes after inspection.
See how commercial solar works across different industries on Commercial Solar Solutions.
Commercial solar payback periods range from 2.5 to 4 years for most Australian businesses. A 100kW system costing $75,000 that saves $30,000 annually in electricity costs pays back in 2.5 years. Businesses with high daytime energy usage and high electricity rates achieve the fastest payback.
For ROI drivers and payback factors, explore commercial solar system costs or request a feasibility assessment.
STC rebates reduce commercial solar system costs by approximately $400-$600 per kW. A 20kW system receives $8,000-$12,000 in rebates. A 30kW system receives $12,000-$18,000. A 100kW system receives $40,000-$45,000 in upfront STC discounts. Systems over 100kW receive LGCs (ongoing annual credits) instead.
Both options are available. Many businesses choose $0 upfront finance to match repayments to energy savings and preserve capital. Others prefer Capex to maximise long-term return and own the asset immediately. Finance suits car park canopies and staged installs. Capex suits straightforward rooftop installations under 100kW.
Compare options on our Solar Finance Options for Australian Businesses page.
Yes. Battery storage adds $800-$1,200 per kWh. A typical 100kW system with 100kWh battery adds $80,000-$120,000 before incentives. Storage suits sites wanting to increase self-use of solar, improve resilience, or manage peak demand charges. Some businesses include storage upfront; others add it later once usage is clear.
The main cost drivers are: site conditions (roof type, shading, access), electrical upgrades (switchboard, metering, grid connection), system size (larger systems cost more total but less per kW), and equipment quality (premium panels cost 10-20% more). Ground-mount systems and car park canopies also cost more than standard rooftop installations due to structural requirements.
Learn more about our approach on Commercial Solar Solutions.