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Commercial Solar System Sizes
Understand common kW system sizes and find the right fit for your business. From 20kW entry-level systems for small offices to 1MW+ industrial installations.
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From Local Businesses to National Brands. Across IT, Print, LED, AV and Commercial Solar solutions Australia-wide.
Commercial Solar Designed Around Your Business
Commercial solar designed, installed and supported Australia-wide.
Whether you’re looking to reduce electricity costs, improve energy efficiency or take greater control of your business electricity bill, the right commercial solar system starts with understanding how your site actually uses power.
At Sharp EIT Solutions, every commercial solar power system is designed around your site, energy usage, operating hours and long-term business goals. We also factor in available government incentives so you can understand your real net cost upfront.
Our Green Energy division is led by Neil Armstrong, General Manager of Green Energy, who brings practical commercial solar experience to every stage of the process — from system design and financial modelling through to installation and long-term performance support.
You get clear advice, honest numbers and a team that remains accountable well after your commercial solar installation is complete.
Solar System Sizes
#Find the Right Commercial Solar System Size
Below is a simple guide to common commercial solar system size ranges. Your best fit depends on your roof space, operating hours and how much of the solar power your business can use onsite.
20kW – 30kW Commercial Solar Systems
Small Offices & Entry-Level Commercial
30kW – 75kW Commercial Solar Systems
Small to Medium Businesses
100kW - 250kW Commercial Solar Systems
Growing Businesses & Manufacturing
250kW – 500kW Commercial Solar Systems
High-Load Commercial & Industrial
500kW – 1MW Commercial Solar Systems
Industrial-Scale & Enterprise Projects
1MW+ Commercial Solar Solutions
Engineered for Enterprise & Infrastructure Projects
#🎥 Hear From One of Our Clients
"Sharp EIT made the switch to solar effortless. The install was fast, the team was great to deal with". Joe Kelly, CEO of North Ryde RSL.
#Commercial Solar Rebates & Incentives for Businesses
Taking advantage of commercial solar incentives can reduce your upfront investment by 30-50%. Depending on your system size and business location, you may qualify for:
Small-Scale Technology Certificates (STCs): Available for commercial solar systems under 100kW. STCs provide an upfront discount based on expected generation. Typical rebate: $400-$600 per kW installed. A 20kW system typically receives approximately $8,000-$12,000 in STC rebates upfront. A 30kW system receives approximately $12,000-$18,000. A 100kW system receives approximately $40,000-$45,000.
Large-Scale Generation Certificates (LGCs): For 100kW solar systems and larger, LGCs provide ongoing annual credits based on actual energy generation rather than upfront discounts.
Instant Asset Write-Off: Australian businesses can immediately deduct the full cost of commercial solar installations up to $150,000. This applies to 20kW, 30kW, 100kW, and larger systems. We handle all incentive applications and paperwork as part of your installation.
#Need Help Choosing a Solar System Size?
Get expert advice on selecting the right commercial solar system for your energy usage, business type, and infrastructure — from 20kW systems to multi-megawatt installations.
#FAQs About Commercial Solar System Sizes
The right size depends on how much electricity you use and when you use it. Small offices often need 20kW, retail typically needs 30kW-50kW, medium operations need 100kW, and large facilities need 250kW+. A commercial solar system is usually sized to maximise daytime self-consumption and avoid over-exporting, which can reduce returns.
Yes. A 20kW commercial solar system generates approximately 28,000 kWh annually, enough to power most small offices, cafes, or retail shops with 1-5 staff. If your power bill is $800-$1,500 per month, 20kW is likely ideal.
It comes down to your daytime baseload, operating hours, roof space, and tariff. 20kW systems suit small operations with limited roof space, while 30kW systems suit standard small businesses. 100kW+ is for growing businesses with higher energy demand.
A 20kW solar system can generate around 28,000kWh per year, a 30kW system around 42,000kWh, while a 100kW system can produce about 140,000kWh annually.
Typically, a 20kW commercial solar system costs $15,000-$25,000 after STC rebates, while a 30kW system costs $25,000-$35,000. The per-watt cost usually decreases as system size increases.
Not always. If your system is too large for your onsite usage, you may export more solar to the grid, which can lower the overall value depending on feed-in rates, tariffs and network rules.
Your load profile, demand peaks, energy tariffs, switchboard capacity, shading, roof structure, export limits, and network approvals can all influence the best commercial solar system size.
Yes. Many businesses stage a commercial solar installation to align with budgets, growth plans, site works or approval requirements. Staging can also help confirm performance before expanding capacity.
Often, yes. Depending on size and location, commercial systems may require network approval, export limits confirmation, metering changes and engineering checks, particularly on larger installations.
Not necessarily, but battery storage can help if your business uses more power after hours, exports a lot of solar, or wants added resilience. In some cases, batteries improve self-consumption and strengthen the business case.