Solar for a home and solar for a business use the same basic technology, but the design, approvals and paperwork can look very different. If you are weighing up a residential system for your house or a commercial system for your premises, this guide explains where they overlap and where they do not, so you can ask the right questions from the start.
The short version
- Both use panels, an inverter and a grid connection, but commercial systems are usually larger, often three-phase, and designed around daytime business hours.
- Systems of up to 100 kW, home or business, fall under the small-scale certificate (STC) scheme, but larger systems are treated differently.
- Commercial projects usually involve more checks: roof structure, network studies, access, safety and approvals.
- The best system is the one designed around when and how you use power, not just the size of your roof.
How Residential Solar Works
A typical home system sits on the roof and supplies the household first. Panels generate during the day, and any surplus is exported to the grid for a feed-in credit from your retailer. Many homes use more power in the morning and evening than at midday, which is why batteries are popular: they store midday surplus for later. Systems are usually sized to fit the roof, the household’s use and the network’s limits. See our residential solar page and our guide to home battery storage.
How Commercial Solar Works
A business typically uses power during working hours, which lines up well with solar production. That means a larger share of what the panels generate can be used on site rather than exported. Commercial systems also tend to be bigger, often three-phase, and may include more monitoring detail so the business can see how much of its use is covered. Sizes range widely: our commercial system sizes page shows typical configurations from 5 kW up to 100 kW, and our commercial solar page covers the service.
Key Differences at a Glance
Size and supply
Homes commonly have single-phase or three-phase supply and systems of a few kilowatts to around 10 kW. Businesses often have three-phase supply and systems that can run from tens of kilowatts upwards. The supply type affects which inverter and layout are suitable.
When the power is used
A business that operates from 7am to 5pm may use most of its solar directly. A household that is empty during the day exports more. This difference drives the design, including whether a battery is worth considering.
Roof and structure
Commercial roofs can be large and flat, or use materials such as metal sheeting or concrete that need specific fixings. Larger arrays add weight and wind load, so the roof structure and condition are checked before design is finalised. Access, edge protection and working at height are planned carefully.
Approvals and network rules
Residential systems usually follow a standard approval path with the network operator. Larger commercial systems can require more detailed network studies, protection settings and limits on how much power can be exported. Planning for those early avoids delays. Our installation process guide describes the general sequence.
Certificates and rebates
Under the federal Small-scale Renewable Energy Scheme, eligible systems of up to 100 kW create Small-scale Technology Certificates that are applied as an upfront discount. Systems above that size are treated differently under the Renewable Energy Target. State programs mostly target households, so businesses should not assume a residential program applies to them. Because rules and eligibility change, always ask for what applies to your property in writing.
Warranties and maintenance
Both need product and workmanship warranties, but commercial owners often put more weight on monitoring, cleaning plans and response times, because downtime affects business operations. Ask what the maintenance and fault-response arrangements are.
Things Businesses Should Check
- Do you own the building, or do you need your landlord’s consent?
- Is the roof structure and condition suitable for the planned array, and how long is its remaining life?
- What is your daytime usage pattern, and would a battery or export limit change the design?
- Who handles the network application, and how will work be scheduled around your operations?
- Which accounting or tax treatment applies? Speak with your accountant, as this depends on your business structure.
Things Households Should Check
- Is your roof suitable in direction, shading and condition?
- Do you want battery-ready design now or later? See our guide to hybrid solar inverters.
- Which state rebates apply to your property? We have guides for Tasmania, Victoria and Western Australia.
- Are you comparing quotes on equipment and inclusions? Our quote comparison guide helps.
Which One Is Right for You?
If you are choosing a system for a house, the starting point is usually your household usage pattern and whether a battery fits your goals. If you are choosing for a business, the starting point is your daytime load, your roof and your network limits. If you own both a home and business premises, each deserves its own assessment, because the right design is rarely identical.
Sunflare Solar installs residential and commercial systems across Victoria, Tasmania, New South Wales and Western Australia. We start with a free assessment, explain the options plainly, and handle the approvals and paperwork.
Frequently Asked Questions
Can the same installer do both residential and commercial solar?
Yes, but ask about their experience with the size of system you need, because larger commercial systems involve extra design, approval and safety requirements.
Do commercial solar systems qualify for the federal discount?
Eligible systems of up to 100 kW can create Small-scale Technology Certificates, which are applied as an upfront discount. Larger systems are treated differently, so confirm what applies to your project.
Do state residential rebates apply to businesses?
Generally not. Most state programs are designed for households, so businesses should check eligibility for any program they are considering.
Is a battery more useful for a home or a business?
It depends on usage. Homes with mostly evening demand often benefit more. Businesses that use power during the day may use most of their solar directly.
What size commercial system do I need?
That depends on your daytime usage, roof area and network limits. Our commercial system sizes page shows typical configurations from 5 kW to 100 kW.
Can Sunflare Solar assess both?
Yes. We start with a free assessment for homes and businesses and explain which option suits your property.
Ready for a clear answer for your property? Book a free assessment with Sunflare Solar or call 1300 385 880. We install across Victoria, Tasmania, New South Wales and Western Australia. See the areas we serve.
