What solar system size is best for my business?

February 12, 2025

Solar system size guide

Use the table below to get an idea of the size of a system that will be suitable for your business.

System Size (kWp)	Small Business	Medium Business	Large Business	Extra Large Business	Energy Generated per year (kWhr) Approx.	Savings in your Electricity bill* per year
10	/				1,400	$3,500
15	/	/			21,350	$5,300
20		/			28,400	$7,000
30		/	/		42,700	$10,600
50-80			/	/	70,000-114,000	$17,500-$28,500
100			/	/	140,000	$35,000

* Based on average electricity cost of $0.25 cents / kWHr, 5.1hr sun per day. Note: Based on 100% solar consumption.

To determine what solar system size is best for your business, one of our CEC Accredited Assessors will firstly determine:
your base electricity loading during sunlight hours
your roof size and type
your payback period & return on investment
Once our assessment is complete we will provide you with a no obligation comprehensive proposal.

View our commercial solar packages

FAQs on solar system sizing for businesses

Your questions about solar system sizes for businesses answered.

What factors should I consider when determining the ideal solar system size for my business?

Consider electricity consumption, available roof or land space, sunlight exposure, and budget constraints.

How do I calculate my business’s energy needs?

Review your utility bills to determine your average monthly kWh usage, then consider future energy demands based on business expansion or increased equipment usage. MPV Solar can help you with this process.

What is the difference between grid-tied and off-grid solar systems?

Grid-tied systems connect to the utility grid and often rely on it for backup, while off-grid systems are self-sufficient and require battery storage for energy.

Is there a minimum size for a solar system to be beneficial for my business?

While there’s no strict minimum size, a system that covers a significant portion of your electricity needs will generally provide better financial returns.

Can a smaller solar system still offer savings for my business?

Yes, even a smaller system can reduce your electricity bills, depending on your consumption and local energy costs.

How do incentives and rebates affect my decision on solar system size?

Rebates can offset initial costs, making larger systems more financially viable. Research government and council rebates before deciding.

What is the capacity of a typical commercial solar system?

Commercial solar systems can range from a few kilowatts (kW) to several megawatts (MW), depending on the business’s energy requirements and property size. View our commercial solar packages

How does the orientation and tilt of my roof affect solar system sizing?

Optimal orientation and tilt maximise sunlight exposure, potentially reducing the required system size for the same energy output.

What role do future energy needs play in sizing a solar system?

Anticipating growth or increased electricity usage ensures that your solar system can accommodate future demands without needing an upgrade.

Should I consult a professional for sizing my solar system?

Yes, consulting with a solar energy professional is highly recommended for optimal results. MPV Solar are your local trusted solar experts who can provide tailored insights based on your specific business needs and financial goals, ensuring you get the right system size to maximise your energy savings and efficiency. Join the solar revolution today and get a FREE Quote.

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MPV Solar is committed to providing industry-leading solar energy solutions across Sydney, backed by a proven track record of successfully completing over 5,000 projects. As a family-owned business, we prioritise personalised service and truly value our clients, ensuring that each system is tailored to meet your unique energy needs.