Determining the appropriate size for a solar system is a crucial step for individuals and businesses considering the adoption of solar energy. By understanding their energy needs and the most common solar system sizes available, one can make an informed decision that aligns with their goals and requirements. Factors such as energy consumption, available roof space, geographical location, and financial considerations all play a significant role in determining the ideal size of a solar system.

In this blog, we will explore the factors that influence what size solar system you may need and delve into the most common solar system sizes found in residential and business installations, and how to best choose your system. 

What is the Average Power Usage Per Person, Per Household?

Knowing the average usage per person gives insight on which system is most beneficial for your specific need and can give more information on what system may be needed for future power usage increases. The table below gives guidance on the average usage on the most common types of households over a year and gives a suggested system size. This can help prepare for future power consumption needs. 

What are the Most Common Solar Panel System Sizes?

3kw System

The 3 kW solar system, consisting of 10 to 12 solar panels, is suited for single individuals or couples with modest energy needs. It generates approximately 4,200-5,400 kWh annually, providing enough electricity to power essential household appliances, such as lighting, refrigeration, computers, and televisions. While it may not fully support charging an electric vehicle (EV), it can contribute to some level of EV charging, particularly for occasional or low mileage usage.  

5kw System

Designed for small families, the 5 kW solar system typically comprises 16 to 20 solar panels. It generates around 7,000-9,000 kWh per year, meeting the energy demands of multiple occupants and powering a range of household appliances. With this system, you can comfortably run essential appliances like refrigerators, lighting, computers, televisions, air conditioning, and washing machines. While it may not fully support frequent or high-demand EV charging, it can contribute to occasional or overnight EV charging needs.  

7kw System

With approximately 24 to 28 solar panels, the 7 kW solar system is ideal for larger families. It produces 9,800-12,600 kWh annually, accommodating increased energy consumption from additional occupants. This system can power multiple appliances, lighting, electronics, and other household devices commonly found in larger households. It also offers good EV charging capacity, allowing for regular charging of an electric vehicle with moderate mileage.  

10kw System

Perfect for large families or high energy consumers, the 10 kW solar system consists of 30 to 40 solar panels. It generates 14,000-18,000 kWh per year, supplying substantial electricity for extensive household usage. With this system, you can power multiple appliances, lighting, electronics, and other high energy-consuming devices commonly found in larger households. Additionally, it provides extensive EV charging capacity, supporting frequent or daily charging of an electric vehicle, meeting the transportation needs of electric car owners. 

How Much Space Does a Solar System Need?

A 3 kW system typically consists of around 10-12 panels and can generate approximately 4,200-5,400 kilowatt-hours (kWh) of electricity annually. The physical size of the system may vary based on the specific brand and model of solar panels chosen. On average, each solar panel can have dimensions of approximately (165 cm by 99 cm). Therefore, a 3 kW solar system might require a total roof space of around (24 to 29 square meters). A 10 kW system (72-97 square meters), with around 30-40 panels, can produce approximately 14,000-18,000 kWh per year. 

Factors that Affect What Size Solar System is Needed

Several factors influence the size of a solar system required for an individual or business. First and foremost is the energy consumption demand. Higher energy usage will necessitate a larger solar system. The available roof space is another critical factor. A large roof area allows for more solar panels and, consequently, a bigger system, but will come at a larger initial cost. Geographic location and solar irradiance play a role as well, as areas such as the Sunshine Coast, with higher sunlight levels, require fewer panels. Financial considerations, such as budget and desired return on investment, also influence the system size. Additionally, future energy needs must be taken into account when determining the appropriate size of a solar system. 

How Rebates Can Help With the Cost

Rebates can significantly assist with the cost of purchasing and installing a solar system on the Sunshine Coast. See the Queensland governments website for the latest information regarding rebates and financial incentives. Contact Arc Right Electrical today for a free quote. 

Go Solar with Act Right Electrical

As we look to the future of energy and the growing reliance of renewables, selecting the right size solar system becomes even more crucial. By considering factors such as energy consumption, available space, and location, individuals and businesses can actively contribute to a sustainable energy transition. Understanding the most common system sizes, serves as a foundation for embracing renewable energy and unlocking its potential to power a cleaner and greener future.