Solar System Size: What Size Solar System Do I Need? - Jackery Australia

Solar System Size: What Size Solar System Do I Need?

Solar System Size: What Size Solar System Do I Need?

If you are contemplating going solar, you must determine the size of the solar system required to power your property in Australia using solar energy. The amount of electricity a solar photovoltaic system can produce is called its size or capacity. However, it is crucial to clarify that the focus here is not on the quantity of solar panels but on the system's overall ability.

what size solar system do i need

Although numerous online platforms provide solar panel system size calculators, multiple factors and considerations must be considered. From this page, you will thoroughly understand what size solar system you need with detailed steps and guidelines. In contrast to rooftop solar systems, the Jackery Solar Generator is a portable solar system that offers a greater capacity and a more affordable price point, enabling you to power most of your appliances off the grid. 

Key Takeaways:

  • When determining the size of a solar system for a residential property, it is crucial to consider your power usage, sunlight in your area, roof spaces and solar panel wattage.

  • Knowing your residence's current and potential future electricity consumption is necessary to size your solar system accurately.

  • Simply put, the solar intensity per square metre generates 1,000 watts of energy over an hour. Queensland's extensive coastal region, which extends over nearly 20 degrees of latitude, provides abundant sunlight hours.

  • PV solar energy systems are quantified in kilowatts (kW) or watts (W). Approximately 4 kWh of electricity is generated daily by 1 kW of solar panels.

  • The optimal solar system size in terms of ROI is 6kW. The optimal size for the daytime focus electricity consumption profile is 6kW.

  • Except for the rooftop solar systems, you can also choose a portable solar system -Jackery Solar Generator 2000 Plus, 2000 Pro, or 1000 Pro to charge household appliances off the grid.

What Factors Affect What Size Solar System Do You Need? 

The optimal return on investment for solar systems is achieved when the solar output is matched to the daily energy needs of the residents. By aligning the energy output of solar panels with the power demands of a residential dwelling, one can reduce the amount of excess energy that must be exported to the power grid. Due to the reduced feed-in tariffs, selling electricity back to the grid is no longer economically viable.

When determining the appropriate scale of a solar system for a residential property, it is crucial to consider the following factors:

  • Your Power Usages: More solar panels are required to offset the electricity expense in proportion to one's electricity consumption. Your electricity usage profile takes into account your daily electricity consumption. People are frequently at school or work during the day, so the mornings and evenings are when the average household consumes the most energy.

  • Sunlight in Your Area: To eradicate electricity costs, dwellings in regions with less sunlight require more solar panels than those in sunnier states. Generally, the southeastern part of Australia receives the most miniature sun (occasionally exceeding 12 hours per day), whereas the northwestern region gets the most.

  • Your Roof Space & Location: Solar photovoltaic (PV) systems are a standard method to embrace renewable energy; however, purchasing the correct size for your roof and energy requirements is crucial. The rooftop's dimensions, orientation, and configuration will dictate the optimal system size for installation. The typical dimensions of solar panels are 1.7 metres by 1 metre. A 6kW solar photovoltaic system would require approximately 20 meetings. Physically, the panels must fit on the roof without obstructing any ventilation, antennas, or chimneys.

  • Solar Panel Wattage: The amount of energy solar panels output is determined by their wattage, also known as their power rating. Most solar panels installed today have a power rating of approximately 300 watts per panel; fewer panels are required when installing panels with high wattage ratings.

What Size Solar System Do You Need? 

An initial factor to consider when determining the size of your solar system is the manner and timing of your household's electricity consumption. Your daily consumption will be influenced by various factors, such as the number of occupants in your home, the appliances you own, and the frequency with which you operate them.

Determining the needed scale of a solar system is more straightforward than one might expect. After selecting the quantity of sunlight that strikes your roof and the energy you consume, you can approximate the number of solar panels that should be installed.

how to determine what size solar system do i need

Step 1: Figure Out Your Power Consumption

Knowing your residence's current and potential future electricity consumption is necessary to size your solar system accurately. Obtaining this information from previous electricity invoices is the simplest method; they should detail the energy consumed in the last month or quarter. This information can be used to calculate the average daily usage.

The unit of measurement and billing for your electricity usage is kilowatt-hours (kWh). The average Australian household consumes 15 to 20 kWh daily. Many factors, including the number of people living there, location, cooking, and heating, can lead to considerable differences in a home's electricity usage.

Be very careful when working with electricity. Does most of your electricity consumption occur in the evening, when everyone is at work or school, and your home is typically deserted on weekdays? If this is the case, the operational efficiency of your solar panels may be compromised, given that it is more efficient to utilise the energy produced during the day (or to charge a storage battery) rather than import it into the grid.

Step 2: Check Sunlight Your Home Gets

Now that you know your residence's monthly electricity consumption, you must determine the quantity of sunlight that falls on your region. The intensity of sunlight at a specific location is quantified in peak sun hours, which indicate the amount of sunlight that falls on a given area.

Simply put, the solar intensity per square metre generates 1,000 watts of energy over an hour. Occasionally, we use the term "peak sunlight hours" to denote peak solar hours; the exact number of such hours fluctuates daily and geographically. Knowing the usual peak sun hours in your region before considering solar panel installation on your home is essential.

Queensland's extensive coastal region, which extends over nearly 20 degrees of latitude, provides abundant sunlight hours; in fact, the city of Brisbane experiences an average of seven to eight prime sun hours daily. South Australia exhibits considerable variability in the number of daylight hours. As the most southerly and distant state from the equator, Tasmania receives less sunlight than most of the continent's other regions. Specifically, the island's western coast receives even less precipitation than the eastern coast.


Average Peak Sun Hours Per Day





Gold Coast








(Data Source: Hot Spot Energy)
Fewer solar panels can offset energy expenses if your residence receives more sunlight. Frequently, peak solar hours are expressed as daily values. This must be converted to hours per month or year, depending on whether you calculate annual or monthly energy consumption. These must correspond to accurately estimating the number of solar panels required.

Step 3: Determine How Much Solar Energy Need

Utilise the number of prime sun hours in your region to calculate the kilowatt-hours of electricity that a solar panel can produce. PV solar energy systems are quantified in kilowatts (kW) or watts (W). There will be system designations such as 4kW, 5kW, 10kW, etc.

The watt or kilowatt is a measurement unit for the energy transfer rate. 1 kW is equivalent to one thousand watts. The wattage rating of solar panels indicates the utmost power output that the board can produce at any given moment. A unit of energy production or consumption over time is the watt-hour. Your electricity bill will be denominated in kilowatt-hours (kWh) as you are gradually charged for your electricity consumption.

kWh (kilowatt-hours) = (Watt x 1000)*Hours

Approximately four kilowatt-hours (kWh) of electricity are generated daily by one kW of solar panels. One kilowatt of solar panels generates about four kilowatt-hours of electricity per day. A 6kW solar system can produce approximately 24kWh on a favourable day, with ample sunlight and moderate temperatures.

Generally, the precise quantity of electricity produced per kilowatt-hour (kW) by solar panels is contingent upon various factors such as geographical location, seasonal sunlight availability, system quality, panel orientation, age, and more.

Multiply the number of peak sun hours in a given month by the wattage of a solar panel to determine the monthly electricity output of a solar panel in your region. To match the energy consumption listed on your electricity invoices, you must convert this from watt-hours to kilowatt-hours via division by 1,000.

Solar Power (kWh) = (Solar Panel Watts x Monthly Peak Sun Hours) / 1000

Consider the following example. Presently, the majority of solar panels are 300 watts in capacity. A 300-watt solar panel installed in a location that receives 120 peak sun hours per month would produce approximately 36 kWh of electricity.

Step 4: Decide What Size Solar System Need

Now you know how much power you consume and how much energy a solar system can produce where you live, you're ready to figure out how big of a solar system you need. To ascertain this, divide your energy consumption by the quantity of solar energy produced by a single solar panel. This will estimate the quantity of solar panels required to pay the specified amount of electricity.

In light of the report's findings and the 20 kWh of electricity consumed during the morning and evening prime hours, the optimal solar system size in terms of ROI is 6 kW. The optimal size for the daytime focus electricity consumption profile is 6kW.

System Size

Install Cost

Annual Savings

Payback Time




5.1 Years




4.8 Years




4.7 Years




4.6 Years




4.9 Years




5.2 Years

(Data Source: Solar Choice)

The scale of the solar photovoltaic system that is currently required may be different in a few years. For instance, day-to-day energy consumption is likely to increase as you contemplate the installation of a pool or air conditioner, the purchase of an electric vehicle, the commencement of remote work, or the arrival of a new family member. It may be more straightforward and economical to plan and purchase a more extensive solar PV system from the start instead of attempting to add to it in the future.

how jackery solar generator works

A portable solar power system can be a stable power source for outdoor activities such as camping, RVing, and residential backup. With its increased capacity, the Jackery Solar Generator, which combines solar panels with a mobile power station to convert sunlight into electricity, is the most effective portable solar system. The Jackery Portable Power Station has a premium lithium battery, an MPPT charge controller, and a pure sine wave inverter to ensure a stable and consistent power supply.

What are the benefits of solar systems for Homes?

Solar energy for residential use is, with good reason, a popular topic. In recent years, the quantity of solar power connected to the electrical grid has increased exponentially. 'Going solar' has numerous advantages, and our sun-drenched nation is an ideal location for solar energy.

Better for Environment: One environmentally friendly method to power a residence or business is solar energy. Since solar energy is used to generate electricity rather than fossil fuels, there are no direct emissions of greenhouse gases. Since sunlight is a renewable energy source, its supply will never be depleted. As fossil fuels, gas and coal will ultimately be depleted. And our tropical state receives an abundance of sunlight throughout the entire year.

Save Electricity Bills: One way to reduce their monthly power bill is to use the electricity from their solar panels throughout the day instead of drawing power from the grid. You can meet part of your energy needs using your solar system. This should reduce your electricity consumption costs. Your electricity consumption and the scale of your solar system will determine how much you save.

Add Value to Your Home: After being paid for, solar panels will save money and help the environment for a long time. The potential savings over a lifetime can exceed $50,000. The value of a home increases automatically when solar panels are installed.

Jackery Solar Generators - Portable Solar Systems

Due to the considerable costs of rooftop solar systems, an individual might consider investing in a portable solar system. Jackery Solar Generators are off-grid living and mobile solar systems. PV generators can also supply power to various appliances, including washing machines, microwaves, refrigerators, ovens, etc.

By integrating Jackery Solar Panels with a Portable Power Station, the Jackery Solar Generator provides camping, off-grid living, and RVing with dependable and eco-friendly electricity. In addition to increasing electricity generation by more than 25% (at a power conversion rate of 25 per cent), the Jackery Solar Panels include a lithium-ion rechargeable power station of superior quality. By utilising the MPPT charge controller and battery protection system, the power station ensures the security of its capacity to charge household appliances.
jackery solar generators comparison

Jackery Solar Generator 2000 Pro

Combining the Jackery Explorer 2000 Pro and SolarSaga 100W solar panels, the Jackery Solar Generator 2000 Pro has a combined capacity of 2160Wh and an output of 2200W. When dependable electricity is required for off-grid living, home backup, other outdoor activities, or power outages, the Solar Generator 2000 Pro is the optimal solution.

When utilised twice weekly, the Jackery Explorer 2000 Pro portable power station retains its ten-year operational lifespan. It is a dependable residential backup power source with a standby capacity of one year. The product is considered optimal owing to its cutting-edge characteristics:
  • A high-contrast, user-friendly interface
  • Efficient charging (requiring a mere two hours with AC input)
  • Robust security facilitated by a BMS of the highest calibre
  • The portability-enhancing 19.5-pound weight and collapsible handle are distinguishing features of the portable generator.
jackery solar generator 2000 pro
The high-performance Solar Generator 2000 Plus, which Jackery introduced, signifies a significant advancement in portable power alternatives. Due to its considerable capacity and outstanding power output, it can provide power for standard van utilities for several weeks and fulfil the power demands of outdoor exploration or home backup power supply.

Incorporating battery cells into the Jackery Solar Generator 2000 Plus substantially increases the capacity from 2 kWh to 12 kWh, bringing about a paradigm shift in supplying residential reserve power. Capable of expanding to 3000W, this product exhibits a 30% increase in rated power compared to rival 2 kWh products. Powered devices make up an overwhelming majority of fundamental residential appliances. Despite its consistent daily use, the advanced LiFePO4 battery has ten years of protracted operational expectancy.
jackery solar generator 2000 plus
The Jackery Solar Generator 1000 Pro combines 80W SolarSaga solar panels with the Explorer 1000 Pro portable power station, is an exceptionally silent solar generator (as low as 46dB), has a minimum ten-year lifespan, and can be fully charged in 1.8 hours. Constant power is supplied to all essential appliances throughout off-grid living, camping, RVing, and other outdoor activities due to its dual 100W PD construction.

With a capacity of 1002Wh, the rechargeable Explorer 1000 Pro power station can supply energy to 93% of appliances, including but not limited to a television, CPAP machine, refrigerator, and E-bike. Furthermore, it equips mobile devices, laptops, iPads, and iPads with consistent and swift charging via its two 100W PD connectors and USB-C interfaces. The MPPT technology guarantees a solar charging efficiency of 99 per cent. The power station's recharge duration is reduced to less than 1.8 hours. Furthermore, it is advisable to utilise solar recharge and wall and vehicle recharging methods.
jackery solar generator 1000 pro

What Size Solar System Do I Need FAQs

The following are the most frequently asked questions about what size solar system you need in Australia:

1.What size solar battery do I need?

A storage battery is designed to store surplus solar energy produced during the day to be utilised at night or on days with little sunlight. The incorporation of batteries into installations is growing in popularity. In the coming years, battery prices, technological advancements, and future developments in the electricity market will likely render batteries a viable option for most households.

Regarding the portable solar system, one may opt for a Jackery Solar Generator with a capacity varying from 12 kWh to 240Wh, contingent upon their specific energy needs. The operational hours of appliances powered by Jackery Solar Generators are calculated using the subsequent formula:

Working Hours (H) = [Jackery Solar Generator Capacity (Wh)*0.85] / Appliance's Wattage (W)

5.8 hours of power can be supplied to a 300W projector by the Jackery Solar Generator 2000 Plus (2042.8Wh) (2042.8*0.85/300). This equation facilitates determining which appliances need only minimal upkeep to sustain operation.

2.Is 6.6 kW solar enough for a house?

Not only is the transition to solar energy an intelligent financial choice, but it is also a significant stride towards an eco-friendly and sustainable way of life. A residential solar panel system that combines 6.6 kW of panels with a 5 kW solar inverter is among the most popular. It is an inexpensive and dependable solution with a substantial return on investment. It will assist you in reducing your electricity expenses and make a positive environmental impact for future generations.

In addition, a 6.6kW solar system provides enduring advantages that surpass the initial investment required for installation. The system can provide consistent electricity for at least 25 years with proper maintenance, thereby decreasing your dependence on conventional energy sources.

Generally, a 6.6 kW solar system provides a dependable and economical energy supply to a typical household. Anyone looking to reduce their electricity expenses and carbon footprint would benefit significantly from choosing this solar system size because of its high energy production, battery compatibility, and outstanding performance.

3.How much does a solar system cost?

Solar panel acquisition requires a long-term investment. The financial viability of a system is determined by its cost, savings, and return period. Solar panels are generally a worthwhile investment in 2024, owing to their durability and the relatively brief payback periods that can be attained in various locations across Australia.

The following table details the mean expenses of homes' solar power systems. Solar panel costs fluctuate due to a variety of factors. The two most significant variables are the quality of components (panels and inverters) and the installation company you choose.

Solar System Size


3 kW


5 kW


6.6 kW


10 kW


(Data Source: NECTR)

Suppose you believe that residential rooftop solar systems are prohibitively expensive. In that case, consider investing in a portable solar system such as the Jackery Solar Generator, which costs only half as much. 

Final Thoughts

Solar systems can significantly reduce your energy costs and help you save money over time. However, determining which system capacity to purchase for your home can take time and effort. Especially if your household consumes more energy than most, from this page, you will get a thorough understanding of what size solar system you need. In contrast to residential grid-connected solar systems, the Jackery Solar Generator is a portable solar system that can power essential household appliances off the grid. 

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