What Size Solar Battery Do I Need In Adelaide?
By Solar Energy Adelaide | 21 April 2025
Investing in solar battery storage is a great way to maximise your solar system’s benefits, reduce your reliance on the grid, and save money on power bills. But how do you determine the right battery size for your home?
The answer depends on factors such as:
- Your household’s energy usage (especially in the evenings).
- How much excess solar energy you generate during the day.
- Your energy goals (self-sufficiency vs. maximising feed-in tariffs).
Let’s break it down.
Not sure which battery brand to choose? Check out our latest Solar Battery Brand Review for 2025 to see the top options available in Australia this year.
Common Solar Battery Sizes
Battery Size | Best For | Estimated Savings |
5kWh | Small households with low night-time usage | Lower savings, longer ROI |
10kWh | Most common size, suits average households | Up to $2,000 per year |
15kWh+ | Larger homes, energy independence seekers | Up to $2,500+ per year |
How to Calculate the Right Solar Battery Size For You
Solar battery storage is measured in kilowatt-hours (kWh)—the unit that represents how much electricity the battery can store and discharge. To find out what size battery is right for you, consider the following:
1. How Much Power Do You Use in the Evening?
Most homeowners use the majority of their electricity after the sun goes down and you want to ensure your battery will store enough power to cover what you tend to use.
Check your electricity bill or smart meter data to see your energy consumption between 6 PM and 6 AM in winter and 8 PM and 6 Am in summer. Typical Australian households might use 5-15kWh of electricity overnight.
If you have an EV that needs to be charged at nighttime you will need to factor in this power usage as well. The amount of power your EV uses will be dependant on how far you drive during the day.
2. How Much Solar Energy Are You Exporting to the Grid?
By looking at how much power you are currently selling back to the grid, you can determine how large of a solar battery your existing solar system will support.
Look at your energy bill or solar monitoring app to see how much excess power you’re sending back. Be sure to compare winter and summer bills to get a best case and worst case scenario for your solar export data.
For example, if you are selling on average 10kwh per day back to the grid you have suitable solar generation for a 10kwh battery.
If the solar generation from your existing system is not adequate for the size of battery you would like, installing additional solar panels to your battery inverter will be the best solution.
3. What Are Your Energy Goals?
- Reduce or eliminate power bills? A 10-15kWh battery is common for homeowners looking to significantly cut or eliminate their electricity costs (potential savings of up to $2,500 per year).
- Sell energy back to the grid? If you’re considering wholesale electricity pricing through someone like Amer or wish to be part of a Virtual Power Plant (VPP), a larger battery with smart energy management could be beneficial.
Is a 5kWh Solar Battery Worth It?
While 5kWh batteries are available, they often provide a lower return on investment. This is because they may not store enough power to significantly reduce grid reliance and the labour costs to install the battery is also similar to larger batteries.
We find most homeowners opt for a 10kWh battery or larger for a good balance of cost vs. savings.
Final Thoughts: Finding the Right Solar Battery for Your Home
Looking for the right solar battery for your home or business?
The best way to ensure you’re getting the most out of your investment is to request a customised quote. This will ensure your battery is compatible with your existing solar setup and designed to meet your specific energy needs and financial goals. A quote will also provide a detailed breakdown of expected savings versus the upfront cost, helping you make an informed decision about whether a battery is the right choice for you.
If you’re in Adelaide or South Australia, our team at Solar Energy Adelaide can help you choose the right battery to maximise your savings and efficiency. Contact us today for a free battery consult on the best solar battery storage solutions for your home or business.
Check out our latest guide on the Top Performing Battery Brands in 2025 — tailored for South Australian homes.
Local, Trusted, and Here to Help – Adelaide’s Solar Experts
As a local, family-run business with over a decade of experience, Solar Energy Adelaide is committed to helping Adelaide residents make informed decisions about solar energy.
We prioritise customer satisfaction and transparency, ensuring you understand exactly how much you’ll save and how the process works.
We also provide comprehensive services, including solar battery storage and solar repairs, so you can get the most out of your solar system for years to come.
Solar power has become a staple for South Aussie homes and businesses.
With rising electricity costs, solar panel installation offers long term savings and financial security with minimal maintenance and solar rebates available.
Ready to gain energy independence? Dreaming of a day with a $0 power bill?
With a solar battery for your home or business, you can store your excess energy and use it when you need it most.
Solar battery storage has become more affordable in recent years and can even be added to most existing solar systems.
Worried your solar system is underperforming?
If your solar system is not covering between 60-90% of your energy needs there is likely a problem that needs attention.
Our skilled technicians handle all aspects of solar system servicing, including solar panel repairs, solar inverter repairs and solar warranty assistance.