The right battery size for your household will depend on your household’s energy consumption and habits, your solar system’s output, and your energy goals.
Installing the correct battery size for your requirements will help you lower your electricity bills, maximise your solar investment and lower your carbon emissions.
When you request a solar and/or battery quote from Kleenheat, we’ll ask you to provide information about your energy usage and future needs, and ask if you have an existing solar system, so we can recommend a battery that is suitably sized for your home.
Understanding your energy usage
To recommend the right-sized battery for your home, we’ll ask you to provide your average electricity usage and upload a copy of your most recent electricity bill. We’ll also ask about when you use most of your electricity (e.g. at night or during the day) and whether you expect to buy any high-energy items or appliances in the future that would increase your electricity use, such as electric vehicles (EVs) or air conditioning.
Below is a rough guide to the battery sizes we may recommend for typical household sizes and electricity usage. Head to our online tool to see what battery size we recommend for your home.
| Household type | Daily usage (kWh) | Suggested battery size (kWh) |
| Single person | 8 - 12 | 5 - 12 |
| Couple or small household | 12 - 18 | 12 - 18 |
| Family | 18 -25 + | 18+ |
Matching your battery size to your solar system
The size of your battery needs to complement your solar panel output. If your panels generate more energy than you use during the day, a battery allows you to store that excess energy instead of exporting it to the grid.
As a general guideline, your battery’s capacity should be about 1.5 times the size of your solar system to ensure enough storage for excess solar energy generated, however, our online tool will give you tailored recommendations based on your energy usage and other unique characteristics.
Your solar system size is measured in kilowatts (kW), which indicates how much power your panels can produce at a given moment. Battery capacity, on the other hand, is measured in kilowatt-hours (kWh), which reflects how much energy can be stored and used later.
Aligning your battery size with your energy goals
If most of your energy usage is during the day, a smaller battery may be enough. But if you want to improve your energy independence or expect your energy usage to grow, you’ll benefit from more battery capacity.
Maximise solar self-consumption
To store solar energy generated during the day for nighttime use, your battery will need to match your evening and overnight electricity usage.
Reduce bills
Batteries help you avoid buying electricity during peak rate periods. The more you store and use your own solar, the less you pay in rates. A larger battery will allow for more peak-time coverage, especially if your usage is high in the evening.
Your budget, rebates and financing
Battery prices vary based on brand, capacity, and features. Larger batteries cost more upfront but will often offer a better return on investment, particularly for high nighttime users or those who plan to increase their energy usage in the future.
Both the WA and Federal governments now offer solar battery incentives to help reduce the cost of installing a home battery. You can learn more about the WA and Federal Government battery incentives and their eligibility criteria here. If you request a quote from Kleenheat, we’ll automatically apply any rebates you’re eligible for to the recommendations we provide online. If you accept a quote from us, our installer partner will claim any rebates you’re eligible for on your behalf.
Find out what-sized battery will suit your needs
Simply head to our Kleenheat Spark online tool to get three personalised recommendations for solar and battery (or battery only) packages. We’ll ask you about your home and energy usage so we can recommend the battery size that will best meet your current and future energy needs.