Choosing the right size home battery is the difference between a system that pays for itself and one that is too small or oversized for your needs. This guide helps Victorian and Melbourne homeowners work out what battery capacity suits their household, using nothing more than your power bill and a few simple questions.
Quick answer
- Small households (bills under $300 a month): a 10 to 15kWh battery is often enough.
- Average Melbourne families (bills $300 to $600 a month): a 20kWh battery is the popular sweet spot.
- Large homes, pools or EVs (bills over $600 a month): a 30kWh battery gives maximum independence.
Why battery size matters
A battery stores your daytime solar energy so you can use it at night instead of buying expensive grid power. If your battery is too small, you run out in the evening and still draw from the grid. If it is too large, you pay for capacity you never fill. The goal is to match the battery to how much energy your home uses after the sun goes down.
Step 1: Look at your power bill
Your electricity bill shows your average daily usage in kilowatt hours (kWh). In Victoria, an average home uses somewhere between 10 and 20kWh per day, with a good portion of that used in the evening. A rough rule of thumb is to size your battery to cover your evening and overnight usage.
Step 2: Think about when you use power
If most of your usage is in the evening, when solar is not generating, a larger battery makes sense because it shifts more of your bill onto stored solar. If you are home during the day and use power then, a smaller battery may be enough because you are already using solar directly.
Step 3: Factor in the future
If you are planning to buy an electric vehicle, add a pool, or electrify your heating, your usage will rise. Sizing up now can save you upgrading later. Many Melbourne families choose a 20kWh battery as a balance between cost today and headroom for tomorrow.
Matching sizes to our EOFY deals
- 15kWh suits smaller Victorian homes wanting reliable evening backup.
- 20kWh is our most popular size for average Melbourne families.
- 30kWh is ideal for large homes chasing maximum independence and whole-home backup.
Not sure? Let us size it for you
The most accurate way to size a battery is a quick assessment of your bill and usage. Our Victorian team does this for free and recommends the right size, with no pressure to oversize.
Get your free battery quote
Only 14% of EOFY offers left, hurry and claim your offer now. Servicing Melbourne metro and all of Victoria.
