Simple Battery Sizing Calculator
Find the Right Battery Size for Your Home
Not sure what size battery you need for your solar system? You’re not alone. Our quick and easy Battery Sizing Calculator will help you estimate the ideal storage capacity based on your daily electricity usage and how much of your energy is used at night—when your solar panels aren’t generating power.
🧮 Find the Right Battery Size for Your Home
Just select:
- Your average daily electricity usage in kilowatt-hours (kWh) on the left row
- The percentage of your electricity typically used at night columns along the top
It will calculate a recommended battery size that fits your energy profile and goals.
Tip: The most common night usage is 75% meaning that your are home 75% of the of week.
âš¡Why Battery Sizing Matters
Choosing the right battery size is key to:
- Maximising your solar savings
- Keeping the lights on during blackouts
- Avoiding over- or under-investing in storage
A battery that’s too small might not cover your night-time needs. Too large, and you’re paying for capacity you’ll never use. This calculator helps strike the perfect balance.
Home Battery Sizing Calculator
| Daily Usage (kWh) | 25% Night Usage (kWh) | 50% Night Usage (kWh) | 75% Night Usage (kWh)Â | 100% Night Usage (kWh) |
| 5 | 1.25 | 2.5 | 3.75 | 5 |
| 10 | 2.5 | 5 | 7.5 | 10 |
| 15 | 3.75 | 7.5 | 11.25 | 15 |
| 20 | 5 | 10 | 15 | 20 |
| 25 | 6.25 | 12.5 | 18.75 | 25 |
| 30 | 7.5 | 15 | 22.5 | 30 |
| 35 | 8.75 | 17.5 | 26.25 | 35 |
| 40 | 10 | 20 | 30 | 40 |
| 45 | 11.25 | 22.5 | 33.75 | 45 |
| 50 | 12.5 | 25 | 37.5 | 50 |
| 55 | 13.75 | 27.5 | 41.25 | 55 |
| 60 | 15 | 30 | 45 | 60 |
🚀 Ready to Take the Next Step?
Once you know what size battery you need, we can help you compare systems and get free quotes from qualified, CEC-accredited installers in your area.
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