Average installed solar battery prices – May 2025
| Battery Only* | Battery + Inverter** | |||
| Usable Capacity | Average installed cost | Installed cost per kWh | Average installed cost | Installed cost per kWh |
| 5 kWh | $5,030 | $1,006 | $6,880 | $1,376 |
| 6 kWh | $5,976 | $996 | $7,836 | $1,306 |
| 7 kWh | $6,972 | $996 | $8,792 | $1,256 |
| 8 kWh | $7,568 | $946 | $9,888 | $1,236 |
| 9 kWh | $7,614 | $846 | $9,324 | $1,036 |
| 10 kWh | $8,260 | $826 | $10,060 | $1,006 |
| 11 kWh | $9,086 | $826 | $10,956 | $996 |
| 12 kWh | $9,432 | $786 | $11,472 | $956 |
| 13 kWh | $10,088 | $776 | $12,038 | $926 |
| 14 kWh | $10,724 | $766 | $12,684 | $906 |
| 15 kWh | $11,190 | $746 | $13,290 | $886 |
| 16 kWh | $11,936 | $746 | $14,176 | $886 |
| 17 kWh | $12,682 | $746 | $15,062 | $886 |
| 18 kWh | $13,428 | $746 | $15,768 | $876 |
| 19 kWh | $13,604 | $716 | $16,264 | $856 |
| 20 kWh | $14,320 | $716 | $17,120 | $856 |
*Includes the installation of the battery only. You must already have a hybrid/battery ready system
**Includes an additional inverter so battery can be AC-connected to any existing solar system
An important trend to observe is that as the battery capacity increase, the cost per kWh decreases. This reflects the fact that many of the installation costs are fixed (regardless of what size battery is going in). Although we don’t publish data beyond 20kWh, the average cost per kWh does continue to fall as the battery escalate into commercial sized systems.
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Average battery price per warrantied kWh – May 2025
Batteries usually come with a 10-year warranty and a performance guarantee which ensures a minimum threshold of power can be discharged through the battery in this time (through-put). If you divide the install costs by the minimum through-put you can get an idea of the cost per kWh over the lifecycle of the battery.
| Battery Usable Capacity | Average cost per warrantied output (kWh) |
| 1-5 kWh | $0.45 |
| 6-10 kWh | $0.37 |
| 11-15 kWh | $0.35 |
| 16-20 kWh | $0.32 |
To see our table of some of the solar batteries with the longest minimum through put – check out our warranty comparison guide.
So is battery storage worth it?
At the midway point of 2025 was a key turning point in this equation as the federal battery rebate was introduced which offers a discount of around 30% for a typical 10kWh battery. For most homeowners this shaved around 3-4 years off the payback period of a solar battery and has triggered a large uptake in solar battery adoption.
We’ve developed a federal battery rebate calculator so you can quickly see what the rebate would be for various models of solar batteries. Additionally if you want to take a deeper dive on the payback period and annual saving you can try our battery savings and payback calculator.
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About this data
- Why a big battery could be cheaper than a small battery with the federal rebate? - 19 June, 2025
- Heat Pump Costs – Solar Choice Price Index - 1 June, 2025
- Solar Panel Costs: Solar Choice Price Index | July 2025 - 1 June, 2025
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