As Australian households increasingly shift toward renewable energy, solar batteries are becoming more common. These batteries capture surplus solar energy produced during the day and make it available after sunset or during power interruptions. But the question many homeowners ask is simple: How much does a solar battery cost?
Let’s break it down without hype, gimmicks, or recycled answers.
According to industry data, the average cost of installing a 10 kWh solar battery in Australia, including installation, is between $10,500 and $12,000. The final figure depends on battery size, brand, compatibility with your existing system, and labour fees.
This guide will cover cost breakdowns, size comparisons, and essential questions about installing solar batteries in Australian homes.
What Determines Solar Battery Costs?
The price of a solar battery isn’t just based on the unit itself. Here’s what drives the total cost:
1. Battery Capacity (kWh)
Battery prices increase with their storage capacity the greater the energy they can hold, the higher the cost. Standard sizes range from 5 kWh to over 15 kWh:
- 5–7 kWh: $5,000 – $8,000
- 10 kWh: $10,500 – $12,000
- 13.5+ kWh: $13,000 – $16,000
2. Battery Type
Lithium-ion batteries dominate the market due to their efficiency and compact size. Lithium iron phosphate (LiFePO4) versions offer better thermal stability and cycle life.
3. Brand & Features
Brands like Tesla, NeoVolt, and Sonnen offer features such as smart monitoring, app integration, and full-home backup capabilities—all of which add to cost.
4. Hybrid vs Retrofit Installation
Installing a battery with your solar panels (hybrid system) is usually cheaper. Retrofitting one into an existing system can add $1,000–$3,000 more in equipment and labour.
5. Installation Complexity
Older homes may require switchboard upgrades or complex rewiring. Labour costs also vary based on location and installer.
How Much Does a Solar Battery Cost to Install?
Solar battery installation costs typically range between $1,500 and $3,000 across Australia. This includes labour, electrical modifications, software setup, and grid compliance. Costs increase if your system is older or if additional parts (like inverters) are needed.
How Much Does a 10kW Solar Battery Cost?
A 10kW battery costs around $10,500 to $12,000 in Australia, including installation. This size is ideal for average family homes with moderate to high energy needs. It balances upfront cost and energy independence, often paired with solar panel systems between 6.6 and 10 kW.
How Much Does It Cost to Install a Battery in a Solar System?
Adding a battery to an installed solar system typically costs $1,000 to $4,000 more than installing one upfront. Retrofitting requires additional hardware like battery inverters or control units, so upfront installation during a solar system upgrade is the more budget-friendly option.
How Much is a 13.5 kW Solar Battery?
A 13.5 kW battery, such as the Tesla Powerwall 2, ranges from $13,000 to $15,000 fully installed. These larger units offer significant energy storage, suitable for bigger homes or users wanting full-night backup and lower reliance on the grid.
Are Solar Batteries Worth It?
Yes, solar batteries are worth it for many Australians. Here’s why:
1. Lower Power Bills
Tapping into stored solar power during high-rate periods can significantly reduce your reliance on the grid, potentially saving you up to $1,000 per year.
2. Grid Independence
Battery owners reduce their dependence on retailers and gain peace of mind during outages.
3. Payback Period
Solar Batteries’ usual payback period is 5 to 12 years, influenced by:
- Electricity rates
- Usage habits
- Government incentives
- Tariff structures
4. Solar Battery Rebates
States like SA, VIC, and NSW offer rebates between $2,000 and $4,000, which significantly lower upfront costs.
Solar Battery Cost Comparison by Size
| Battery Size | Installed Price | Ideal For | Annual Savings |
|---|---|---|---|
| 5 kWh | $5,000 – $7,000 | Small homes | $300 – $600 |
| 7 kWh | $7,000 – $9,000 | 2–3 person households | $450 – $800 |
| 10 kWh | $10,500 – $12,000 | Average family homes | $600 – $1,000 |
| 13.5 kWh | $13,700 – $15,000 | Large homes or heavy users | $900 – $1,300 |
| 15+ kWh | $15,000 – $18,000+ | Off-grid or full backup homes | $1,100+ |
How to Choose the Right Battery
- Match Capacity to Daily Usage: Avoid under- or oversizing. A 10 kWh battery suits most family homes, while solo households can get by with 5–7 kWh.
- Choose Lithium Over Lead: Lithium-ion batteries have a higher depth of discharge and last longer. LiFePO4 types offer better safety and lifespan.
- Prioritise Warranty & Cycles: Look for at least 5,000 cycles and 10-year warranties for long-term savings.
- Check System Compatibility: Make sure your battery and inverter can communicate. Hybrid systems reduce compatibility issues.
- Go Smart: Smart monitoring lets you optimise energy use and identify problems before they escalate.
- Don’t Miss Rebates: Look into state-level battery rebates—they can knock off thousands and shorten your payback time.
Final Thoughts
While solar battery prices in Australia remain a significant investment, the long-term benefits make them worthwhile especially as electricity rates continue to climb. Whether you aim to reduce power bills, increase energy independence, or secure backup during outages, choosing the correct battery can deliver solid, lasting value.
If you’re serious about making your home more energy efficient, now’s the perfect time to explore your options. Contact Greenlight Solar to compare systems, get expert advice, and find a solar battery setup that fits your needs and budget.
FAQ:
Are solar batteries worth it in Australia in 2025?
Yes, especially for homes with high daytime usage or time-of-use tariffs. With rebates in some states and rising power prices, solar batteries offer increasing value.
What is the lifespan of a solar battery?
Most lithium-ion solar batteries last between 10 to 15 years and offer between 5,000 to 7,000 charge cycles, depending on the brand and model.
How long does it take to recover the cost of a solar battery?
The typical payback period is between 5 and 12 years, depending on your energy consumption, electricity rates, and whether you’re eligible for government rebates.
How much does a 5kWh or 10kWh solar battery cost in Australia?
A 5kWh battery starts around $5,000, while a 10kWh battery (including installation) ranges from $10,500 to $12,000. Pricing varies based on brand, features, and installation needs.
Can I add a battery to my existing solar system?
Yes. However, retrofitting a battery usually costs more than installing it alongside a new system. You may need a compatible inverter or additional hardware.
Do solar batteries work during a blackout?
Only if your system is designed for backup power. Some batteries like the Tesla Powerwall support backup during outages, while others may require additional setup.
