SOLAR BATTERY STORAGE SYSTEM
70KWh
Large homes & mid-size business
$23,399*
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70kWh Solar Battery
A 70kWh solar battery is a large energy storage solution for properties with high electricity demand. It stores excess solar power during the day and makes that energy available later, especially at night, during peak electricity periods, or during outages if the system is designed for backup power.
In Australia, a 70kWh battery is usually more than a standard household battery. It is better suited to large homes, EV charging, small businesses, farms, workshops, commercial sites, and properties that want stronger energy independence. Under Australia’s current battery incentive framework, eligible battery systems must generally fall between 5kWh and 100kWh nominal capacity, while STC support applies only to the first 50kWh of usable capacity
20kWh/day
Around 3.5 days
of energy use
35kWh/day
Around 2 days
of energy use
70kWh/day
Around 1 full day
of energy use
DISCOVER THE BEST SOLAR BATTERY FOR YOUR SOLAR SYSTEM
60KWh
Solar Battery
Large homes & Small businesses
$
20,199
*
Small Home
- Complete Energy Solution
- 24/7 Power Backup
- Seamless Integration
- High-Quality Energy Storage
70KWh
Solar Battery
Large homes & mid-size business
$
23,399
*
Medium Home
- Complete Energy Solution
- 24/7 Power Backup
- Seamless Integration
- High-Quality Energy Storage
80KWh
Solar Battery
Large homes & mid-size business
$
27,699
*
Big Family Home
- Complete Energy Solution
- 24/7 Power Backup
- Seamless Integration
- High-Quality Energy Storage
What Is a 70kWh Solar Battery?
A 70kWh solar battery is a battery storage system that can store up to 70 kilowatt-hours of electric power, depending on the capacity specifications (nominal or usable). In simple terms, kWh represents how much energy the battery can store. As the kWh rating gets higher, the longer the battery can supply power to appliances, equipment and electrical loads.
A 70kWh battery system can consist of one large battery cabinet or smaller battery units that are linked together. For instance, a number of 10kWh, 14kWh or 20kWh battery modules may be linked together to create a bigger storage system.
This makes 70kWh batteries suitable for:
- Large homes with high energy usage
- Homes with ducted air conditioning, pools or electric heating
- Properties with EV chargers
- Small commercial buildings
- Farms and rural properties
- Sites wanting strong backup protection
- Businesses wanting to reduce peak demand charges
For many standard homes, 70kWh may be larger than necessary. But for energy-hungry properties, it can provide excellent solar self-consumption and energy independence.
How Much Power Can a 70kWh Solar Battery Store?
A 70kWh solar battery can store 70 units of electricity. One kilowatt-hour means using 1 kilowatt of power for 1 hour.
Here is a simple guide:
These numbers are theoretical. Actual runtime may be lower because not every battery allows the full nominal capacity to be discharged. Inverter size also matters. For example, a 70kWh battery with a small inverter may store plenty of energy but may not be able to run many heavy loads at the same time.
How Does a 70kWh Solar Battery Work?
A 70kWh solar battery stores excess electricity generated by your solar panel system for later use. During the day, solar panels produce electricity, which is first used by your property. Any unused energy can charge the battery or be exported to the grid.
1. Solar panels generate electricity
2. Your property uses solar power first
3. Excess solar charges the battery
4. The grid can also charge the battery
5. Stored energy is used later
6. Backup power supports essential circuits
A 70kWh battery system usually requires proper inverter sizing, load calculations, switchboard checks and compliance with Australian installation standards.
Who Needs a 70kWh Solar Battery in Australia?
A 70kWh battery is suitable for properties that use a large amount of electricity and want to store more solar energy instead of exporting it to the grid.
It may be suitable for:
- Large family homes
- Homes with electric vehicles (EVs)
- Properties with ducted air conditioning
- Homes with pool pumps and electric hot water
- Small businesses
- Farms and rural properties
- Cafés, restaurants, and retail shops
- Workshops and warehouses
- Medical clinics and offices
- Sites with refrigeration or extended operating hours
For a small home with low energy use, a 70kWh battery may be too large. Battery sizing should always be based on actual electricity bills, half-hourly consumption data where available, solar generation, tariff structure, and future energy needs.
70KWh Solar Battery Price in Australia (2026)
A 70kWh solar battery price generally starts from around $23,399 AUD. The final price may vary depending on the battery brand, inverter compatibility, system design, site condition, and electrical requirements.
Installation Cost
Installation cost is usually around $2,000–$5,000 AUD, depending on wiring work, inverter setup, labour cost, switchboard condition, and overall installation complexity.
70kWh Solar Battery Warranty & Lifespan
70kWh Solar Battery and Solar Panel System Size
A 70kWh battery should be paired with a solar system large enough to charge it properly. If your solar panel system is too small, the battery may not fill during the day, reducing the value of the investment.
As a general guide:
- 10kW solar system: may be too small for a 70kWh battery unless energy usage is low and backup is the main goal
- 15kW–20kW solar system: may suit some large homes with moderate battery cycling
- 20kW–30kW solar system: more suitable for high-consumption homes, EV charging or small business use
- 30kW+ solar system: may suit commercial sites or very high-energy properties
The right solar size depends on daily usage, daytime and night-time demand, EV charging needs, roof space, inverter capacity, export limits, and local network rules. A large battery should only be installed after proper solar and load analysis.
70kWh Solar Battery vs 60kWh Battery: Which One Should You Choose?
A 60kWh battery and a 70kWh battery are both large storage options. The better choice depends on your energy use.
- Choose a 60kWh battery if your energy demand is high but not extreme, your solar system is moderate, or you want a lower upfront cost.
- Choose a 70kWh battery if you have higher night-time demand, more EV charging needs, larger business loads, or stronger backup requirements.
The extra 10kWh can be useful, but only if you can charge and use it regularly. If that extra capacity remains unused, the 60kWh option may deliver better value.
Why Choose Aussie Solar Tech for Large Solar Battery Storage Solutions
Choosing the right installer is just as important as choosing the right battery. Large battery systems require technical knowledge, compliance awareness and careful planning.
Aussie Solar Tech provides solar panels, inverters, battery storage, EV chargers, heat pumps and related services across multiple Australian states. The company states that it is a NETCC Approved Solar Retailer, has Clean Energy Council and Smart Energy Council membership, and uses CEC/SAA-accredited solar installers and designers.
For large storage systems, Aussie Solar Tech can help with:
- Energy usage assessment
- Battery and solar system sizing
- Hybrid inverter selection
- Backup power design
- EV charger integration
- Commercial and residential battery solutions
- Rebate guidance
- Professional installation and after-sales support
A 70kWh battery is a major investment, so working with an experienced solar battery provider can help reduce design mistakes and improve long-term performance.
Frequently Asked Questions
How big is a 70kWh battery?
A 70kWh battery is a large energy storage system that can store 70 kilowatt-hours of electricity. It is typically suitable for high-energy homes, EV charging, small businesses, or commercial use. Its physical size varies by manufacturer but usually stands over 1.5 meters tall with multiple modular units stacked vertically.
How much does a 75kWh battery cost?
A 75kWh battery price generally starts around $24,990 AUD. The final price may vary depending on the brand, installation requirements, inverter compatibility, and system design.
How much does a 50kWh solar battery cost?
A 50kWh battery generally starts around $16,499 AUD. Installation costs may add an extra $2,000–$5,000 AUD, depending on wiring, inverter setup, and labor.
How long will a 50kWh battery power a house?
The duration depends on your home’s daily electricity consumption:
- If your home uses 20kWh/day, a 50kWh battery could power it for around 2.5 days.
- If your home uses 50kWh/day, it could last roughly 1 day.
Actual performance depends on usable capacity, solar production, and simultaneous electricity usage.
What is the difference between kW and kWh?
kW (kilowatt) measures power, or how fast electricity is being used.
kWh (kilowatt-hour) measures energy, or how much electricity is used over time.
For example, running a 1kW appliance for 1 hour uses 1kWh of energy.
How long will a 60kWh battery last?
Yes, in most cases you can add a 60kWh battery to an existing solar system. However, you may need a compatible hybrid inverter or additional battery inverter to integrate the storage system properly. Installation costs can also increase if electrical upgrades are required.
WE INSTALL CEC APPROVED POPULAR SOLAR BATTERIES IN AUSTRALIA
- Tesla Powerwall
Great for storing solar energy at home because it is very efficient and lasts a long time.
- Sungrow Battery
Works well and is affordable. It can be used in homes and businesses.
- Sigenergy Battery
A dependable storage option that focuses on being eco-friendly and simple to use.
- Growatt Battery
A small, affordable option that works well.
- Alpha ESS Battery
Reliable, efficient, and smart energy storage for home and business.
- GoodWe Battery
A solar storage battery that is reliable, long-lasting, and very efficient.
