Power Your Home with a 15kWh Battery System With Australia's Largest Installer

Save On Your Power Bills

Store excess solar during the day and use it at night when electricity is most expensive. With a 15kWh battery, you'll rely less on the grid and save more long-term.

Quality and Hassle-Free Solar Installation

We handle everything, from system design and approvals to rebates and install, using only CEC-accredited experts and premium brands backed by solid warranties.

Claim Your Battery Rebate

Take advantage of available battery rebates to reduce your upfront costs. Stack it with solar savings and maximise your return from day one.

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4.6

Based on 1.000+ Reviews

Choose the Right Battery Storage Size For Your Home

Small Battery Storage

Best for: Low-usage households that want to store excess solar, cut evening grid use, and keep bills low

Typical appliances: Fridge, washer, LED lights, TV, Wi-Fi, occasional aircon

Monthly power bill: ~$100–$200

Estimated annual savings: Up to $1,000–$1,500

5kWh battery

6kWh battery

Medium Battery Storage

Best for: Families or those working from home who are looking for greater energy independence

Typical appliances: Everything in a small system + dishwasher, daily aircon/heating, home office setup

Monthly power bill: ~$200–$350

Estimated annual savings: Up to $1,500–$2,500

10kWh battery

13.5kWh battery

Large Battery Storage

Best for: Larger homes, families, or solar power users wanting full control

Typical appliances: All the above + pool pump, EV charger, ducted aircon, laundry appliances running daily

Monthly power bill: $350+

Estimated annual savings: Up to $3,000–$4,500

15kWh battery

20kWh battery

30kWh battery

Why Choose a 15kWh Battery Storage for Your Home:

Powerful solution for larger homes

A 15kWh battery is ideal for larger households with high energy use. Think families of 4 or more, pools, EVs, or heavy appliance usage. It can keep your home running well into the night or during an outage.

Take control of your solar energy

Store more of your excess solar and use it when the sun goes down, instead of sending it back to the grid for a low feed-in rate. It’s a smarter way to reduce your bills and maximise your solar investment.

Built for flexibility and growth

A 15kWh system gives you the capacity to support future upgrades like EV charging, additional solar, or even another battery. It’s a future-ready solution that also gives you access to available state battery rebates.

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Choose the Right Solar System Size For Your Home

Small Systems

Best for: Energy-conscious households, singles or couples working during the day

Average daily output: ~18–28 kWh/day

Roof space needed: ~20–35 m²

Estimated annual savings: $1,000 – $1,500+

5kW system

6.6kW system

7kW system

Medium Systems

Best for: Families with moderate to high energy use (e.g. WFH, EV charging)

Average daily output: ~30–44 kWh/day

Roof space needed: ~35–50 m²

Estimated annual savings: $1,600 – $2,200+

Large Systems

Best for: Large households, multiple appliances, EVs, or battery storage integration

Average daily output: 45+ kWh/day

Roof space needed: 55+ m²

Estimated annual savings: $2,800 – $7,000+

Not sure which one is right for you? Speak with our team today

Here's everything you need to know about installing a 15kWh battery system:

Is a 15kWh battery enough for my home?

A 15kWh battery is ideal for large households with higher energy needs and power bills around $500–$800 per month. It can power essential appliances and systems like lighting, fridge, air con, and Wi-Fi, well into the night and provide reliable backup during outages.

How much does a 15kWh battery system cost?

Installed 15kWh battery systems start from $22,500 and could go up, depending on the brand, backup options, and site requirements. Government rebates and interest-free finance may also be available to help lower upfront costs.

Can I add a 15kWh battery to my existing solar system?

Yes! Most modern solar systems can support a battery, and our team can assess your setup to ensure compatibility. If your current system needs an upgrade, we can bundle in new solar panels and inverters to future-proof your system.

Are there government rebates available?

Yes! The federal government launched the Cheaper Home Batteries Program in July 2025, offering rebates that can reduce the cost of battery storage by up to 30%. The rebate amount increases with the size of your battery system, so larger systems receive bigger discounts. Similar to the solar rebate, the rebates for this program will gradually decrease each year and are scheduled to end in 2030.

Will my battery work during a blackout?

Some batteries offer backup power that can keep your lights and essentials running during a blackout. Brands like 1KOMMA5° offer excellent blackout protection. Let us know if this is a priority, and we’ll recommend the right system.

Can I expand my battery in the future?

Absolutely. Many of the batteries we offer like our own 1KOMMA5° battery are modular and scalable. You can start with a smaller system and add more capacity later as your needs grow.

What warranty comes with a 15kWh battery system?

All our batteries come with manufacturer-backed warranties, typically around 10 years. Our 1KOMMA5° battery stands out with a 12-year product warranty, longer than most brands on the market.

These warranties cover both performance and manufacturing defects, giving you confidence that your battery will operate reliably for years to come. On top of that, installation by our CEC-accredited team includes a 30-year workmanship guarantee for added peace of mind.

We’ll walk you through the specific warranty terms for your chosen battery during your consultation.

High-Performance Storage from the World’s Leading Brands

Smart Battery Options for Your 15kWh System

Whether you’re starting with a 15kWh battery system or planning to scale up over time, we offer a carefully selected range of batteries to match your energy usage, budget, and home setup.

We partner with the most trusted names in energy storage so you get reliability, efficiency, and long-term support built in.

1KOMMA5° Battery Other Batteries

You may be eligible for the new federal solar battery rebate. Check if you qualify.

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Testimonials

Join the 1KOMMA5° movement

Take the lead in climate protection - hear from our customers on how they are making a difference.

Your next steps towards a climate-neutral life:

Step 1: Request a quote online.

After you send your request, one of our expert team members will give you a call.

Request a quote

Step 2: We give you personalised advice and recommendations.

Our energy advisors will create a tailored solution based on your needs. We will explain everything and answer your questions on solar rebates, solar installation costs and process, energy management and more.

Step 3: We install your battery system.

Once you've signed off on your quote and made a deposit, we will arrange an installation date that works with your schedule.

Step 4: We stay as your energy partner.

Whether you have questions about energy, warranty issues or service or you're looking to expand to other energy efficient solutions, you can reach out to us at any time.

Partners & Accreditations

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