15kW Solar Battery Price: Cost, Installation, & Best Deals in Australia
Everything from high gas prices to ageing coal stations are responsible for the rising electricity bills Australian homeowners and businesses are currently experiencing.
But the good news is that these bills would be even higher without our renewable energy sources, which cost half as much as power from fossil fuels. Without solar power, household bills could have been 22% higher in 2024!
It’s no wonder 4 million households have already installed solar panels, saving an average of $1,500 each year. Many also add a solar battery to their setup to store even more clean energy and boost potential savings.
If you’re hoping to benefit from these solar battery savings, protect yourself from power outages, or even generate some extra cash selling excess energy, you’ll want to know how much it costs. In this guide, we explore the 15kW solar battery price and how much you could save by working with an accredited installer like Volteam.
What is a 15kW Solar Battery?
A 15kW solar battery is a high-capacity energy storage unit that holds the excess electricity (up to 15 kilowatt-hours!) your solar panels produce.
This electricity can power your entire home, from fridges to washing machines and air conditioning units. However, your panels may generate more electricity than what’s actually needed, particularly on extra sunny days. Installing a solar battery means it doesn’t go to waste.
Instead, the extra energy can be used to:
- Power your home at night
- Provide electricity during blackouts and outages
- Lower your electricity grid dependency
- Reduce power usage during peak times
- Sell energy back to the grid
Specifically,15kW batteries are best for medium-to-large homes, small to medium-sized businesses, those that rely on heavy appliances each day, and households with electric vehicles (EVs). They ensure you have a low-cost, stable power supply year-round.
Interested in installing a solar battery that holds 15kW? Volteam is the trusted choice for complete, future-ready solar solutions tailored to your home or business.
How Much Does a 15kW Solar Battery Cost with Installation?
The average price of a 15kW solar battery installed in Australia is $11,325. This covers the battery and assumes you already have a working solar system. However, costs can range from around $11,000 to $18,000, depending on factors such as:
- Solar battery brand (premium vs value-driven systems)
- Battery type (Lithium-iron phosphate is more expensive, yet best for efficiency and safety)
- Storage technology and capacity rating
- Current market demand
- Your home’s wiring and layout
- Your exact location
- Installation cost and complexity (whether or not it’s included in the price)
- Life cycle and warranty ratings
- AC/DC-coupling
- Inverter compatibility
Volteam Expert Tip: While we can provide an accurate pricing range for 15 kW solar batteries, every installation is unique. Contacting a Clean Energy Council (CEC) accredited installer can help you find the best price for your home and energy needs.
Can I Lower the Cost of Installing a 15kW Solar Battery?
Don’t panic if the upfront cost of installing a 15Kw solar battery seems out of your budget, as the Cheaper Home Batteries Program offers an immediately more affordable option.
First introduced in July 2025, this federal government initiative reduces the cost of home solar battery installation by 30%, with potential savings of around $252 per usable kWh. It applies to new battery systems with a usable capacity of 5 to 100 kWh, whether they’re connected to an existing or new solar system.
Rebates are provided in the form of Small-scale Technology Certificates (STCs), which your chosen installer trades in and applies to the value of your solar battery system. You’ll then receive this value as a discount on the battery’s upfront installation costs.
However, as of 1st May 2026, rebate amounts will decrease every six months until the program finishes in 2030. The next decrease is planned for 1st January 2027.
This means you should get your battery installed as soon as possible to maximise savings on your upfront costs, since rebates are applied from the installation date. Use our Solar Battery Rebate Calculator to quickly estimate your savings.
Another option is feed-in tariffs. Any excess electricity that your home won’t use (and therefore doesn’t need to be stored in your solar battery) can be sold back to the energy company. It’s filtered directly into the grid, and you’ll then receive a credit on your next bill.
How Much Can You Save with a 15kW Solar Battery?
The average savings you can make by installing a 15kW solar battery (with a 10kW solar system) range from approximately $1,800 to $2,800 per year. These savings come from utilising free solar energy, reducing the amount of grid electricity you use at peak times, and any feed-in tariffs you may benefit from.
It’s also a good idea to consider the return on investment (ROI) you’ll get, or payback period as it’s most commonly known in the solar world. Payback period is the number of years it takes for your energy savings to cover the initial cost of installing a solar battery. The average payback period for Australian homes with a 15kW solar battery is 4 to 7 years.
However, this figure varies based on your specific energy usage, the size of your existing solar panel system, exact location, how much power you sell back to the grid, and any qualifying state or federal rebates.
Rebates can lower payback periods by as much as 2 to 3 years, so they’re definitely worth looking into before installing a solar battery.
Best 15kW Solar Battery Deals by Brand
The best 15kW solar battery brands should be approved by the Clean Energy Council. This means they meet Australian best-practice standards set by energy network operators and other electricity stakeholder groups.
It may be tempting to choose the cheapest CEC-accredited solar battery system. However, higher-cost models often have a longer lifespan and require fewer repairs. They may also have a higher efficiency rating, better solar system compatibility, and longer warranties, all of which can maximise your long-term energy savings.
Here are our top picks that consider all of these factors:
Sungrow
Approximate Price: $9,975 (excluding installation)
Sungrow’s SBR allows you to combine multiple modules (2 to 8 per unit, with a 3.2 kWh capacity per module) to form a 15kW solar battery. This high-efficiency lithium iron phosphate battery offers up to 100% usable energy, plus its capacity can increase or decrease to meet your changing solar energy needs.
GoodWe
Approximate Price: $9,399 (excluding installation)
The GoodWe Lynx Home F Series is known for its high-voltage design, featuring a usable capacity that ranges from 6.6 to 16.4 kWh. GoodWe also have a 10-year product and performance warranty – perfect for getting the most out of your 15kW solar battery.
Sigenergy
Approximate Price: $4,500 per 8kW module (excluding installation)
Sigenergy’s flagship SigenStor can be stacked up to 6 modules (either 6 or 8kW) to create a 15kW solar battery, or one with an even higher capacity! It also comes with a pre-configured hybrid inverter and even an AI-powered Energy Management System (EMS), so you won’t need to worry about compatibility, either
Should You Invest in a 15kW Solar Battery?
15kW solar batteries are ideal for homes that use around 20 to 25 kWh of electricity per day, which is a common amount for many Aussie households. For context, an average three-person household consumes approximately 18.71 kWh daily, rising to 21.36 kWh for four people and 25.43 kWh for five people.
If your usage falls into one of these categories, a 15 kW solar battery is a solid option. They store significantly more power than 5kW units, but won’t result in wasted capacity and large expenses like 20 to 30 kW batteries, meaning they hit the solar “sweet-spot” for most homes.
Not sure whether 15kW is enough solar storage for your home or business? Contact Volteam for expert advice and to get a free solar quote today.
FAQs
How much do 15kW solar batteries cost?
15kW solar batteries can cost anywhere from $11,000 to $18,000, with the average price in Australia being $11,325. However, the exact price varies depending on the solar brand you choose, your location, battery type, your existing solar system and home layout, and installation complexity.
Can a 15kW solar battery power a house?
Yes, a 15kW solar battery will effectively power a medium-to-large home. This battery size is ideal for families with high-capacity energy needs, particularly those that require approximately 20 to 25 kWh of electricity per day.
How do I find out what size solar battery my house needs?
Find the right size solar battery for your house by calculating your average energy usage. Check previous utility bills to determine your nighttime usage in kilowatt-hours and factor in your backup needs (add an additional 2 to 5 kWh) for potential power outages. You should also use a solar battery size calculator and consult an expert solar installer like Volteam.
What are the top 15kW solar battery brands?
The top 15kW solar battery brands are those that are Clean Energy Council (CEC) accredited and offer high-efficiency modular systems with long product and performance warranties. Some of the best brands to look out for include Sungrow, GoodWe, and Sigenergy.
