20kW Solar Battery Price in Australia: Cost Breakdown & Best Options
Solar batteries with large capacity are becoming very popular as electricity tariffs rise, with homeowners and companies alike wanting to be less dependent on public electricity supplies. The average residential electricity price was approx. $0.39/kWh according to Global Petrol Prices.
If you’re considering saving yourself from outages or making money selling your excess electricity collected from your roof, a 20 kW capacity provides impressive long-term savings benefits.
In this guide, we shall explore the costs for 20kW solar batteries for Australia and give our advice based on the attributes of these solar batteries.
How Much Does a 20kW Solar Battery Cost?
20kW solar battery prices typically range from around $18,000 to $29,000. This depends on a few factors, including:
- Battery brand
- Storage technology
- Installation complexity
- AC/DC-coupling
- Inclusion with a solar system package
- Warranty & life cycle ratings
While the base unit itself can cost $16,000 to $27,000, that doesn’t include installation and wiring ($1,500 to $3,000) or backup integration ($800 to $1,500).
What are the Benefits of 20kW Solar Batteries?
As electricity tariffs fluctuate and grid demand spikes, a 20kW battery can help combat rising costs by storing excess solar energy for use at night. Furthermore, you’ll reduce grid purchases and safeguard your home from blackouts. This storage solution enables you to increase your energy independence and maximise returns from large solar systems.
In the 2023-24 financial year, Australian households collectively consumed around 980 petajoules of energy, as per the Australian Bureau of Statistics, highlighting significant residential electricity demand that solar and battery systems can help offset.
20kW batteries can support electric vehicle charging and ensure a smooth power supply for small businesses. For consumers with energy usage of 30kWh to 50kWh, a 20kW battery is a sound investment.
What Does a 20kW Solar Battery Power?
The large storage capacity of your 20kW solar battery gives you more freedom to power your appliances without limitations.
This means you can power:
- An entire home for 8-12 hours
- Essential loads for over a day
- Small business operations overnight
- Air conditioning, heating, cooking appliances, and lighting
- EV charging
20kW solar batteries are ideal for large family homes, large properties, or businesses that want long-lasting backup energy they can rely on.
Top 20kW Solar Batteries by Brand
Let’s take a look at some of the top-performing brands you can compare for your 20kW solar storage needs.
Sungrow
The 20kW storage setup can be achieved with Sungrow’s modular system, which offers consumers high flexibility. You can combine multiple units to design a bespoke system, which is great for customers whose needs expand over time.
The 20kW Sungrow can range from $18,000 to $25,000 (including installation) and is a good choice for the highly efficient battery chemistry, 3-phase home compatibility, and impressive load-shifting and backup power.
Tesla Powerwall 3
Again, you can DIY a 20kW solar battery with two of their 13.5kWh units if you want to create your own storage solution. The single-capacity option offers less flexibility than the Sungrow option, but Tesla offers cutting-edge technology, impressive backup capabilities, a strong warranty, and intuitive app monitoring.
This is a premium solution with two units, netting you 27kWh, priced from $22,000 to $29,000 with installation, for high-quality, durable solar storage.
Alpha ESS
This is among the most popular models for $16,500 – $24,000 high-capacity types, including installation. It has a high cycle life, exceeding 6,000 cycles, as well as a good warranty. It is designed for high-performance applications in Australia and is suitable for both residential and commercial environments.
How Much Can You Save with a 20kW Solar Battery?
A solar battery for 20kW power generation has the prospective to assist you save anywhere between $1,800 and $3,200 per annum, depending on your consumption and applicable tariffs. The savings come by helping to reduce nighttime energy feed, utilising saved solar energy, minimising dependency on energy for businesses, and avoiding peak demand charges.
Alongside a large solar system at 10-15kW, you’re getting the most from your entire setup and can increase those savings even more.
The Federal Small-scale Technology Certificates (STCs) can help you reduce upfront costs. For larger batteries like the 20kW capacity, changes to the scheme mean that the first 14kWh receives more rebates, which will decrease progressively every six months until the end of the programme in 2030.
That means it’s important to act fast to make the most of the rebates before STC values decrease. It’s worth noting that your rebate is applied from the installation date, not from the date you confirm the installation.
Who Should Install a 20kW Solar Battery?
This battery size is great for large families and homes that use more than 30kWh per day. It’s also a great solution if you own an EV, since you can use stored energy to charge your car. All-electric appliance households can benefit greatly from this amount of stored energy, enabling you to effectively protect your home during blackouts.
For businesses, a 20kW solar battery can power many functions, including retail shops, cafes, restaurants, workshops, warehouses, manufacturing units, and offices with high day-to-night loads.
What’s the Best 20kW Solar Battery Option?
When you’re comparing 20kW solar batteries, look for LFP battery chemistry for high efficiency and performance, a strong 10-15-year warranty, and backup power support. Given the significant investment, you should also be able to seamlessly integrate with existing solar systems or with a new system from the ground up.
Scalable, modular designs are great for those with expanding energy needs and a flexible approach to adding green electricity over time. Getting local support and service from a trusted installer like Volteam can help ensure you get the most from your 20kW solar battery.
When you go solar, you’re not just making a one-off purchase. It’s essential to work with professionals who can help you maximise your energy efficiency and make smart energy choices. Contact us today for a free quote on your 20kW solar battery installation.
