Understanding the 20kW Solar Battery Price in Australia — A Complete Guide by ADS Solar

As energy prices continue to rise and Australia pushes toward a greener, more sustainable future, more homeowners and businesses are turning to solar power systems with battery storage. Among the high-capacity options, the 20kW solar system with battery storage has emerged as a reliable solution for larger homes, commercial properties, and energy-intensive operations. But one question continues to come up — what is the 20kW solar battery price in Australia, and is it worth the investment?

In this comprehensive blog post, ADS Solar breaks down everything you need to know about 20kW solar battery systems in Australia, including pricing, benefits, government incentives, ROI, and why now is the best time to make the switch.

What Is a 20kW Solar Battery System?

A 20kW solar system refers to the generation capacity of the solar panels installed on your property. It typically consists of 50 to 60 high-efficiency solar panels depending on panel wattage. When combined with a solar battery storage system, the excess electricity generated during the day can be stored and used at night or during power outages.

This makes the 20kW solar battery system ideal for:

• Large households with high energy usage

• Commercial properties

• Farms and agricultural operations

• Schools or community buildings

• Businesses operating multiple electrical appliances or machinery

  
  

20kW Solar Battery Price in Australia: An Overview

The price of a 20kW solar system with battery storage in Australia can vary based on several factors, including the brand of solar panels and inverter, battery capacity, installation complexity, and location. On average, here is a general breakdown:

System Type: Estimated Price Range (AUD)

20kW Solar System (no battery) $16,000 — $25,000

20kW Solar System + 20kWh Battery $28,000 — $40,000+

20kW Solar System + 40kWh Battery $40,000 — $55,000+

These are rough estimates. At ADS Solar, we offer custom quotes tailored to your property, energy needs, and preferred battery brands.

Factors That Influence 20kW Solar Battery System Prices

1. Battery Size (Storage Capacity)

The most critical component affecting price is the size of the solar battery, usually measured in kilowatt-hours (kWh). A 20kWh battery is often recommended for a 20kW solar system but can be scaled higher depending on your energy usage and backup needs.

2. Battery Brand and Technology

Popular battery brands in Australia include Tesla Powerwall, Sungrow, LG Chem, BYD, and Alpha ESS. Lithium-ion batteries are the most widely used and offer excellent lifespan, reliability, and efficiency.

3. Solar Panel Efficiency and Brand

High-efficiency panels from SunPower, LONGi, or Jinko Solar may come at a premium but offer better performance and faster ROI.

4. Inverter Quality

Hybrid or multi-mode inverters allow seamless integration between solar panels, batteries, and the grid. Leading inverter brands include Fronius, Sungrow, and SolarEdge.

5. Installation & Location

Installation complexity, roof type, and whether you’re in Sydney, Melbourne, Brisbane, Adelaide, or regional areas also impact pricing.

Benefits of a 20kW Solar System with Battery Storage

✅ 1. Massive Energy Generation

A 20kW system can generate around 70–90 kWh per day, depending on your location and weather conditions. That’s enough to power an average small business or large home with ease.

✅ 2. Significant Reduction in Power Bills

With a solar battery, you can store excess power and use it at night, reducing grid reliance and slashing your electricity bills by up to 70–90%.

✅ 3. Energy Independence

With the right battery size, you can achieve near energy self-sufficiency, even during blackouts.

✅ 4. Environmental Impact

Installing a 20kW solar battery system helps reduce your carbon footprint by thousands of kilograms of CO₂ annually.

✅ 5. Attractive ROI and Increased Property Value

Investing in solar improves your property value and typically offers a payback period of 4–7 years, depending on usage and incentives.

Government Incentives and Rebates in Australia

One of the best parts about installing a 20kW solar battery system in Australia is the generous government incentives that can significantly reduce your upfront cost.

🌞 Small-Scale Technology Certificates (STCs)

STCs provide upfront discounts on solar systems under 100kW. For a 20kW system, the rebate can be worth $6,000 to $8,000+, depending on your location.

🌞 Solar Battery Rebates by State

• Victoria: Battery rebates of up to $2,950 are available for eligible households.

• South Australia: Subsidies under the Home Battery Scheme.

• New South Wales: Interest-free loans for solar and battery storage.

• Queensland: Potential grants or pilot programs for battery integration.

Contact ADS Solar to find out which rebates you’re eligible for — we handle the paperwork for you.

20kW Solar System with Battery: Is It Right for You?

A 20kW solar battery system is not for everyone, but it’s perfect if you:

• Have a large roof space or ground space (at least 100–130m²)

• Run a small-to-medium business

• Live off-grid or in rural/regional Australia

• Use over 80kWh of electricity per day

• Want to achieve energy independence and future-proof your property

If your energy usage is lower, a 10kW or 13.2kW solar system with battery might be more suitable. ADS Solar offers a free energy assessment to help you choose the best system for your needs.

20kW Solar System Battery Storage Options

Depending on how much backup power you need, here are common battery storage options:

🔋 20kWh Battery

• Stores about one day’s worth of power

• Ideal for overnight use

• Popular choices: Tesla Powerwall 2, Alpha ESS SMILE5, LG Chem RESU

🔋 30–40kWh Battery

• Offers 1.5 to 2 days of backup

• Ideal for businesses or homes wanting to go off-grid

• Popular choices: Sungrow SBR Series, BYD Battery Box Premium

Maintenance and Warranties

At ADS Solar, we install only Tier-1 panels and premium batteries, backed by:

• 25-year performance warranty on solar panels

• 10–15 year warranty on inverters and batteries

• Australian-based customer support

• Ongoing maintenance and monitoring services

Regular maintenance ensures your 20kW solar battery system runs at peak performance, year after year.

Real Customer Example — Business Use Case

Client: Cafe in Western SydneySystem: 20kW solar panels + 27kWh Sungrow batteryDaily Usage: 90–100kWhBill Before Solar: $2,000/monthBill After Solar: $350–$400/monthEstimated Payback: 4.5 yearsROI Over 25 Years: $200,000+

Why Choose ADS Solar for Your 20kW Solar Battery Installation?

With over a decade of experience, ADS Solar is a trusted name in solar solutions across Sydney, Melbourne, Brisbane, and Adelaide. Here’s what makes us different:

• Custom Solar Designs tailored to your energy usage

• Premium Solar Panels & Batteries at affordable prices

• CEC-Accredited Installers ensuring top-quality workmanship

• Transparent Pricing with no hidden costs

• Flexible Finance Options, including $0 upfront deals

We take care of everything — from consultation to design, installation, monitoring, and post-install support.

20kW Solar Battery System: FAQs

❓ How long will a 20kW solar battery system last?

Solar panels can last over 25 years, while batteries typically last 10 to 15 years, depending on usage and quality.

❓ How many batteries do I need for a 20kW solar system?

It depends on how much energy you want to store. You may need one large 20kWh battery or two 10kWh batteries.

❓ Can I run my home or business completely off-grid?

Yes. With the right battery capacity and solar generation, a 20kW system can make your property completely energy independent.

Final Thoughts — Is It Worth Paying the 20kW Solar Battery Price in Australia?

While the initial cost of a 20kW solar system with battery in Australia may seem high, the long-term savings, energy security, and environmental benefits make it a smart investment for those with high energy needs.

With government rebates, expert installation from ADS Solar, and access to premium solar products, now is the perfect time to invest in clean, reliable, and future-ready energy.

Get a FREE Quote for a 20kW Solar Battery System Today!

Ready to power your home or business with a high-efficiency 20kW solar system and battery? At ADS Solar, we’re here to help you save more and live sustainably.

ADS Solar — Empowering Australian Homes & Businesses with Smarter Solar Solutions