Guide

How to Choose a Solar Battery in Australia

Compare usable capacity, costs, rebate requirements, VPP capability, backup configuration and installer credentials before choosing a solar battery for your Australian home or small business.

Reviewed 6 September 2026

What good looks like

The right solar battery for your property is not necessarily the biggest or most advertised model. Compare the complete system and installer, including electricity-use requirements, existing solar equipment, backup expectations, budget and eligibility for available support.

Most household and business batteries are lithium-ion. For lithium-ion batteries, usable capacity is typically 5% to 10% lower than actual capacity, and efficiency loss is typically about 10% of stored energy during charging and discharging. Compare usable capacity and the complete installed system rather than nominal capacity alone.

  • Usable capacity that matches your electricity use
  • Total installed price and quote inclusions
  • Clean Energy Council accreditation and approved-product-list status
  • VPP capability where relevant
  • Backup configuration and supported circuits
  • Installer licensing and accreditation

How to choose

Start by deciding whether you want to use more solar after dark, reduce grid electricity, provide outage backup or participate in a Virtual Power Plant (VPP). Tell installers which objectives matter to you and ask them to explain the proposed capacity, inverter and configuration.

Compare usable capacity, not only nominal capacity. Ask each installer to state usable capacity clearly, because lithium-ion systems generally have a 5% to 10% difference between actual and usable capacity.

If you are grid-connected and seeking the national discount, check VPP capability. An on-grid battery system, including its inverter, needs the technical capability to participate in a VPP under the Cheaper Home Batteries Program. The inverter should be able to communicate with a VPP operator, respond to dispatch instructions and provide telemetry data.

The program began on 1 July 2025 and provides a discount of around 30% on eligible small-scale batteries between 5 kWh and 50 kWh connected to solar panels. Eligible systems must have Clean Energy Council accreditation and appear on the CEC approved products list.

In NSW, the former battery installation discount is no longer available from 1 July 2025 because it could not be combined with the national program. Check the requirements that apply to your location and confirm whether a quoted discount is already included.

The NSW Government gives an indicative installed-cost range of $6,000 to $24,000 for a residential battery. The supplied guidance says cost depends on battery size and model and the installer, so compare the total price and inclusions.

Backup power requires specific configuration, and not every system supports it. Ask which circuits will remain powered, what equipment is required and whether backup is included.

Some systems are modular and may allow capacity increases later. Confirm upgrade ability with the installer before purchase, particularly where a DC-coupled arrangement is proposed.

  • Usable capacity and total installed price
  • CEC accreditation and approved-product-list status
  • VPP capability for an on-grid system
  • Backup configuration and supported circuits
  • Installer licensing and accreditation
  • Future expansion options

The process

Review recent electricity bills and note when you use the most power, whether you already have solar, whether you want outage backup and whether major loads may be added later.

Request multiple written quotes from Solar Accreditation Australia-accredited installers. Each quote should identify usable capacity, inverter and other equipment, installation work, monitoring, rebate treatment, backup configuration and current warranty terms.

Compare like with like. Ask the installer to state how the battery will connect to your existing solar system. AC coupling is the usual arrangement when adding a battery to an existing solar system; AC and DC coupling operate differently during an outage.

Confirm how the system operates normally and during an outage, whether it can participate in a VPP and what terms apply under any VPP arrangement. In NSW, the VPP incentive can include upfront and ongoing payments, with conditions set by the provider.

Verify that the installer is accredited by Solar Accreditation Australia and holds an unrestricted electrical licence in the state or territory of installation. NSW consumers should also check for a current NSW licence. Keep the quote, product details and installation documentation.

Check the proposed battery location. Guidance says most home batteries can be installed outdoors, but a stable, cool location away from direct sun is preferable. Enclosures should be vermin-proofed, inaccessible to children and fitted with appropriate safety, warning and shutdown signs. Check insurance requirements before installation.

  • Gather bills and define your main objective.
  • Obtain multiple written quotes.
  • Compare usable capacity, inclusions and total price.
  • Confirm rebate and VPP requirements before signing.
  • Request current warranty terms in writing.
  • Verify the installer’s licence and accreditation.

Red flags

Be cautious of a quote focused on a discount or headline capacity without explaining usable capacity, installation inclusions and the final price.

For the national program, do not treat a general eligibility statement as proof. The system must meet the relevant requirements, including CEC accreditation, approved-product-list status and, for an on-grid system, VPP technical capability.

Ask the installer to confirm how the battery will work with your existing solar setup. Avoid relying on an unverified product pairing or verbal promise.

Do not proceed without checking credentials. The installer or designer must be accredited by Solar Accreditation Australia, and an installer must hold an unrestricted electrical licence in the state or territory of installation. NSW customers should verify a current licence.

A quote should clearly state whether backup power is included. Not all systems provide backup, and the battery must be configured for it.

Be cautious if the proposed location does not address access, signage, child safety, vermin protection or insurance requirements.

  • Unclear final price or missing inclusions
  • Unverified rebate or approved-product-list claims
  • No explanation of usable capacity
  • No written backup or VPP confirmation
  • Missing licence or accreditation
  • Warranty terms not provided
  • Pressure to sign before comparing quotes

When to get professional help

Professional input is important when adding a battery to existing solar, seeking outage backup or applying for a government discount. Use an accredited installer to confirm the proposed configuration, installation details and the requirements relevant to the system.

Ask for help if your electricity use is difficult to estimate or may change. Compare usable capacity, your existing solar system, VPP capability where relevant and installation work rather than relying on a simple sizing rule alone.

Use the following resources when comparing your broader solar options: compare solar panel costs in Australia, compare solar panel brands, and compare solar installers. Confirm any battery-and-inverter configuration in writing.

FAQs

Request current warranty terms in the quote and product documentation, and compare what is covered before signing. The supplied evidence does not provide model-specific warranty durations, cycle-life figures or degradation guarantees.

Frequently asked questions

What is the best solar battery for a typical Australian home?

There is no single best battery in the supplied evidence. Compare usable capacity, electricity use, backup needs, VPP capability, eligibility, total installed price, warranty terms and installer credentials.

How much does a home solar battery cost in Australia?

The NSW Government gives an indicative installed-cost range of $6,000 to $24,000. The supplied guidance says cost depends on battery size and model and the installer, so compare the total price and inclusions.

Which batteries qualify for the national battery discount?

Eligible batteries are between 5 kWh and 50 kWh, connected to solar panels, have Clean Energy Council accreditation and are listed on the CEC approved products list. An on-grid system, including its inverter, also needs VPP technical capability.

Can I add a battery to my existing solar system?

AC coupling is the usual arrangement when adding a battery to an existing solar system. Ask an accredited installer to confirm the proposed configuration and how the battery will operate with the existing system.

Will a solar battery keep my home running during a blackout?

Only if it is configured for backup, and not all systems support this function. Ask which circuits will be powered and whether backup equipment is included.

What should I check in a solar battery warranty?

Request the current warranty terms in writing and check the coverage in the product documentation and quote. The supplied evidence does not support model-specific comparisons of warranty duration, cycle life or degradation.

Important information

Editor's note: Confirm current details with a qualified professional in this field before you act.

Related guides

Sources

  • Batteries | energy.gov.auAs of 1 July 2025, the Australian Government's Cheaper Home Batteries Program provides a discount on the cost of installing a small-scale battery system for households and businesses, and eligible battery systems must have Clean Energy Council accreditation and be listed on the CEC's approved products list.
  • Batteries | energy.gov.auUnder the Cheaper Home Batteries Program, on-grid battery systems need to have virtual power plant (VPP) capability, meaning the inverter should be able to communicate with a VPP operator, respond to dispatch instructions, and provide telemetry data.
  • Solar Consumer Guide | energy.gov.auFrom 1 July 2025, the NSW battery installation discount is no longer available because it cannot be combined with the Australian Government's Cheaper Home Batteries Program discount.
  • Residential batteries | NSW Climate and Energy ActionThe cost of installing a residential battery in NSW can vary from $6,000 to $24,000 depending on battery size, model, and installer choice.
  • Residential batteries | NSW Climate and Energy ActionThe Australian Government's Cheaper Home Batteries Program provides an upfront discount of around 30% on batteries between 5 kWh to 50 kWh in size for all homeowners and businesses installing a new, eligible battery system connected to solar panels.
  • Residential batteries | NSW Climate and Energy ActionNSW Government's Virtual Power Plant Incentive is for NSW residents who already have a battery up to 28 kWh in size, want their battery to make money, and want to help keep neighbours' lights on, with incentive amounts varying and including both upfront and ongoing payments.
  • Rooftop solar installers and designers | Clean Energy RegulatorDesigners and installers must be accredited by Solar Accreditation Australia (SAA) and hold an unrestricted electrical licence in the state or territory of installation for systems to be eligible for small-scale technology certificates (STCs).
  • Rooftop solar installers and designers | Clean Energy RegulatorInstallers must ensure the Clean Energy Council list of approved products includes the PV modules and inverters installed, and components must be fully installed and commissioned before their listed expiry date.
  • Batteries | energy.gov.auMost household and business batteries are lithium-ion batteries, which have high performance, long lifetimes, and low maintenance needs, and have almost entirely replaced older lead-acid batteries in the market.
  • Batteries | energy.gov.auFor lithium-ion batteries, the difference between usable and actual capacity is small (5% to 10%), and efficiency loss when charging and discharging is typically about 10% of the stored energy.
  • Batteries | energy.gov.auA battery can provide back-up power during an outage but must be configured to do so, and not all battery systems can provide back-up power.
  • Batteries | energy.gov.auThere are two common solar and battery set-ups (AC coupling and DC coupling) which operate differently during an outage.
  • Batteries | energy.gov.auIf adding a battery to an existing solar system, AC coupling is the usual arrangement.
  • Batteries | energy.gov.auThe battery management system can be set up to provide back-up power, give the best bill savings, or participate in a virtual power plant, and may need an internet connection for VPP participation or system monitoring.
  • Section 6: Planning your solar battery system | solar.vic.gov.auSome battery systems are modular, allowing capacity increases later, but this is typically harder in a DC-coupled arrangement, and upgrade ability needs to be confirmed with the installer prior to purchase.
  • Section 6: Planning your solar battery system | solar.vic.gov.auMost home batteries can be installed outdoors, but their lifespans will be improved by a stable, cool temperature, so they should not be located in direct sun or in an uninsulated, unshaded metal shed.
  • Section 6: Planning your solar battery system | solar.vic.gov.auBattery enclosures should be vermin-proofed, cannot be accessed by children, and must display appropriate signs relating to safety, warnings and shutdown procedures.
  • Section 6: Planning your solar battery system | solar.vic.gov.auSolar panels and batteries are high value items that should be included in home insurance policies, and insurance clauses and requirements for solar battery related issues should be checked prior to installation.
How to Choose a Solar Battery in Australia | BestCompare