Off-Grid Battery Rebate Australia: Can You Claim STCs?

Key Takeaways

• Off-grid solar batteries can claim Small-scale Technology Certificates (STCs) under the Australian Government's Cheaper Home Batteries program.
• The battery must be installed on a "lived-in dwelling," excluding structures like sheds or bore pumps.
• Properties less than 1 km from the grid must either be Virtual Power Plant (VPP) capable or prove grid connection costs exceed $30,000.
• You can claim one battery per lived-in dwelling, with specific documentation required for additional dwellings.

Yes, Off-Grid Batteries Can Claim STCs in Australia

The Australian Government's Cheaper Home Batteries program provides support for households and small businesses to reduce the cost of installing eligible small-scale solar batteries. Under this program, off-grid solar batteries can claim Small-scale Technology Certificates (STCs), which reduce the upfront cost of your system. This applies even if your property is not connected to the national electricity grid.

For a comprehensive overview of the STC scheme and how it applies to grid-connected systems, refer to our guide on the Cheaper Home Batteries rebate explained in Australia.

What is Actually Going On

The Clean Energy Regulator (CER) administers the Small-scale Renewable Energy Scheme (SRES), which generates STCs for eligible solar and battery installations. While the scheme is primarily associated with grid-connected systems, the CER has specific provisions for off-grid installations. The core principle is that the battery must serve a genuine residential purpose, and meet certain technical and installation standards.

Unlike grid-connected systems where eligibility is tied to a national metering identifier (NMI), off-grid eligibility is tied to the dwelling itself. This distinction allows for multiple claims on a single property if there are multiple lived-in dwellings.

Off-Grid Eligibility Conditions for STCs

To claim STCs for an off-grid battery system, your installation must meet several specific conditions set by the Clean Energy Regulator. These conditions ensure the system is installed safely, effectively, and for its intended purpose.

1. The Dwelling Must Be Lived In

The most fundamental rule for off-grid STC eligibility is that the solar battery must be installed on a dwelling that is lived in. This means it must be a place of residence.

• Eligible examples: A remote farmhouse, tiny home, granny flat, houseboat, or caravan.
• Ineligible examples: Structures that are not lived in, such as sheds or bore pumps, are not eligible.

2. One Battery Per Dwelling

For off-grid systems, you can claim one solar battery per dwelling on the premises. This differs from grid-connected systems, where only one battery is eligible per premises regardless of multiple dwellings.

• Additional dwellings: Additional off-grid batteries may be claimed for other lived-in dwellings at the same location, such as a tiny home, granny flat, houseboat or caravan.
• Documentation for additional dwellings: While the CER's general guidance states that solar battery owners must receive written documentation about their solar battery and installation, specific documentation for additional off-grid batteries typically includes photos of the dwelling, a map showing its location and the locations of other dwellings that have claimed, and the hull or vehicle identification number (VIN) for mobile dwellings.

3. Distance from the Grid and VPP Capability

The requirement for Virtual Power Plant (VPP) capability depends on your property's proximity to the main electricity grid.

• Properties more than 1 km from the grid: These properties don't need to be VPP-capable.
• Properties less than 1 km from the grid: These properties must either be VPP-capable, or have written evidence that the cost to connect the unit to the main grid is more than $30,000 (excluding extra costs to extend the connection). Written evidence must come from the Distribution Network Service Provider (DNSP) or another accredited service provider or equivalent.
• • For more information on VPPs and flexible exports, refer to our guide on flexible exports in South Australia.

4. General Battery Eligibility Requirements

In addition to the off-grid specific rules, your battery system must meet the general eligibility criteria for the Cheaper Home Batteries program:

• New system: The battery must be new (created within 12 months of the installation date) and not previously installed or claimed.
• PV system connection: It must be installed with either a new or existing solar PV system of no more than 100 kW.
• Capacity: The battery system must be between 5–100 kWh nominal capacity. STCs can only be claimed for the first 50 kWh of a solar battery's usable capacity.
• Single job installation: The battery must be installed in a single job, including for a group of batteries connected to operate as one unit.
• CEC approved: The battery system must be included on the Clean Energy Council (CEC) approved battery list.
• Standards compliance: It must be compliant with Australian and New Zealand standards (AS/NZS 5139:2019), and state or territory electrical safety laws.
• Accredited installer: Installation must be by a Solar Accreditation Australia (SAA) accredited installer with battery endorsement, and in accordance with SAA's technical requirements.
• Inverter VPP capability: The inverter the battery is connected to must be capable of participating in a VPP, unless the off-grid distance exemption applies. Other inverters on site, such as existing solar PV inverters, are not required to be VPP-capable.

For a detailed checklist of all general eligibility requirements, consult our guide on which batteries qualify for the Cheaper Home Batteries program.

Retention Rules for Off-Grid Batteries

Claiming STCs comes with a retention obligation. Once a battery is installed, it should remain at the property for the duration of the warranty period or the end of 2030, whichever is later. If you move a battery to another premises, it will no longer be eligible to claim STCs.

What You Can Check Yourself, and What You Cannot

As a homeowner, you can check your property's distance from the grid using online mapping tools to determine if the VPP capability or connection cost exemption applies. You can also verify if your chosen battery model is on the Clean Energy Council's approved list and ensure your installer has the necessary SAA accreditation and battery endorsement.

However, you cannot perform the installation or certification yourself. All battery installations must be carried out by a Solar Accreditation Australia (SAA) accredited installer with battery endorsement. This ensures compliance with safety standards and eligibility for STCs. Changing inverter settings related to grid protection or VPP functionality yourself is not advised, as these are typically set by accredited installers and may breach connection agreements or safety regulations.

What the Published Sources Do Not Tell You

While the Clean Energy Regulator provides clear guidelines for STC eligibility, several critical pieces of information for off-grid system planning are not available from official sources:

• Off-grid system sizing: There is no official guidance or tool to help you size an off-grid solar and battery system for your specific needs. The Bureau of Meteorology publishes Australian solar exposure as map images rather than tables, making precise irradiance figures for specific locations difficult to obtain for system design.
• Off-grid package pricing: No Australian supplier we could reach publishes comprehensive off-grid package pricing. Costs vary significantly based on location, system size, components, and installation complexity.
• General grid connection costs: While the CER specifies a $30,000 threshold for connection cost evidence, there is no general quote or comprehensive pricing list from Distribution Network Service Providers (DNSPs) for the "cost to connect the unit to the main grid" for various scenarios. This cost must be obtained directly from your DNSP or an accredited service provider.

Therefore, while STCs can reduce the cost of an off-grid battery, you will need to engage with accredited installers and DNSPs directly to get accurate sizing, pricing, and connection cost estimates for your specific off-grid project.