Mistakes, Warranties and Official Help
Home battery warranties and the Australian Consumer Law: years, throughput, capacity and your guarantees
How home battery warranties work in Australia — years, throughput and retained capacity limits, workmanship warranties — and the ACL consumer guarantees that apply on top.
A home battery usually comes with a manufacturer's warranty limited by years (often 10), energy throughput (the total MWh the battery can deliver while covered) and a retained-capacity guarantee (the share of original capacity it should still hold at the end), plus a separate installer workmanship warranty. Whatever those documents say, the Australian Consumer Law (ACL) gives you consumer guarantees that the battery is of acceptable quality, fit for purpose and matches its description, and that installation services are done with due care and skill. These guarantees cannot be excluded and last for a reasonable time, which for an expensive battery can be longer than the written warranty. For a major failure you can choose a refund or replacement; for a minor failure the business can choose to repair.
For the complaint process, see where to get help.
Reading a battery warranty
| Term | What it means | What to compare |
|---|---|---|
| Warranty period | Years from installation (or manufacture) | 10 years is common; check when it starts |
| Throughput limit | Warranty ends early once the battery has delivered a set amount of energy | Higher MWh is better; compare with your daily cycling |
| Retained capacity | Minimum share of usable capacity guaranteed at end of warranty | For example 60% or 70%; higher is better |
| Operating conditions | Temperature, installation location, internet connection, firmware | Whether outdoor or garage installation affects cover |
| Registration | Some warranties require registration or online monitoring | Who registers it and by when |
| Claim process | Through installer, manufacturer or both | Who pays for labour and transport |
| Transferability | Whether a new owner keeps cover if you sell | Important if you may move |
| Workmanship warranty | Installer's cover for installation faults | Years, and whether it survives the installer's business closing |
Checking throughput against your use
Illustrative example: a 13.5 kWh battery with a 10-year warranty and an assumed throughput limit of 37 MWh.
- If the battery cycles fully every day: 13.5 kWh × 365 = 4.9 MWh a year, so 37 MWh is reached in about 7.5 years, before the 10 years end.
- If it delivers an average of 9 kWh a day: 9 × 365 = 3.3 MWh a year, so 37 MWh lasts about 11 years, longer than the warranty.
Joining a VPP adds cycles, so throughput can be used faster. The CER's VPP page suggests checking how discharge rates could affect your warranty. See virtual power plants explained.
Consumer guarantees under the ACL
The consumer guarantees are in Part 3-2, Division 1 of the ACL. For goods and services bought by a consumer, they include:
| Guarantee | Example for a battery |
|---|---|
| Acceptable quality | Free from defects, safe, durable for its price and type |
| Fit for any disclosed purpose | If you said you needed backup for the fridge and lights, it must do that |
| Matches description | Usable capacity and power as stated |
| Express warranties honoured | The written warranty must be honoured |
| Services with due care and skill | Installation done competently |
| Services fit for purpose and within a reasonable time | Installed and commissioned within the agreed or a reasonable time |
Major and minor failures
| Failure type | Examples | Your remedy |
|---|---|---|
| Major | Battery is unsafe; would not have been bought if you'd known; substantially unfit and can't be fixed in reasonable time | Choose refund or replacement (goods), or cancel and get a refund (services), plus compensation for reasonably foreseeable loss |
| Minor | A fault that can be fixed in a reasonable time | Business chooses repair, replacement or refund; if they refuse or take too long, you can get it fixed elsewhere and claim costs |
The seller is your first point of contact. Manufacturers also have obligations to consumers for some guarantees, which matters if the installer has closed.
Warranty against defects documents
When a business gives a written warranty against defects, the Competition and Consumer Regulations 2010 (reg 90) require it to include prescribed wording stating that the goods come with guarantees that cannot be excluded under the ACL and that the warranty is in addition to other rights. If a battery warranty says something like "no refunds" or "warranty is your only remedy", that is misleading.
What can void a battery warranty
Common conditions that can limit cover — check your own document:
- Installation by someone other than an accredited installer
- Installation outside the manufacturer's temperature or location requirements
- Lack of internet connection where monitoring is required for warranty
- Unapproved modifications or third-party control without the manufacturer's agreement
- Physical damage, flooding or pests
A manufacturer may only rely on these where they are genuinely relevant; consumer guarantees still apply to defects that are not caused by the excluded conditions.
Recalls and safety
The ACCC's Product Safety Australia website lists product recalls, including batteries and solar equipment. Register your battery with the manufacturer so you are contacted if a recall happens, and check recalls before buying. See battery safety and location.
Steps when a battery fails
- Note the fault: error codes, app screenshots, dates.
- Contact the seller in writing, referring to the consumer guarantees and the warranty.
- If the seller has closed, contact the manufacturer directly.
- If you get no reasonable response, contact your fair trading agency and consider a tribunal claim.
- Do not attempt repairs yourself; batteries and their wiring must be handled by licensed, accredited people.
FAQ
How long do consumer guarantees last for a battery?
The ACL does not set a fixed period. It is a reasonable time based on the type of product, price and how it was used. For a battery costing many thousands of dollars, a consumer could reasonably expect it to last a long time; tribunals decide case by case.
Do I have to pay for an extended warranty?
No one has to buy an extended warranty. Before you do, compare what it adds to the rights you already have under the consumer guarantees.
Who pays labour for a warranty replacement?
Check the warranty terms. Under the consumer guarantees, reasonable costs of returning or removing goods for a remedy may be recoverable from the business.
Sources
- ACCC — consumer guarantees, warranties against defects
- Product Safety Australia — recalls
- Federal Register of Legislation — ACL (Schedule 2, Competition and Consumer Act 2010); Competition and Consumer Regulations 2010, reg 90
- Clean Energy Regulator — VPP and warranty tips
