You sense something is wrong before you even get up. Your phone buzzes with a solar app alert. When you check, the battery is offline. You head to the kitchen, flip the light switch, and nothing happens. The power is out.
This isn’t just a worst-case scenario. It’s a real problem that can catch Australian homeowners by surprise. If a solar panel fails, you might just see a higher bill. But if your battery fails, you could lose all power. That means you need to act quickly.
At PSC Energy, we work with solar and battery systems every day. We’ve seen homes lose power because of battery failures, sometimes from systems installed by companies that have since closed. We understand what causes these issues, what affects your warranty, and how you can protect yourself.
In this article, you’ll learn about the following:
- What Happens When a Solar Battery Fails
- How Long Does a Solar Battery Warranty Last in Australia?
- Workmanship Warranty vs Manufacturer Warranty: Who Fixes What
- What Can Void Your Solar Battery Warranty
- How Installation Quality Decides Your Warranty Outcome
- What to Look for in an Installer to Protect Yourself
- What to Do If Your Installer Has Disappeared
- FAQ: Solar Battery Failure and Warranty
By the end of this article, we’ll explain what happens if your home battery fails, who is responsible for repairs, and how to pick an installer who will support you if something goes wrong.
What Happens When a Solar Battery Fails
Battery failures can happen in different ways. Some are minor, while others are more serious. If you know what to look for, you can respond quickly.
If the battery has a minor failure, it just stops working but the rest of your system keeps running. Here’s what you might notice:
- Your solar app shows the battery offline.
- You lose your blackout protection (the feature that keeps your home running during a grid outage).
- Your solar panels still generate power during the day.
- Your grid connection still supplies power as normal.
- Your electricity bill goes up because you can’t store cheap solar power from the day to use at night anymore.
A more serious battery failure can cut power to parts of your home, or even the whole house. This is because many battery systems are wired so that mains power passes through the unit on its way to at least some of your home’s circuits.
When the battery system faults out, it shuts itself down as a safety response, and power flow through it stops. The circuits on the other side lose power. You’ll notice right away:
- Your lights go out.
- Your fridge stops humming.
- Your hot water system goes quiet.
- Your solar app shows the battery offline.
This is not a problem you can ignore. If a solar panel fails, your power bill goes up, but you can wait a week for repairs. If your battery fails and cuts power to your home, it is an emergency. You might have food in the fridge, medicine that needs to stay cold, and a hot water system that will stop working.
If you’re interested in solar batteries, you might want to check out the following article titled, Are Solar Batteries Worth It in NSW? PSC’s Ultimate Guide for 2026.
How Long Does a Solar Battery Warranty Last in Australia?
Most solar battery warranties in Australia last ten years, which is now the standard. Some brands offer even longer coverage. For example:
- Tesla Powerwall 3 carries a 10-year product warranty.
- Sigenergy SigenStor comes with a 10-year warranty as standard.
- BYD Battery-Box offers 10 years.
- Enphase IQ Battery 5P stands out with a 15-year warranty.
A ten-year warranty might sound straightforward, but the details are important. Most manufacturers set two or three limits. Your warranty covers you up to these three points:
- A set number of years, usually 10.
- A set amount of energy is pushed through the battery over its life, called throughput. Manufacturers measure this in megawatt-hours (MWh).
- A minimum capacity at the end of the warranty period, often 70% of the battery’s original storage capacity.
The first limit you reach is the one that ends your warranty. If your battery hits its throughput cap in year seven, the warranty ends then, not at year ten.
If the battery drops below the capacity minimum before ten years, you can make a claim. Ask your installer for the exact numbers for your battery and read them before signing a contract.
If you’re interested in learning a little more about battery warranties, you might want to check out the following article titled, Complete Guide to Solar Battery Warranties in Australia, 2025.
Workmanship Warranty vs Manufacturer Warranty: Who Fixes What
When a battery fails, the first question is who will pay for the repairs. The answer depends on the cause of the failure, which relates to two different warranties.
A workmanship warranty is provided by your installer. It covers faults caused by the installation itself. If the battery was wired poorly, mounted poorly, or placed in a location that violated the manufacturer’s rules, the failure traces back to the installation. Your installer is on the hook.
A manufacturer’s warranty comes from the battery brand. It covers faults in the product. If the battery unit itself is defective, the manufacturer is on the hook.
In reality, the line between these two warranties can get blurry, which is where disputes start. Before paying out, the manufacturer will send a technician to check how the battery was installed.
If they find anything wrong with the installation, they might deny your claim, even if a product defect caused the problem.
That’s why installation quality is essential. It’s the foundation of your warranty. If the installation is sloppy, the manufacturer has an easy reason to deny your claim.
If you’re interested in learning a bit more about battery warranties, you might want to check out the following article titled, Which Solar Battery Has the Best Warranty?
What Can Void Your Solar Battery Warranty
This often surprises homeowners. The list of things that can void a solar battery warranty is longer and more detailed than most people think. Manufacturers set strict rules in their warranty terms and enforce them.
Here is what can void your solar battery warranty in Australia:
- Installing the battery on an uneven surface. Most brands specify a precise horizontal tolerance.
- Letting debris, leaves, or dust build up on or around the battery.
- Pairing the battery with the wrong number of solar panels, known as an incorrect DC-to-DC ratio.
- Installing the battery in a spot that gets hotter or colder than the manufacturer allows.
- Making changes to the system without the manufacturer’s approval.
- Using parts or add-ons that are not approved or compatible with the battery.
Some of these rules might seem strict. For example, having some leaves and dust void your claim can sound unreasonable. But manufacturers include these terms for a reason, and they will enforce them if the installer gives them the opportunity.
If you’re interested in learning a bit more about the warranties for the products we install, you might want to check out the following article titled, A Complete Guide to Solar Warranties.
How Installation Quality Decides Your Warranty Outcome
The biggest factor in whether your warranty claim is approved is the quality of the original installation. If your battery is installed carefully and follows the manufacturer’s specifications, there’s little room for the manufacturer to deny your claim.
But if the installation was rushed, they have more reasons to say no.
The risk increases when a subcontractor, paid per job, does the installation. Subcontractors often work quickly because their pay depends on speed.
This doesn’t mean every subcontractor does poor work, but there’s more incentive to cut corners when they don’t have a long-term relationship with you or the main installer.
Here is what a rushed or careless installation can look like in practice:
- The installer places the battery where it suits them, not where the manufacturer allows. Sunlight rules and temperature limits get ignored.
- The installer skips a proper level check, so the mounting falls outside the manufacturer’s tolerance on day one.
- The installer does not calculate the DC-to-DC ratio correctly between panels and the battery, putting the battery under stress from the moment it switches on.
- The installer does not properly document the installation. That makes it much harder to prove compliance later if a claim is disputed.
If your battery fails and the manufacturer finds any of these problems during their inspection, they can deny your claim. You might then have to try to recover costs from the original installer, who may not be in business anymore.
If you’re interested in learning a bit more about the importance of a good installer for your solar (the most important component of any system, seriously), you might want to check out the following article titled, In-house Installers vs. Subcontractors: Which is Better?
What to Look for in an Installer to Protect Yourself
Choosing the right installer is the best way to protect yourself from a battery failure turning into a costly problem. Here’s what to look for:
- An in-house installation and service team. When the people installing your battery work directly for the company you hired, they have a much stronger incentive to do the job right. You can verify an installer’s status through the Clean Energy Council Approved Solar Retailer list.
- Clear knowledge of manufacturer specifications. Your installer should walk you through the exact installation rules for your battery model before the job starts, not after something goes wrong.
- A track record with warranty claims. Ask how they handle manufacturer warranty disputes and whether they have successfully resolved past claims.
- A physical, established local presence. A business with a real office and a real local team is far more likely to still be around when you need emergency support five years from now.
- Complete installation documentation. A professional installer will hand you a full record of the installation, including evidence that it meets the manufacturer’s specifications. This documentation is gold if you ever need to fight a claim.
If you’re interested in learning a bit more about working with a solar installer, you might want to check out the following article titled, Top Questions to Ask Your Solar Installer Before Hiring Them.
What to Do If Your Installer Has Disappeared
If your original installer has gone out of business, you still have options.
- Contact the battery manufacturer directly. Many brands run an Australian service arm and can connect you with an authorised installer.
- Call a trusted local installer for emergency help.
- Keep records of everything. Take photos of the installation, save screenshots of error messages from your solar app, and keep any warranty paperwork you have.
- Know your rights. Under the Australian Consumer Law, you may still have a claim against the manufacturer even if the installer is no longer available. For significant claims, seek independent legal advice.
If you’re interested in learning a bit more about budget plans for electricity, you might want to check out the following article titled, 10 Cheapest Electricity Providers in Sydney.
Wrapping Up: Don’t Get Left in the Dark
A solar battery failure is not like a broken microwave. It can cut power to your entire home, trigger a warranty process built around installation quality, and expose every shortcut your installer took on the day of the job.
If you want honest advice about solar battery installation in Australia, or if you’re concerned about your current system, fill out our online form and the PSC Energy team will get in touch. It’s what we do.
If you’re interested in learning a bit more about our service department at PSC, you might want to check out the following article titled, Penrith Solar Centre’s Service Department Safeguards the Future of Your System.
FAQ: Solar Battery Failure and Warranty
What happens to my home if my solar battery fails?
It depends on how bad the failure is. In smaller failures, the battery goes offline, you lose blackout protection, and you fall back on grid power and higher electricity bills. In a serious failure, the battery can cut power to your whole house. Mains power runs through the battery before it reaches your switchboard, so a major failure can completely break that flow.
Will I lose power if my home battery fails?
You might. If the failure is severe, your home could lose power from both the grid and the battery until the issue is fixed. You will usually know straight away because your solar app will show the battery offline, and your blackout protection will disappear. This is why you need an installer with real emergency service capability.
Who is responsible for fixing a solar battery failure?
It depends on why the battery failed. If the cause is an installation fault, your installer’s workmanship warranty covers the fix. If the cause is a defect in the battery itself, the manufacturer’s warranty covers it. In practice, the manufacturer will inspect the installation before honouring a claim, so the quality of the installation determines who ends up paying.
How long is a solar battery warranty in Australia?
Most solar battery warranties run for 10 years. Some brands, like Enphase, offer 15 years. Watch for the three limits inside the warranty: the time period, the total energy throughput, and the minimum capacity retention. Whichever one you hit first ends the coverage.
What can void a solar battery warranty in Australia?
More things than most homeowners expect. Common ones include installing the battery in direct sunlight, installing it on an unlevel surface, allowing debris to build up around it, pairing it with the wrong number of panels, installing it outside the manufacturer’s temperature range, making unapproved changes to the system, or using incompatible components. Ask your installer to walk you through every warranty condition for your exact battery model before you sign.
How does installation quality affect my solar battery warranty?
A lot. Manufacturers investigate the installation before they approve a warranty claim. If anything falls outside the manufacturer’s spec, they can use that to deny the claim, even when a product defect caused the failure. A careful, correct install leaves the manufacturer almost no room to say no.
What is the difference between a workmanship warranty and a manufacturer’s warranty for a solar battery?
A workmanship warranty is provided by your installer and covers installation faults such as poor wiring, improper mounting, or non-compliant placement. A manufacturer’s warranty is issued by the battery brand and covers defects in the product itself. Both matter. Knowing which one applies is the first step in sorting out a failure.
