What Happens to Your Solar When the Power Goes Out?
It’s one of the most common questions we get asked, and the answer surprises most people.
If the power goes out and you only have solar panels, your system shuts down too.
That might sound strange. You’ve got panels on the roof, the sun is shining, and yet your house goes dark. Here’s why, and how a battery completely changes the picture.
Why Solar Panels Alone Don’t Work in a Blackout
Standard grid-connected solar systems are legally required to shut down during a grid outage. This is a safety mechanism: if your panels kept sending power into the grid during a fault, it could endanger the electricians working to fix the lines.
So without a battery, solar provides zero protection during a blackout. You’re just as vulnerable as a home with no solar at all.
Australia’s Blackout Risk Is Increasing
As extreme weather events become more frequent, whether storms, heatwaves or flood damage, grid outages are becoming longer and less predictable.
In Queensland, some areas experienced outages lasting 3–5 days following recent severe storm seasons. In parts of South Australia and NSW, ageing network infrastructure has made summer outages during peak demand periods increasingly common.
For households with medical equipment, young children, elderly residents, or simply those who work from home, a multi-day blackout isn’t just inconvenient. It can be dangerous and costly.
How a Battery Solves This
A home battery with backup capability can detect a grid outage in milliseconds and automatically switch your home to island mode, disconnecting from the grid and powering your essential circuits entirely from stored energy.
With the right setup, your lights, fridge, internet, phone charging, and even your air conditioning can keep running through an outage, completely invisibly. Many households don’t even realise the grid went down until they check their system’s app.
Add solar panels and the backup becomes almost indefinite during daylight hours. As long as the sun is producing and your loads stay within the system’s limits, a solar and battery home can sustain itself through multi-day outages that leave grid-only homes completely powerless.
Not All Batteries Offer Backup
This is an important distinction. Some batteries are designed purely for bill savings and do not include backup functionality. If blackout protection matters to you, it’s essential to choose a system that explicitly supports it.
The batteries Clean Power Australia installs, including the Tesla Powerwall 3 and Sigenergy SigenStor, include full home backup as standard, with automatic switchover and whole-home protection depending on your system size.
What a Backup-Ready System Looks Like
✅ Solar panels generate power during the day ✅ Battery stores excess solar (and can charge from the grid overnight using cheap rates) ✅ During a blackout, the battery automatically isolates your home and takes over ✅ Solar continues charging the battery during the outage ✅ Your home keeps running: lights, fridge, internet, air con
For Queensland and ACT households in particular, where storm season is a genuine annual risk, this level of energy security is no longer a luxury. It’s a practical investment in your household’s resilience.
Grid outages are getting worse. The technology to make your home immune to them is available right now, and with current federal rebates of up to $6,500, it’s never been more affordable.
