Do Solar Panels Work During a Blackout? Here’s What You Need To Know
If you live in Far North Queensland, you already know how common blackouts can be. Between tropical storms, grid failures, and planned maintenance, it’s not unusual for homes to be left without power for hours at a time. So if you’ve invested in solar, or you’re thinking about it, it’s natural to wonder: Will my solar panels keep my lights on during a blackout?
It’s a great question, and the answer depends on a few important factors. In this blog, we’ll break it down in plain English. You’ll learn how solar power works during an outage, what systems can give you power during a blackout, and what to look for if backup energy is important to you.
Let’s get into it.
Solar Without a Battery: Grid-Tied Systems
Most homes in Cairns and regional Queensland have what’s called a grid-tied solar system. That means your solar panels are connected to the electricity grid, and the system is designed to feed power back into it. These systems are the most affordable and most common across Australia.
But here’s the catch: If the grid goes down, so does your solar.
It might sound counterintuitive. After all, the sun is still shining. Your panels are still generating power. But grid-tied systems are designed to automatically shut off during a blackout. This is a safety requirement under Australian Standards to protect utility workers who might be repairing the power lines nearby. If your system kept pumping electricity into the grid while they were working, it could be extremely dangerous.
So if your home has a standard solar setup and the power goes out, your solar shuts off too. No lights, no air con, no fridge. You’re in the same boat as everyone else.
So How Can You Keep the Power On?
If blackout protection is something you care about, you’ll need a solar battery system or a hybrid solar setup.
1. Battery Storage Systems
A solar battery stores the excess energy your panels generate during the day so you can use it at night or when the grid goes down. In a blackout, your battery kicks in and powers your home, depending on its capacity and how much energy you’re using.
Some common batteries used in homes across FNQ include:
- Tesla Powerwall
- Sungrow
- BYD
- LG Chem
These batteries are connected to your solar inverter and come with software that helps manage energy flow. Some allow for whole-home backup, while others are set up to only run essential loads like your fridge, Wi-Fi, and a few lights.
2. Hybrid Systems
A hybrid solar system is essentially a grid-connected system with a battery. It gives you the best of both worlds. When the grid is up, it can export and import power. When the grid goes down, the battery kicks in automatically. Most hybrid inverters are smart enough to switch over without you needing to do a thing.
Hybrid systems cost a bit more upfront but can provide peace of mind if you live in an area with unreliable power.
What About Off-Grid Systems?
If you’re completely off the grid, your solar system will continue working during a blackout… because your house isn’t connected to the grid in the first place. These setups are common on remote properties or farms throughout rural Queensland.
Off-grid homes rely entirely on solar panels, battery banks, and sometimes backup generators. They’re a great solution if you’re too far from the grid or want to be completely energy independent, but they do require more planning and higher upfront costs.
Can You Retrofit Blackout Protection?
Yes — in many cases, you can add a battery to an existing grid-tied solar system to give your home backup power. This is called a retrofit, and it’s becoming more popular as battery prices drop.
If your current inverter isn’t compatible with battery storage, you might need to upgrade or add a second inverter (often called an AC-coupled battery system). It’s worth having a local solar installer assess your current setup and give you options.
Just keep in mind that not all batteries are designed to provide blackout protection. Some are only made for time-of-use shifting or energy saving. If blackout protection is important to you, make sure to mention this when getting quotes.
How Long Will a Solar Battery Last in a Blackout?
This depends on a few things:
- The size of the battery
- How much energy your household uses
- What appliances are running
For example, a fully charged Tesla Powerwall 2 holds 13.5kWh of energy. If your home is using around 2kWh per hour running a fridge, lights, fans, and some devices, you might get 6 to 8 hours of power. If you’re careful and only run essentials, it could last longer.
Many hybrid systems can also recharge the battery during the day from your solar panels, even during a blackout. This means your system could run indefinitely during an extended outage — as long as the sun keeps shining.
Tips for FNQ Homeowners Worried About Blackouts
- Talk to a local solar expert. Not all systems are created equal, and blackout protection needs to be designed from the start or properly retrofitted.
- Prioritise your backup loads. Decide what’s critical in a blackout (fridge, lights, Wi-Fi, air con, etc.) so your system can be sized accordingly.
- Make sure your battery supports backup. Not all batteries provide power during a blackout. Choose one that specifically includes this feature.
- Get a system that’s cyclone-ready. In Far North Queensland, weather matters. Make sure your installer uses cyclone-rated racking and weatherproof enclosures for your gear.
Final Thoughts
While solar panels alone won’t keep your home running during a blackout, the right setup can. If blackout protection is important to you, speak to a qualified local installer about hybrid solar and battery systems that offer peace of mind when the power goes out.
At Solar NQ, we’ve been helping Far North Queensland homes and businesses get more from their solar for over 7 years. We design solar systems built for local conditions, offering honest advice, expert installs, and backup options that work when you need them most.
If you want a system that keeps the lights on, even when the grid goes down, we’re here to help.
Got more questions about solar during blackouts?
Give us a call or send us a message and we’ll be happy to walk you through your options.