It’s 9pm, the rain is sideways, and the power has just dropped out across your street. The fridge has gone quiet, the modem is dark, and the Energex app says “estimated restoration: to be advised.” Every storm season, thousands of South East Queensland households have this exact evening.
That’s the moment the solar battery vs generator question stops being theoretical. Both can keep your lights on, but at very different costs and with very different levels of safety and effort.
This guide compares the two on what matters during a Queensland storm: what starts automatically, how long it runs, what it costs to own, how safe it is, and what happens on day two and three. You’ll know which option suits your home, and when the answer is both.
Why do Queensland storms make backup power a real question?
For most Queensland homes with rooftop solar, a solar battery is the better storm backup. It starts automatically, runs silently, and recharges from the sun. A generator suits rural or acreage properties facing multi-day outages, but it needs fuel, manual operation, and strict safety precautions.
South East Queensland’s storm season runs roughly October through March, and the damage is not hypothetical. In the storms of 24 November 2025, Energex reported around 162,000 customers lost supply, with 170 km/h gusts at Bribie Island and more than two million lightning strikes. Crews were still reconnecting the worst-hit areas at the end of that week.
That restoration timeline is the detail most homeowners miss. A two-hour outage is an inconvenience. A three-day outage means a lost fridge of food, no fans in 30-degree humidity, and no internet for work. So the real question isn’t whether you need backup. It’s which option fits a suburban Brisbane, Ipswich or Gold Coast home, and whether it still works on night three.
[IMAGE 2: Placement: after the paragraph above. Photo of a Queensland street after a storm with fallen branches and a dark house. ALT: “Storm damage and power outage in South East Queensland street”]
What happens to your solar system when the grid goes down?
Here is the thing most people with solar panels don’t find out until the first blackout: standard grid-connected solar switches itself off when the grid fails. Your inverter must do this under Australian anti-islanding rules so it can’t push power into lines Energex crews are working on. Panels on the roof, sun in the sky, and still no power at the kettle.
A solar battery with backup mode changes that. When the grid drops, the hybrid inverter isolates your home, switches selected circuits to battery power, and keeps running, usually in a fraction of a second. Once the sun comes up, the panels recharge the battery while the grid is still down.
A generator doesn’t fix the solar problem. It adds a separate fuel-powered supply that you connect to appliances directly, or to the house through a changeover switch fitted by a licensed electrician, and your solar stays off until the grid returns. If you already have panels, our guide on adding a battery to an existing solar system walks through the options.
How long will a solar battery keep your home running?
It depends on two numbers: your battery’s usable capacity in kWh, and how much load you put on it. A battery asked to run the whole house, including the air conditioner, pool pump and electric hot water, will drain in a few hours. The same battery backing up only the essentials will usually make it through the night.
That’s why we recommend partial backup for most SEQ homes: the fridge and freezer, lighting, modem and router, a few kitchen power points, and ideally one small split-system for the bedroom. Everything else waits for the grid. We cover how to choose those circuits in our full vs partial home backup guide.
On day two, the battery’s advantage shows up. If the storm clears, your panels recharge it during daylight and you repeat the cycle. If the sky stays grey for days, as it did during Cyclone Alfred, charging slows and you’ll need to ration loads. That’s the one scenario where a generator still earns its keep.
Is a generator safe to run during a Queensland storm?
It can be, but the rules are stricter than most people expect. Queensland’s Electrical Safety Office publishes clear do’s and don’ts for running generators, and three of them matter most during a storm.
First, never run a generator indoors, in a garage, or under a carport near a door or window. Petrol and diesel generators produce carbon monoxide, which you can’t see or smell. The generator belongs outside, on a dry surface, under an open canopy that keeps rain off without trapping exhaust.
Second, never plug a generator into a wall outlet to “backfeed” the house. It can electrocute the Energex crew working on your street and bypasses every safety device in your switchboard. If you want generator power through house wiring, a licensed electrician must install a changeover switch.
Third, there’s fuel. You’ll refuel every several hours, letting the unit cool each time, and store petrol in labelled safety containers away from the house. After a major storm, servos in the affected area often have no power to run their pumps, so a generator is only as useful as the fuel you stored beforehand.
None of this applies to a solar battery. It sits on the garage wall, makes no noise, produces no fumes, and switches over on its own at 2am while you sleep.
Which costs more over ten years?
Pricing for both changes month to month, so we’d rather give you a current quote than a stale number. What decides the ten-year picture is how the cost structure differs.
A solar battery carries a higher upfront cost but almost no running cost. It works every day, storing the solar you’d otherwise export for a few cents and using it in the evening peak instead. That daily saving is where the payback comes from, and the storm backup is effectively free on top. Eligible households can also cut the upfront cost through the federal rebate, explained in our Queensland solar battery rebates guide.
A generator is cheaper to buy but costs money every hour it runs. Fuel, oil changes, servicing by run hours and parts all add up. For a unit that runs a few days a year the running cost stays modest, but a generator delivers zero value on the 360 days the grid is working.
If you want a battery that cuts bills as well as covering storms, our solar battery installation services in Brisbane page explains the brands we install and how we size for backup. Request a free assessment and we’ll model your actual usage before recommending anything.
Solar battery vs generator: how do they compare side by side?
| Factor | Solar battery (with backup mode) | Petrol or diesel generator |
| Starts during a blackout | Automatically, in a fraction of a second | Manual start, then plug in appliances or switch over |
| Runtime | Limited by kWh capacity and load; recharges from solar by day | As long as you have fuel; typically needs refuelling every several hours |
| Works on grey, rainy days | Yes, but recharging slows | Yes, unaffected by weather |
| Noise | Silent | Loud, often 60 to 90 dB at close range |
| Fumes and carbon monoxide | None | Yes; must run outdoors, away from windows and doors |
| Maintenance | Minimal; software updates and occasional checks | Oil, filters, fuel stabiliser, servicing by run hours |
| Everyday value | Daily bill savings from stored solar | None outside outages |
| Who connects it | CEC-accredited installer, once | Licensed electrician for a changeover switch; otherwise extension leads |
| Best suited to | Suburban SEQ homes with rooftop solar | Acreage and regional properties with multi-day outages |
Can you use a solar battery and a generator together?
Yes, and for some properties it’s the right answer. Several hybrid inverters include a generator input that lets a generator top up the battery or carry heavy loads during an extended outage, while the battery handles the overnight essentials and the instant switchover. You get the silence and automation of a battery most of the time, and fuel-powered insurance when the clouds don’t lift for days.
This combination makes the most sense on acreage around Scenic Rim, Lockyer Valley and the Moreton Bay and Sunshine Coast hinterlands, where restoration after a cyclone can take longer than in metropolitan Brisbane. On a suburban block, a correctly sized battery alone covers the realistic scenarios.
One caution. The generator still lives outdoors with every precaution above, and your installer must wire the generator input so the two supplies can never feed the grid at once. Done properly it’s robust. Done with an extension lead through a window, it’s dangerous.
Which option is better for your Queensland home?
Most homeowners we talk to in Brisbane, Ipswich, Logan and the Gold Coast land on a battery, and the reasoning is simple. They already have solar on the roof, they want backup that works without pulling a starter cord in the rain, and they want the system to pay for itself on ordinary days.
A generator wins when outage risk is measured in days rather than hours, when there’s no solar on the roof and none planned, or when the home has heavy loads such as bore pumps that a residential battery can’t sensibly carry. It’s also the stopgap for renters who can’t install fixed equipment, though the safety rules apply just as strictly.
A growing number of rural households choose both: a battery for daily savings and instant switchover, and a generator kept fuelled for the long tail. Before deciding, our guide on using your solar battery backup switch during a blackout explains what to expect from the moment the lights go out.
[IMAGE 4: Placement: after this section. Photo of a Queensland family in a lit kitchen at night with rain visible through the window, battery visible on the garage wall through a doorway. ALT: “Queensland home running on solar battery backup during a storm blackout”]
What mistakes do Queensland homeowners make with backup power?
Assuming solar panels work in a blackout. They don’t, unless a battery with backup mode is installed. Every storm season we hear from homeowners who found this out at 9pm with a dark house and a sunny roof the next morning.
Buying a battery without backup circuits wired. Some batteries are installed for bill savings only. Confirm with your installer that backup mode is included and which circuits it covers before signing anything.
Trying to back up the whole house. A battery running the ducted air conditioner, pool pump and electric hot water will be flat before midnight. Partial backup of essential circuits is almost always the smarter design.
Running a generator in the garage with the door open. An open door does not stop carbon monoxide building up. Generators belong outdoors, away from windows, doors and vents.
Backfeeding through a power point. It endangers line crews and neighbours and can destroy the generator when the grid returns. Only a licensed electrician should connect generator power to your switchboard.
Not checking the system after the storm. Hail, debris and lightning can damage panels, isolators and inverters. Our post on what to check on your solar after a Queensland storm lists the inspection steps before you switch everything back on.
Frequently Asked Questions
Is a solar battery better than a generator for storms?
For most suburban Queensland homes with solar, yes. It starts instantly, runs silently and recharges from the sun. Generators suit multi-day rural outages.
Does a solar battery work during a power outage?
Only if it’s installed with backup (EPS) mode and backup circuits. A battery set up for bill savings alone shuts down with the grid.
How long will a solar battery last in a blackout?
Usually overnight when backing up essentials like the fridge, lights and modem. Runtime depends on capacity, loads and whether solar can recharge it by day.
Can a solar battery run an air conditioner during an outage?
A small split system, usually yes. Ducted systems draw too much for most residential batteries and are normally left off the backup circuits.
Can a solar battery replace a generator completely?
In metropolitan SEQ, usually yes. On acreage with outages lasting several days, a battery plus a generator is the more resilient setup.
Can I use both a generator and a solar battery?
Yes. Many hybrid inverters offer a generator input so the generator can recharge the battery or carry heavy loads during a long outage.
Does a battery provide backup automatically?
Yes, when backup mode is configured. Switchover takes a fraction of a second on most modern systems, so you may not notice the grid has dropped.
Is it safe to run a generator during a storm?
Only outdoors, under an open canopy, away from windows and doors, and never backfed through a power point. Carbon monoxide is the main risk.
Which is cheaper to run, a battery or a generator?
A battery has almost no running cost and saves money daily. A generator costs fuel and servicing every hour it runs and earns nothing when the grid is up.
Do I need a licensed electrician for a generator?
Yes, if it connects to your house wiring. A licensed electrician must install a changeover switch to the Wiring Rules and Energex requirements.
Conclusion
When you weigh a solar battery vs generator for Queensland storms, it comes down to three things. A battery with backup mode starts on its own, makes no noise or fumes, and pays for itself on ordinary days by storing your solar. A generator runs as long as you can keep it fuelled, which matters on acreage where restoration takes days, but it demands manual operation and strict safety practice. For many rural homes, the strongest answer is a battery for the everyday and a generator for the long tail.
The November 2025 storms were a reminder that multi-night outages are part of living in South East Queensland. Whichever option you choose, choose it before the next season, not during it.
Ready to find out what backup power would look like for your home? Contact SolarThoughts for a free solar battery assessment. Our CEC-accredited team designs partial-backup battery systems for Brisbane, Ipswich, Logan, Gold Coast and Sunshine Coast homes, and we’ll tell you plainly if a generator belongs in your plan too.
