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Generator or Home Battery for Northern Rivers Blackouts? Fuel, Noise, Switch-Over, Safety and Whole-Home Backup Compared, With a Calculator
Checked and updated by our licensed electricians: October 2026
After the 2022 floods and ex-Tropical Cyclone Alfred in 2025, nearly every Northern Rivers household has thought about backup power, and the choice comes down to two things: a petrol or diesel generator in the shed, or a home battery wired for whole-home backup. We install batteries, so you would expect us to say battery; what we will actually say is that the right answer depends on how long you need to run, what you need to run, whether your roof can recharge a battery, and whether anyone at your place wants to fuel and start a generator at 2am in the rain. This guide compares the two honestly on fuel, noise, maintenance, switch-over time, safety, the connection rules and what each can run, with the outage history that makes it a real question here. The calculator at the top turns your own outage plan into litres of petrol on one side and kilowatt-hours of battery on the other. No prices: they change, and we quote a battery after seeing your bills and your switchboard.
On this page: The calculator: what would get you through? · Why this is the Northern Rivers question · How each one keeps the lights on · Side by side: the honest comparison · The rules: changeover switches, never a power point · Carbon monoxide, fuel and noise · What a whole-home backup battery does in an outage · The best of both: battery plus generator · Storm-season checklist · Questions we get asked
What would get you through an outage? Calculator
Five taps: what you want to keep running, how long an outage you plan for, your solar, whether someone can always run a generator, and your neighbours. The result shows on screen straight away, with the generator route and the battery route side by side in real numbers; sending it to your phone is optional.
Why this is the Northern Rivers question
Two events decide what “a blackout” means here. In February and March 2022 Essential Energy’s Lismore depot was completely submerged, the Lismore South and Murwillumbah zone substations and the Lismore CBD went under, crews reached parts of the network by drone and helicopter, 69,603 customers lost power across the two floods, and the network was only fully available to reconnect just before Easter. In March 2025, ex-Tropical Cyclone Alfred cut power to 84,000 homes and businesses from Tweed Heads to Grafton and west to Armidale; Essential Energy’s count peaked at about 42,600 on 8 March, was still 5,200 on 11 March, and hinterland pockets such as Eureka and Federal stayed cut off by floodwater and fallen trees after that.
So the planning case is not a two-hour fault. It is one to seven days, often with roads cut, service stations dark and the mobile network patchy, in weather that is also stopping your solar from doing its best for the first day or two. Any backup plan that assumes you can drive out for fuel, or that the sun will shine on day one, is a fair-weather plan.
How each one keeps the lights on
A generator burns petrol, diesel or LPG to spin an alternator. A portable inverter generator (1 to 7 kVA) is wheeled out, fuelled, started and either plugged into the appliances by extension lead or connected to the house through a changeover switch an electrician has fitted. A fixed standby generator sits on a slab, is wired in permanently, and an automatic transfer switch starts it 10 to 30 seconds after the grid drops. Both need fuel stored on site, oil changes, a run every month or two so they still start, and an outdoor spot away from windows.
A home battery wired for backup stores energy from your solar (or the grid) in lithium cells and has an inverter that can run the house on its own. When the grid fails, a gateway or backup switch disconnects the house from the street in milliseconds, the battery carries the load, and the solar panels keep recharging it whenever the sun is out. There is nothing to start, fuel or hear. Its limits are the energy stored (how long) and the inverter output (how much at once): a single-phase home system typically supplies about 5 to 10 kW at once, so the oven, the air conditioner and the kettle go one at a time, much as they would on a 7 kVA generator.
See it on a real job: our off-grid Mullumbimby hinterland install with a Sigenergy battery, solar and a backup generator.
Side by side: the honest comparison
| Portable generator | Fixed standby generator | Home battery with whole-home backup | |
|---|---|---|---|
| Cost structure | Lower up front; fuel, oil and servicing every year; replaced every decade or so | Higher up front plus slab, wiring and transfer switch; fuel and servicing; annual service contract typical | Highest up front, less the federal rebate; no fuel; no servicing beyond checks; works every evening of the year, not only in blackouts |
| Rebates | None | None | Federal Cheaper Home Batteries rebate (steps down 1 January and 1 July 2027) and solar STCs |
| Fuel | Petrol in jerry cans, bought and rotated beforehand (stale in months); about 0.6 L per kWh | Diesel or LPG tank on site; still finite | Sunlight; the panels refill it every day the sun is out |
| Switch-over | A person, fuel, a torch, a few minutes | Typically 10 to 30 seconds, automatic | Milliseconds (GoodWe under 4 ms; Sigenergy Gateway 0 ms load-side); nobody gets up |
| Noise | About 87 to 90 dB(A) sound power for good inverter units; open-frame sets louder | Enclosed, still clearly audible; sited away from bedrooms | About 30 to 35 dB(A): a quiet room |
| Maintenance | Oil changes, spark plug, air filter, a monthly run so it starts; fuel rotation | Scheduled servicing, battery for the starter, test runs | Firmware updates over the internet, visual checks |
| What it can run | Up to its rating (0.9 to 5.5 kW continuous for common inverter units); extension leads unless wired in | Sized to the house, 8 to 20 kVA common | Everything on the backup circuits, about 5 to 10 kW at once single phase; big items one at a time |
| How long | As long as the fuel lasts: about 3 to 6 hours a tank | As long as the tank lasts | Battery kWh divided by the load, then reset by every sunny day; indefinitely in good weather with a modest load |
| Safety | Carbon monoxide if run anywhere enclosed; fuel storage; backfeed risk if misconnected; hot and heavy to move in a storm | CO managed by siting; fuel storage; professionally wired | No fumes, no fuel; installed to AS/NZS 5139 position rules by licensed electricians |
| Solar in the outage | Grid-tied solar stays off | Grid-tied solar stays off | Panels keep charging the battery while the house runs |
| Best for | Occasional short outages, camping, a shed; a top-up for a battery in a long outage | Large rural loads that must run for days; no usable roof | Most homes with a roof that gets sun; anyone who wants it silent, automatic and useful all year |
The rules: changeover switches, never a power point
The single most dangerous thing people do in a blackout is plug a generator into a power point with a lead that has a plug on both ends. It pushes power back up the street into lines that workers believe are dead, it can electrocute a neighbour, and when the grid comes back it destroys the generator. It is illegal everywhere in Australia.
A generator may feed a house in two ways. Either it stays separate and you run extension leads from it to the fridge and the lights, or a licensed electrician wires in a permanent changeover switch (manual, or an automatic transfer switch for a standby set) so the switchboard is fed from the grid or the generator, never both, to the Wiring Rules AS/NZS 3000 and the generating-set standard AS/NZS 3010. The electrician also checks the generator’s earthing arrangement and which circuits it can carry. In NSW that is licensed electrical work and comes with a certificate of compliance. We do this work if you want a generator inlet alongside a battery.
A battery system has the same rule built into the hardware: the gateway isolates the home from the grid before the inverter takes over, which is what makes it legal and safe to keep the solar running. Where the battery itself may go is set by AS/NZS 5139 and the makers: where can a home battery be installed?.
Carbon monoxide, fuel and noise
- Carbon monoxide. Generator exhaust is lethal in an enclosed space, and “enclosed” includes a garage with the door open, a carport against the house and a verandah under a bedroom window. The Victorian Department of Health’s outage guidance says to run generators only in a well-ventilated outdoor area away from open windows and vents, and NT WorkSafe’s alert after two workers were hospitalised says never indoors or in semi-enclosed areas even if ventilated. A battery-powered CO alarm inside the house is cheap insurance for anyone who owns a generator.
- Fuel. Petrol stored for the storm goes stale within months (Honda suggests using it within about 30 days or adding stabiliser), so it has to be rotated through the car. Store it in approved cans away from the house, the battery and any ignition source, and never refuel a hot generator.
- Noise. Honda rates its EU70 at 90 dB(A) sound power and its small EU10 at 87; the “52 dB” in brochures is at quarter load with the eco throttle on, 7 metres away. Cheaper open-frame units are louder. The NSW noise regulation limits when power equipment, generators included, may be heard inside a neighbour’s home (check the current hours; the regulation was under review in 2026), and a week of a generator on a town block is where neighbours fall out. A battery runs at about 30 to 35 dB(A).
- Weight and weather. A 5.5 kW inverter generator weighs about 118 kg; it has to be wheeled out, kept dry but ventilated, and refuelled every few hours, in exactly the weather that caused the outage.
What a whole-home backup battery does in an outage
A typical Sun Connect Solar install backs up the whole home unless you ask us to leave something out, such as an EV charger or a pool pump. When the grid drops, the Sigenergy Gateway or the GoodWe ESA’s backup switch isolates the house in milliseconds and the battery carries every circuit; the panels keep charging it while the sun is up. Two numbers decide the experience:
- Energy (kWh) is how long you can run. A 16 kWh GoodWe or 18 kWh Sigenergy carrying the essentials (fridge, lights, wifi, fans, a pump, about half a kilowatt) lasts well over a day with no sun; the whole house as normal (about 1 kW average) lasts about 14 to 16 hours, then resets on the next sunny day.
- Power (kW) is how much you can run at once: about 5 to 10 kW for a single-phase home system, up to 22 kW through a Sigenergy single-phase Gateway on a larger system. Run the oven, the air conditioner and the kettle one at a time and nothing trips.
Work it out for your own appliances with the blackout battery runtime calculator, and read whole-home vs essential-circuits backup and blackout backup batteries for Northern Rivers homes. If you join Amber or a VPP later, remember an automation can leave the battery low before a storm: Amber Electric and VPPs with a home battery explains the reserve setting.
The best of both: battery plus generator
For hinterland and rural homes where a week without grid is realistic, the design we like most is a battery doing the everyday and the first days silently, with a generator as the long-tail top-up. The Sigenergy Gateway has a dedicated port for a generator; a unit with a two-wire (dry contact) or automatic mains failure start can be started by the system when the solar and the battery are both exhausted, and its output charges the battery rather than idling under a half-load all day, so it runs flat out for a couple of hours (where it is most efficient) and then stops. Generator output has to sit inside the inverter’s voltage and frequency window, which good inverter generators do. For a GoodWe ESA or any other battery, the same result comes from a manual changeover switch and a generator inlet the electrician fits beside the board.
This is how our off-grid Mullumbimby hinterland job works, and the thinking behind it is in off-grid batteries: days of autonomy and how off-grid solar works.
Storm-season checklist
- Battery owners: when a warning is out, set the backup reserve high (or charge to full and pause any VPP or Amber automation), check the app shows the battery full, and know which circuits are backed up.
- Generator owners: fresh fuel in approved cans, oil checked, a test start, a dry outdoor position away from every window and door, heavy-duty outdoor leads, a CO alarm indoors, and the changeover switch tested if you have one. Never a power point.
- Everyone: freeze water bottles to hold the freezer, charge power banks, know where the torch is, keep the car above half a tank, and write down Essential Energy’s outage number (13 20 80) because the website will be slow.
- Flood-prone homes: the battery and the switchboard belong above your known flood level; the generator and its fuel too. We place batteries with flood history in mind on every Lismore, Murwillumbah and Coraki job.
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Questions we get asked
Is a generator or a home battery better for blackouts?
For most Northern Rivers homes with a roof that gets sun, a home battery set up for whole-home backup is the better everyday answer: it switches over in milliseconds, runs silently, recharges from the solar every day the sun is out, and earns its keep every evening of the year. A generator wins where outages run longer than the battery and the sun can cover, where there is no usable roof, or where a very large load (a big workshop, farm pumps) must run for days. Many rural homes end up with both: the battery does the first day or two silently, and a generator tops it up through a long one.
How long will a generator run on a tank of fuel?
Honda publishes about 3.2 hours for its small EU10 (2.1 litre tank, 0.58 litres an hour at its 0.9 kW rating) and about 6.4 hours for its large EU70 (19.2 litre tank, 3 litres an hour at its 5.5 kW rating); both run longer at lighter loads with the eco throttle on. Put another way, a petrol inverter generator delivers roughly 1.6 to 1.8 kWh for every litre at rated load and less at part load, which is why our calculator uses 0.6 litres per kWh. A week of running a whole house as normal is well over 100 litres of petrol, bought and carried in jerry cans while every service station in the district is also without power or queued out.
Can I plug a generator into a power point to run the house?
No. Feeding a generator into a power point with a double-ended lead is illegal and can kill the line workers restoring the grid, electrocute a neighbour, and destroy the generator when the grid returns. A generator may only be connected to house wiring by a licensed electrician through a permanently wired changeover switch, so the house is fed from one source at a time, to the Wiring Rules (AS/NZS 3000) and the generating-set standard (AS/NZS 3010). Otherwise, run extension leads from the generator to the appliances directly.
How fast does a home battery take over when the power goes out?
Fast enough that you usually do not notice. GoodWe’s ESA datasheet gives under 4 milliseconds to switch to backup, and Sigenergy’s Gateway datasheet gives a 0 millisecond load-side disruption when the Gateway, energy controller and battery work together (about 5 milliseconds in independent testing of the SigenStor). Computers, the modem and the fridge keep running. An automatic standby generator typically needs 10 to 30 seconds to start and transfer; a portable generator needs a person, fuel, a torch and a few minutes.
Will my solar panels keep working in a blackout if I have a battery?
With a backup-capable battery system, yes. The system disconnects the house from the grid, keeps the house running from the battery, and the panels recharge the battery while the sun is up, so a sunny day after the storm resets you for the night. Ordinary grid-connected solar without a battery switches off in an outage, for the safety of the people fixing the lines.
How much noise does a generator make?
Honda rates its EU70 at a sound power of 90 dB(A) and its small EU10 at 87 dB(A); the “52 dB” in the brochures is at quarter load with the eco throttle on, measured 7 metres away. Cheaper open-frame generators are louder still. The NSW noise regulation limits when power equipment, generators included, may be heard inside a neighbour’s home, and a town block in a week-long outage is where those complaints happen. A home battery runs at about 30 to 35 dB(A), roughly a quiet room.
Can a generator and a home battery work together?
Yes, and for remote hinterland homes it is often the best design. The Sigenergy Gateway has a port for a generator; a generator with a two-wire (dry contact) or automatic mains failure start can be started automatically when the solar and the battery are both exhausted, and its output charges the battery rather than running the house directly, so it runs flat out for a few hours instead of idling all day. We have built exactly this on an off-grid Mullumbimby hinterland job. The generator still needs fuel, servicing and a safe outdoor position; the battery does the quiet work.
What happened to power in the Northern Rivers in 2022 and 2025?
In the February and March 2022 floods Essential Energy’s Lismore depot was completely submerged, the Lismore South and Murwillumbah zone substations and the Lismore CBD were inundated, 69,603 customers lost power across the two events, and the network was only fully available to reconnect just before Easter. In March 2025, ex-Tropical Cyclone Alfred cut power to 84,000 homes and businesses from Tweed Heads to Grafton, with Essential Energy’s count peaking at about 42,600 on 8 March and a few hinterland areas such as Eureka and Federal still cut off on 11 March. Those are the outages a backup plan here has to be built for: days, not hours, with fuel and roads cut too.
Does the battery rebate apply to backup generators?
No. The federal Cheaper Home Batteries rebate and the solar STCs apply to the battery and the panels; nothing public subsidises a generator. The rebate steps down for installs from 1 January 2027 and again from 1 July 2027, set by the install date. We build the rebates into every design.
Sources
Honda Australia EU10 and EU70 specification pages (output, tank, run time, fuel consumption, sound power); GoodWe ESA single-phase datasheet AU (backup switching under 4 ms, 63 A bypass, noise); Sigenergy Sigen Gateway HomePro datasheet AU (22 kW single-phase backup, 0 ms load-side disruption) and Gateway installation guidance on generator connection and automatic start; SolarQuotes Sigenergy review and “Blackouts, solar power and batteries”; Electrical Safety Office Queensland “Permanently connected generators” (licensed electrician, changeover switch, AS/NZS 3000 and AS/NZS 3010); Victorian Department of Health “Power outages: using alternative fuel and electricity generation safely” (2024); NT WorkSafe carbon monoxide safety alert; NSW Government ministerial releases on the March 2025 outages (84,000 homes and businesses) and Essential Energy counts reported 6 to 11 March 2025 (WattClarity, Lismore App); Essential Energy submission to the NSW parliamentary flood inquiry (2022: 69,603 customers, depots and substations inundated); Australian Government energy.gov.au on solar in blackouts and the Cheaper Home Batteries Program; AS/NZS 5139 as summarised by the Electrical Regulatory Authorities Council. Full list in our research note. Checked October 2026.
