A lot of Australians bought electric vehicles (EVs) over the past couple of years with one idea in mind: the car could double as a home battery.
Manufacturers started advertising vehicle-to-home (V2H) and vehicle-to-grid capability. Owners of cars like the Kia EV6, Hyundai Ioniq 5, and BYD Atto 3 quickly realised that those batteries hold far more energy than most residential storage systems.
Then reality hit. The car might be capable. The house often isn’t.
Bidirectional charging depends on more than the vehicle. The charger, switchboard, wiring configuration, and sometimes even the local network all need to support it. In many homes, the real bottleneck is sitting inside the garage switchboard.
Before calling an electrician, homeowners can run a quick audit to see whether their garage is even close to being bidirectional-ready.
Why the garage suddenly matters in 2026
Until recently, vehicle-to-grid technology (V2G) in Australia mostly existed in pilot programs.
That’s starting to change. Standards have evolved, manufacturers are releasing compatible hardware, and energy companies are exploring ways EV batteries can support the grid.
It makes sense. A typical EV battery stores between 50 and 80 kWh of energy. Many home batteries are closer to 10–15 kWh. Even a modest EV can hold several days of household electricity.
In theory, that battery could power your home overnight, provide blackout backup, or export electricity during peak demand.
But none of that happens if the rest of the system can’t support it. For most households, the missing piece isn’t the car. It’s the garage infrastructure.
AC chargers vs bidirectional chargers: the difference most people miss
Nearly every home EV charger installed in Australia today works the same way.
Electricity flows in one direction.
The standard home charger
Most garages have a 7 kW AC wall charger connected to a dedicated circuit.
Here’s how that setup works:
- Electricity flows from the grid into the charger
- The charger sends AC power to the car
- The car converts that power into DC using its onboard electronics
It’s simple and reliable. But it only works one way. The charger cannot send electricity back to the house.
So even if the EV battery is capable of exporting power, the system installed in the garage usually isn’t.
Bidirectional chargers
Bidirectional systems allow electricity to flow both ways.
Instead of only charging the car, they can:
- supply energy to the home (vehicle-to-home)
- export electricity to the grid (vehicle-to-grid)
- provide backup power during outages
Most of these systems use DC charging hardware, which handles power conversion outside the car. That allows energy to move in either direction.
Products like the Wallbox Quasar 2, RedEarth’s bidirectional system, and other emerging chargers are designed with this capability in mind. Some can move around 10–12 kW of power, which is enough to run large parts of a household.
The technology exists. What varies is whether the house can support it.
The five-minute garage audit
Homeowners don’t need to be electricians to spot potential limitations. A quick look at the garage setup can reveal whether the house is likely to need upgrades.
Check the switchboard rating
Open the switchboard and find the main breaker.
Most Australian homes fall into one of these ranges:
- 63 amp main breaker
- 80 amp or 100 amp in newer homes
Higher-power chargers place a significant load on the electrical system. If the board is already close to capacity, adding bidirectional hardware may require an upgrade.
Even if the board can technically support it, installers often need spare space for additional protection devices.
Check whether the house is single-phase or three-phase
This is one of the most common limitations.
Older Australian homes are usually single-phase. Newer houses or larger properties sometimes have three-phase power.
Why this matters:
- Single-phase homes typically support charging speeds around 7 kW
- Three-phase homes can support higher-power charging equipment
Bidirectional systems don’t always require three-phase power, but having it makes the setup far more flexible.
Look at the charger already installed
Many homeowners assume their charger is future-ready.
In reality, most installed units are basic AC chargers.
If the charger documentation does not explicitly mention V2H, V2G, or bidirectional capability, it almost certainly cannot export power.
That doesn’t mean the house isn’t compatible. It simply means the charger would need to be replaced.
Check the charging connector type
Australia has largely standardised on CCS2 connectors for modern EVs.
Older Japanese EVs used CHAdeMO, which historically supported bidirectional charging earlier.
The good news is that newer standards now allow bidirectional capability on both systems. What matters more is whether the vehicle manufacturer enables the feature.
Look for energy monitoring equipment
Bidirectional systems rarely operate alone.
Most installations include additional hardware such as:
- energy meters
- smart monitoring systems
- home energy management software
These components coordinate how electricity flows between solar panels, the house, the EV battery, and the grid.
Without that control layer, exporting power safely becomes difficult.
When the car is ready, but the house isn’t
This is becoming a common situation for EV owners.
The vehicle supports bidirectional charging. The charger installed in the garage doesn’t.
Or the charger supports it, but the switchboard needs upgrading. In other cases, the home wiring limits how much power can safely flow through the system.
There can also be network requirements. Exporting electricity to the grid often requires approval from the local electricity distributor.
None of these issues are deal-breakers. They simply mean the garage needs some work before the EV battery can become part of the home energy system.
What the future garage looks like
The garage is slowly turning into an energy hub.
A typical setup later this decade could include:
In that setup, the EV becomes another storage device in the system.
Instead of sitting idle overnight, the car battery can support the house during peak energy prices. In a blackout, it can provide temporary backup power.
The technology isn’t fully mainstream yet. But it’s moving quickly in that direction.
The takeaway
Buying a bidirectional-ready EV was only the first step. The next question is whether the garage can keep up.
A quick check of the switchboard, wiring phase, and charger type can reveal whether your home is already close to being ready or whether upgrades are needed before bidirectional charging becomes possible.
Because the future of EV energy doesn’t start in the driveway. It starts in the switchboard.
Energy Matters has been in the solar industry since 2005 and has helped over 40,000 Australian households in their journey to energy independence.
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