What is Bi-Directional Charging, and are we ready for V2H?

If you have been keeping an eye on the electric vehicle market recently, you’ve likely heard terms like V2H (Vehicle-to-Home) and V2G (Vehicle-to-Grid) being tossed around. Often grouped together under the banner of bi-directional charging, this technology turns your electric vehicle from a simple mode of transport into a massive, mobile home battery.

With Queensland experiencing an incredible home solar and battery boom, many local EV owners are asking: Can I use my car to power my house during peak hours or during a storm blackout? And is the technology actually ready for Hervey Bay homes today?

In this article, we'll break down how bi-directional charging works, the huge benefits it offers, and where the technology currently stands in Australia.

Understanding the Terms: V2H vs. V2G

Standard EV chargers are unidirectional—electricity flows one way, from your house or the grid into your car's battery.

Bi-directional charging allows the electricity to flow both ways. This unlocks two main capabilities:

• Vehicle-to-Home (V2H): This allows your car’s battery to supply power directly to your home's switchboard. You can charge your car using free solar energy during the day, and then use that electricity to run your lights, air conditioning, and appliances at night when grid electricity is at its most expensive.

• Vehicle-to-Grid (V2G): This takes it a step further. Instead of just powering your own house, V2G allows your car to export power back into the mains grid. Energy providers may even pay you a premium to dump electricity back into the grid during times of extreme peak demand.

Why an EV is the Ultimate Home Battery Backup

Think of it this way: a standard, high-quality residential home battery usually holds between 10 kWh and 15 kWh of electricity.

By comparison, even a standard entry-level electric vehicle typically has a battery capacity of 50 kWh to 60 kWh, while larger SUVs and electric Utes can pack 75 kWh to 100+ kWh.

That means your car has the electrical capacity of 4 to 8 standard home batteries combined. For a household in the Wide Bay region, a fully charged EV could easily keep your house running smoothly for several days if a severe weather event causes a major grid blackout.

Is Bi-Directional Charging Approved in Queensland Yet?

The short answer is: We are right on the cusp of it becoming mainstream.

For a long time, Australia lagged behind due to strict grid compliance regulations. However, Standards Australia recently updated the rules (AS/NZS 4777.2), which officially clears the pathway for bi-directional chargers to be safely connected to the Australian energy grid.

To make V2H a reality in your garage, three pieces of the puzzle need to align:

1. A Compatible Vehicle

Not all EVs can send power backward. Currently, vehicles using the CHAdeMO plug system (like the Nissan LEAF) have supported this for years. However, the industry standard has shifted heavily to CCS plugs. Newer CCS-enabled vehicles (like the Mitsubishi Outlander PHEV, Cupra Born, and upcoming models from Kia, Hyundai, and BYD) are progressively rolling out bi-directional software capabilities via over-the-air updates.

2. An Approved Bi-Directional Charger

You cannot use a standard wall box for V2H. You need a specialised, bi-directional charger capable of converting the DC power stored in your car’s battery back into the AC power your home uses. Manufacturers are currently working through the approval processes to get these units listed on the Clean Energy Council (CEC) approved register for use in Queensland.

3. Network Approval (Ergon & Energex)

Just like setting up solar panels, your local distribution network provider (Ergon Energy in regional Queensland or Energex in SEQ) must approve the connection of a bi-directional inverter to ensure it won’t disrupt the safety or stability of the local power grid.

How Can You Prepare Your Home Today?

While we wait for a wider range of approved bi-directional hardware to land on the Australian market, there are smart steps you can take right now to future-proof your setup:

• Invest in a Smart Charger Today: If you need a charger right now, opting for an intelligent, solar-aware charger like the myenergi Zappi or Evnex is the smartest move. While they are unidirectional, they maximise your current savings by ensuring 100% of your excess daytime solar goes straight into your car, rather than being wasted back to the grid for a low feed-in tariff.

• Assess Your Switchboard: When we install an EV charger at your property, we look at your entire electrical ecosystem. If you intend to upgrade to a V2H system in the coming years, having a modern, clean switchboard with adequate room for smart meters and changeover switches will save you significant installation costs down the road.

The Bottom Line

Vehicle-to-Home technology is set to revolutionise how Queenslanders think about energy independence. It effectively eliminates the need to buy a separate, expensive home battery system by utilising the massive asset already sitting in your driveway.

At Blackfin Power Systems, we stay at the absolute forefront of EV charging technology. If you are looking to install a safe, future-ready charging solution for your home or business in Hervey Bay and the Wide Bay region, reach out to our team of licensed local electricians today.