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What Is a Bidirectional Charger and How Does It Work?
A bidirectional charger is an EV charging unit that moves electricity in both directions, from the grid or solar system into your car's battery, and back out again to power your home or the broader grid. Standard EV chargers only work one way: they draw AC power from your switchboard, convert it to DC, and store it in the car. A bidirectional charger adds a second conversion stage, turning the car's DC battery power back into AC so it can be used by your household circuits or exported to SA Power Networks.
The conversion process itself is handled by an inverter built into the charger. When charging, it rectifies AC to DC. When discharging, it inverts DC back to AC at the correct frequency and voltage for your home. Some systems, like the Sigenergy SigenStor, integrate this inverter with solar and battery management in a single unit, which simplifies installation considerably.
For South Australian homeowners with solar, this technology opens up two genuinely useful modes: Vehicle-to-Home (V2H), where your EV acts as a large backup battery for your household, and Vehicle-to-Grid (V2G), where you export stored energy back to the grid for credits. SA's high solar penetration and some of the highest electricity prices in the country make both options worth understanding.
V2H vs V2G: Two Ways a Bidirectional Charger Can Work for You
The two main operating modes of a bidirectional charger serve different purposes, and they suit different households depending on how and when you use your car. V2H is about energy independence and bill management at home. V2G is about participating in the broader electricity market. Both are now technically possible in Australia, though they are at very different stages of commercial readiness.
Vehicle-to-Home (V2H): Your EV as a Backup Battery
V2H works by routing your EV's stored DC power through the bidirectional charger's inverter, converting it to 240V AC and feeding it directly into your home's circuits. From your household's perspective, it behaves exactly like a large home battery system. The key difference is scale: a typical home battery holds 10 to 15 kWh of usable capacity, while common EV batteries range from 40 kWh in a Nissan Leaf up to 82 kWh in a long-range Tesla Model 3. That is enough to run an average Adelaide home for two to four days without any grid input.
The practical benefits are significant. During SA grid outages, a V2H-capable setup can keep your lights, fridge and essential appliances running without a generator. On a day-to-day basis, you can charge the car overnight on a cheap off-peak tariff or from your rooftop solar during the day, then draw from the car battery during the expensive evening peak period instead of paying retail grid rates. For households on time-of-use tariffs, this alone can meaningfully reduce quarterly bills.
V2H does require that your EV supports bidirectional charging, which is a hardware feature built into the car, not just the charger. Not all EVs currently sold in Australia support it, so checking your vehicle's compatibility before investing in a bidirectional charger is essential.
Vehicle-to-Grid (V2G): Earning from the Grid
V2G takes the concept a step further by allowing your EV to export electricity directly to SA Power Networks' distribution network, not just your own home. In theory, this lets you buy cheap electricity or generate it from solar, store it in your car, and sell it back to the grid when wholesale prices spike. Dynamic tariff plans like those offered by Amber Electric for South Australian battery owners pass real-time wholesale prices through to customers, which means a V2G-capable EV could earn meaningful credits during high-demand periods.
The regulatory pathway for V2G in Australia has only recently been formalised. The updated AS4777.1 standard, published in late 2024, established the technical requirements for grid-connected bidirectional inverters, and the first V2G chargers began appearing on the Clean Energy Council approved products list in late 2025. As of 2026, V2G is technically permitted but still in early commercial rollout. Retailer support, network approval processes and compatible vehicle availability are all still catching up with the regulation. For most Adelaide homeowners right now, V2H is the more immediately practical option, but V2G is worth keeping an eye on as the market matures over the next two to three years.
Which EVs and Bidirectional Chargers Are Available in Australia Right Now?
The bidirectional charging market in Australia is moving quickly, but it is still far from mature. Before spending anything on hardware, you need to confirm that your specific vehicle and charger combination is actually compatible. The list of fully supported vehicles is shorter than most people expect.
EV Compatibility: Does Your Car Support Bidirectional Charging?
As of 2026, only a handful of vehicles sold in Australia have full manufacturer-backed bidirectional charging support. The Nissan Leaf is the most established option, using the CHAdeMO connector standard to enable V2G functionality with carmaker approval. The Mitsubishi Outlander PHEV and Mitsubishi Eclipse Cross PHEV are also confirmed compatible, with Mitsubishi actively supporting V2H use in the Australian market.
A broader group of vehicles is in trials or awaiting a software update to enable bidirectional capability. This includes the Hyundai Ioniq 5, Ioniq 6 and Ioniq 9, the Kia EV6, EV9 and EV3, and the BYD Atto 3. All of these use the CCS2 connector and are expected to gain V2G support through software once the relevant network approvals and retailer programs are in place. Timelines are not yet confirmed.
Tesla does not support bidirectional charging on any of its current models sold in Australia. There is no announced timeline for this to change. If you own a Tesla and are hoping to use your car as a home battery, a dedicated home battery system is currently your only option.
One important caution: some third-party chargers claim compatibility with vehicles that have not been officially approved for bidirectional discharge by the manufacturer. Using your EV battery in this way without manufacturer support may void your battery warranty. Always check the warranty conditions for your specific vehicle before proceeding.
Bidirectional Charger Hardware: What's on the Market in 2026
The hardware side of the market is also developing rapidly, with a small number of products now available or imminent in Australia. Costs currently range from roughly $5,000 to over $10,000 before installation, and prices are expected to fall as volume increases and competition grows.
The Sigenergy SigenStor is the standout product for households that want an integrated solution. Available in 12.5 kW and 25 kW configurations, it combines solar inverter, battery management and bidirectional EV charging in a single unit. It is CEC-listed and AS4777.2 certified, making it one of the first bidirectional chargers to meet Australian grid connection requirements. For Adelaide homeowners building a new solar and storage system from scratch, the all-in-one design simplifies both installation and ongoing management.
The Wallbox Quasar 2 is a well-established option for Nissan Leaf owners specifically. It uses the CHAdeMO connector and is one of the more proven bidirectional charger products globally, with a track record in European V2G trials. If you own a Leaf and want to get started with V2H now rather than waiting, this is the most straightforward path.
The RedEarth V2G Charger is an Australian-made option with broader vehicle compatibility, retailing at approximately $9,990 plus GST, with deliveries commencing in early 2026. RedEarth has positioned it as a more flexible solution that is not locked to a single connector standard, which may make it a better long-term bet as the CCS2-compatible vehicle list grows.
Enphase has also announced an IQ Bidirectional EV Charger, expected to arrive in the second half of 2026. Given Enphase's strong presence in the Australian solar market and its existing IQ ecosystem, this product will be worth watching closely, particularly for homes already running Enphase microinverters. Compatibility details and pricing have not yet been confirmed for the Australian market.
Is a Bidirectional Charger Worth It for South Australian Homeowners?
The honest answer is: it depends heavily on what you already own and what you are trying to achieve. For most Adelaide households right now, the numbers favour a dedicated home battery over a bidirectional charger setup. But for a specific group of homeowners, the case is genuinely compelling.
The upfront cost of a bidirectional charger alone sits between $5,000 and over $10,000 before installation. Add switchboard upgrades, which are often required to handle bidirectional power flows, and the total installed cost can push well above $15,000 in some cases. There is currently no dedicated federal rebate for bidirectional chargers. Small-scale Technology Certificates (STCs) may apply to the solar or inverter component of an integrated system like the Sigenergy SigenStor, but the charger hardware itself does not attract a specific subsidy.
The potential savings are real, though. SA households on time-of-use tariffs pay peak rates that can exceed 50 cents per kWh in the evening. If your EV battery is charged from rooftop solar during the day and discharged through a bidirectional charger during the peak period, you are effectively replacing expensive grid power with free solar energy. On a dynamic tariff plan, V2G exports during high-demand periods can also generate meaningful credits. Understanding South Australia's solar export rules is essential here, as SA Power Networks applies flexible export limits to distributed energy resources including V2G-capable systems.
The key trade-offs are worth being direct about. Using your EV battery as a home battery adds charge cycles beyond normal driving use, which accelerates battery degradation over time. Most EV manufacturers factor some level of V2H use into their battery warranties, but the specifics vary and are worth reading carefully. There is also the practical issue of availability: your car cannot power your home while you are driving it. If your household has only one vehicle and it is regularly away during peak evening hours, the V2H benefit is significantly reduced.
Compared to residential battery storage in Adelaide, a bidirectional charger setup offers far more raw capacity at a potentially lower cost per kWh of storage, but with more complexity and less reliability as a dedicated backup solution. A purpose-built home battery is always available, always charged to the level you set, and carries no risk of leaving you without a car. For a detailed look at the best solar battery options for SA homes, including how leading products compare on capacity, warranty and price, that comparison covers the dedicated battery market thoroughly.
The sweet spot for a bidirectional charger in 2026 is a South Australian homeowner who already has a compatible EV, already has solar panels, and is looking to extract more value from both assets without buying a separate battery. For that household, the incremental cost of adding a bidirectional charger is much easier to justify. For everyone else, a dedicated home battery remains the more practical and predictable near-term choice, with bidirectional charging worth revisiting as vehicle compatibility broadens and hardware costs fall over the next two to three years.
Getting Started with Bidirectional Charging in Adelaide
If bidirectional charging sounds like the right fit for your household, there are a few practical steps to work through before committing to any hardware. Start by confirming your EV is on the supported list. As covered above, only a handful of vehicles currently have full manufacturer-backed bidirectional support in Australia, and using an unsupported vehicle risks voiding your battery warranty. Next, check your existing solar setup and switchboard. Many older switchboards need an upgrade to handle bidirectional power flows safely, and that cost should be factored into your budget from the outset.
It is also worth having an honest conversation about whether a dedicated home battery might serve you better right now. For households without a compatible EV, or where the car is regularly away during peak hours, a purpose-built battery system offers more predictable performance and a simpler installation. The two technologies are not mutually exclusive, and the right answer depends on your specific situation.
The Best Solar & Batteries team can advise on the full picture, from your existing solar panels and inverter through to battery storage options and emerging EV charging technology. To talk through your options in person, visit your nearest Adelaide showroom and one of our team members can assess your setup and give you a clear, no-obligation recommendation. You can also contact us online to request a quote or ask any questions about your home energy system.
Frequently Asked Questions
What is V2G technology?
V2G (Vehicle-to-Grid) technology is a system that lets an electric vehicle send stored electricity back to the public grid via a bidirectional charger. In South Australia, this is now permitted under the updated AS4777.1 standard published in late 2024. EV owners on dynamic tariff plans can potentially earn credits by exporting during high-demand periods, though V2G is still in early commercial rollout as of 2026.
What cars come with wireless charging?
Wireless EV charging (inductive charging) is a separate concept from bidirectional charging, and as of 2026 it is not yet commercially available for cars in Australia. The more relevant question for most EV owners is which vehicles support bidirectional V2H or V2G charging. Currently confirmed models in Australia include the Nissan Leaf, Nissan Ariya, Mitsubishi Outlander PHEV and the BYD Atto 3.
What company makes electric car charging stations in Australia?
Several companies supply EV chargers in Australia in 2026, including Sigenergy, RedEarth, Wallbox and NUMBAT (V2Grid Australia) for bidirectional-capable units, alongside broader EVSE suppliers. The bidirectional charger market remains small, so buyers should confirm CEC listing and AS4777.2 certification before purchasing any unit.
What EV charger has bidirectional charging capability?
The main bidirectional chargers available or imminent in Australia as of 2026 include the Sigenergy SigenStor (CEC-listed, available in 12.5 kW and 25 kW), the Wallbox Quasar 2 (CHAdeMO connector, suited to the Nissan Leaf), the RedEarth V2G charger (around $9,990 plus GST) and the forthcoming Enphase IQ Bidirectional EV Charger. Charger compatibility must always be matched to your specific EV model before purchase.
