Bidirectional Charging (V2H): Your Car as a Home Battery

What is bidirectional charging (V2H)?

With bidirectional charging, your electric car can not only absorb electricity, but also feed it back to your home. This is called Vehicle-to-Home (V2H). Your EV battery of 40–100 kWh effectively becomes a massive home battery — many times larger than a fixed home battery of 5–15 kWh. The concept is simple: charge your car during the day with solar power and use that electricity in the evening to power your home.

V2H is becoming increasingly practical in 2026 thanks to more compatible cars, more affordable bidirectional chargers and improved EU regulations. However, there are important caveats — your car is not always at home, and the additional charge cycles affect the battery's lifespan.

Which electric cars support V2H?

Not every EV can charge bidirectionally. The car must contain specific hardware, and the manufacturer must enable V2H functionality via software. In 2026, the following models support V2H:

• Nissan Leaf/Ariya — pioneer in V2H via the CHAdeMO protocol
• Hyundai Ioniq 5/6 — V2H via CCS with 3.6 kW output
• Kia EV6/EV9 — V2H via CCS, up to 3.6 kW feed-back
• BYD Atto 3, Seal, Dolphin — V2H available in some markets
• Volkswagen ID.4/ID.5 — V2H via software update expected in 2026

Which chargers do you need?

For V2H, you need a special bidirectional charger. A standard wallbox (AC charger) only works in one direction. Bidirectional chargers operate on DC (direct current) and cost considerably more:

Please note: the bidirectional charger must be compatible with your car and your home installation. Not every combination works. Always seek advice from a certified installer.

Pros and cons of V2H

V2H has clear pros and cons compared to a fixed home battery:

• Enormous storage capacity: an EV battery of 60 kWh is 4–12x larger than an average home battery
• Dual use: your battery serves as both driving range and home storage
• Emergency power: during a power outage, your car can power the entire home for days
• Leveraging an existing investment: you have already paid for the battery as part of the car

• Car not always at home: when you drive to work, your "home battery" is gone
• Additional battery degradation: each V2H cycle counts as a charge cycle and shortens battery lifespan
• Expensive bidirectional charger: €3,000–6,000 for the charger alone
• Limited compatibility: not every car and not every charger work together

V2H vs. a fixed home battery: an honest comparison

The key question: is V2H a good alternative to a fixed home battery? That depends on your situation. Here is an honest comparison:

The conclusion is nuanced: V2H offers enormous storage capacity, but a fixed home battery is more reliable and always available. The ideal situation? Both: a home battery for daily storage and V2H as an additional buffer for peak consumption or emergency power.

Costs and payback period of V2H

The costs for a V2H installation are still considerable in 2026. The bidirectional charger costs €3,000–6,000 including installation. On top of that, your car must be compatible — and those cars are often more expensive than models without V2H support.

The payback period for V2H alone (excluding the car itself) is 8–12 years, assuming you have the car at home daily and actively use V2H. By comparison: a fixed home battery of 10 kWh has a payback period of 5–8 years and is much simpler to install.

Conclusion: V2H as a supplement, not a replacement

V2H is a promising technology that will become increasingly accessible in the coming years. But in 2026, for most households it is still not a replacement for a fixed home battery. The reasons: higher costs, dependence on car availability, limited model compatibility and additional battery degradation.

Our recommendation: invest now in a fixed home battery for daily energy storage. Once V2H chargers become cheaper and more cars support the technology, you can add V2H as a supplement. At Home Energy Solutions, we are happy to advise you on the optimal storage for your situation.