Bidirectional charging is getting more attention in the EV market. More car manufacturers are announcing models that support the technology, and the media is calling it the next big step in electric mobility. At the same time, there is a lot of confusion about what the technology can actually do today, what is still on the roadmap, and what consumers and businesses can do with it right now.
In this blog, we explain how bidirectional charging works, the different forms it takes, and where things stand, including at Peblar.
Important to know upfront
Our current Peblar chargers do not support bidirectional charging. They deliver power from the grid to the car, but not from the car back to the home or the grid.
Bidirectional charging is a technology that is still developing. The hardware standards, the vehicles that support it, the regulation, and the agreements with grid operators are not yet at the point where we can offer it reliably and safely in our chargers. Once that changes, we will look again at the possibilities for future models.
In the rest of this blog we explain how the technology works and where it is heading.
How does bidirectional charging work?
With normal charging, electricity flows in one direction: from the grid, through the charger, into the car. With bidirectional charging, the power can also flow the other way. This makes it possible to use your car as a storage battery, for example to power appliances, supply your home, or send energy back to the grid.
Technically, here is what happens. An EV battery stores direct current (DC), while the grid and most appliances run on alternating current (AC). To make the power usable in both directions, conversion has to happen somewhere.
There are two ways this is set up:
With a DC charger, the conversion happens inside the charger. The car returns DC power, and the charger converts it to AC before it is sent to the home or the grid.
With an AC charger, the conversion happens inside the car. The car converts the DC power from its battery into AC, and the charger passes it through to the home or the grid.
At the moment, only a small number of chargers and vehicles worldwide actually support bidirectional charging in practice. Some chargers have hardware that is technically capable, but the function only becomes available once the standards, certification, and regulation are in place.
Three forms of bidirectional charging
The technology is usually broken down into three applications, depending on where the power goes.
Vehicle-to-load (V2L)
With V2L, you use your car as a large power source for individual appliances. You plug the appliance directly into a dedicated socket on the car. Think of power tools on a building site, cooking on a camping trip, or running a cooler at the beach. A number of manufacturers already build V2L into their EVs. No charger is involved here; the car handles it on its own.
Vehicle-to-home (V2H)
With V2H, you use power from your car to supply your own home. This can be useful when electricity prices are high, or to complement solar panels and a home battery. You charge the car when energy is cheap or sustainably available, and use the stored energy later when prices peak.
V2H is often mentioned as one of the more practical applications for consumers, but it does require the right combination of vehicle, charger, energy management system, and home installation. That combination is not widely available for most households today.
Vehicle-to-grid (V2G)
With V2G, you send power from your car back to the electricity grid. This typically happens when the grid needs the energy, for example during peak demand at the end of the day. In return, you can receive a payment or benefit from dynamic tariffs.
V2G has the potential to contribute to grid stability and to the integration of solar and wind energy. It does require agreements with grid operators, energy suppliers, and certification of both the car and the charger. These agreements are still very much in development across most markets.
What does bidirectional charging mean for businesses?
For business applications, there are interesting prospects. A fleet of vehicles parked at the office during the day represents a meaningful amount of stored energy. That energy could in theory be used to absorb peaks in business consumption, contribute to grid balancing, or help reduce grid congestion around business parks.
As with V2H and V2G, this is largely a future scenario today. The technology is promising, but the combination of suitable vehicles, suitable chargers, energy management systems, and commercial agreements is not yet widely available.
What are the benefits for consumers?
Once bidirectional charging matures, the benefits could be significant:
saving on your energy bill by supplying your home during peak hours, earning from feed-in payments under dynamic tariffs, and using your car as a back-up during a grid outage. More broadly, it could contribute to a more stable grid and a larger role for renewable energy.
There are also things to be aware of. Every conversion from DC to AC and back uses energy. Some of what you feed back is therefore lost, and that can offset the financial gains. In addition, frequent charging and discharging can cause additional battery wear. How significant that effect is in practice depends on the vehicle and how it is used.
What do you need to benefit from it in the future?
To make use of bidirectional charging in practice, several pieces of the puzzle need to come together:
a vehicle that supports bidirectional charging, a charger that supports it, an energy management system that can intelligently decide when to charge or discharge, and clear agreements with your grid operator and energy supplier on feed-in and compensation.
For V2H, you will also need an adjustment to your home installation, so the house can be safely powered from the car, including during a grid outage.
Our view
Bidirectional charging is one of the more exciting developments in electric mobility. It can play an important role in a future where cars, homes, and the grid are far more closely connected.
At the same time, we want to be honest about where we stand today. Our current chargers do not support bidirectional charging. We are following the developments around standards, regulation, and vehicle compatibility closely, and we are looking at the role this technology could play in future Peblar models.
For now, we focus on what we deliver today: reliable AC chargers that work intelligently with solar energy, dynamic tariffs, and load balancing. These are the areas where consumers and businesses already see real benefits from smart charging.
