Bidirectional charging: what it means for your car insurance

What is bidirectional charging?

Bidirectional charging means your electric car can not only draw power from the grid but also feed it back. The two main applications are Vehicle-to-Grid (V2G) and Vehicle-to-Home (V2H). With V2G, you connect your car to a charging station that communicates with the grid operator; your car acts as a buffer, returning power to the grid during peak times, while you charge cheaply during off-peak hours. With V2H, you use the car’s battery to power your own home: you store solar energy during the day and use it in the evening. Both technologies promise higher self-consumption of green energy and can lower your electricity bill. But they also have consequences for your car’s technology, especially the battery.

To use bidirectional charging, you need a car that supports this function, a special bidirectional wallbox, and a suitable energy contract. Communication happens via the ISO 15118 protocol. Cars with a CHAdeMO connector (such as the Nissan Leaf) or newer CCS models can handle V2G. The wallbox often has to be purchased separately and does not fall under your standard car insurance. The inverter, required to convert the battery’s DC power into AC for your home, is another extra component that poses a potential risk. It is good to know that this equipment often falls under your home buildings or contents insurance, but grey areas can emerge when damage occurs.

How V2G and V2H affect your car insurance

Your car insurance is primarily designed for using the car as a means of transport. The standard covers – third-party liability (WA), limited comprehensive (WA+), and fully comprehensive (Allrisk) – protect against damage from collisions, theft, fire and natural events, but assume normal use on public roads. When you structurally deploy the car as a home battery or a grid feed-in station, the nature of use changes. Insurers may consider this a risk aggravation, which can have consequences for coverage. Policy conditions often include a duty to report changes in use; failing to do so could lead to a claim being rejected.

• The battery: extra charge cycles lead to faster wear, which can be denied in a wear-and-tear claim.
• Liability: if you cause damage to the grid through V2G, the network operator may hold you liable. Your car insurance (WA) may not cover this specific type of damage.
• Fire: a battery fire during charging/discharging can cause both vehicle and home damage; the claims process can be complex.
• Accessories: the bidirectional charger and inverter are often not covered under the car policy, so you need separate cover.

Because the technology is relatively new, most Dutch insurers have not yet included specific V2G/V2H clauses. That does not mean you are automatically covered: if the damage results from an unreported change in use, the insurer can still deny coverage. It is advisable to notify your insurer in writing that you intend to use bidirectional charging and get written confirmation that coverage remains in force.

Is battery wear from bidirectional charging covered?

The battery of an electric car is the most expensive component; replacement can cost tens of thousands of euros. Through V2G or V2H, the battery undergoes more charge and discharge cycles than during normal driving, which shortens its lifespan. This form of degradation is almost universally regarded by car insurers as wear and tear – and wear and tear is standardly excluded from coverage. Even under a fully comprehensive policy, wear is not covered. If the battery fails prematurely, you will usually have to bear the costs yourself unless the manufacturer’s warranty still applies. Note: manufacturers may restrict V2G use in their warranty terms; for instance, intensive V2G use may void the warranty.

Another point is that in a total loss of the car – for example, due to an accident – the market value of the car is paid out, not the replacement value of a new battery. If your battery has degraded extra because of V2G, it may lower the market value, which works against you in a total loss. Therefore, it is smart when buying an EV with V2G capabilities to pay attention to depreciation and possibly take out a new-for-old arrangement that pays a higher amount in the first few years.

Fire and damage when used as a home battery

Although the risk of fire in electric cars is statistically low, a battery that is intensely used for V2H can overheat – for example due to a defect in the inverter or wiring. In such a situation, both the car and the home can suffer damage. The key question is: which insurance covers what? The car insurance covers the vehicle in case of fire, provided the fire was not caused by gross negligence or an unreported risk. But the damage to the home falls under the buildings insurance, and any smoke damage to contents under the contents insurance. The cause of the fire often determines who ultimately bears the total damage. If the fire originates in the wallbox or inverter, it can be difficult to establish whether the car or the fixed installation was the source.

To prevent problems, it is wise to have the installation carried out by a certified electrician and to document all specifications. In addition, you can rehearse a damage scenario: who do you call first? Most policies require prompt reporting and that you limit the damage. An important document is the installation report of the wallbox, which proves that the installation meets NEN 1010 standards. If your claim is unfortunately rejected, it's good to know your rights. Read our article on dealing with a rejected insurance claim so you are not left empty-handed.

What to look for in your policy terms

Since there are (as yet) no standard rules for bidirectional charging, it is essential to carefully read the fine print of your car insurance. Most policies are based on model conditions from the Dutch Association of Insurers (Verbond van Verzekeraars), but companies can differ. Pay specific attention to the following points:

• The definition of 'motor vehicle': is the car still considered as such when it is stationary and functioning as energy storage? Some policies exclude damage when the vehicle is 'not used as a means of transport'.
• Battery and battery warranty: is there a maximum number of cycles or an exclusion for 'improper use'?
• Notification duty: do you have to report a risk aggravation? For V2G/V2H, this can be seen as an aggravation, especially if you earn income from it.
• Liability coverage: is damage to the grid or third parties arising from feed-in covered? Typically, only driving-related damage is covered.
• Accessory coverage: the wallbox and inverter are often not insured, even if they are fixed in the car.

If you are unsure about the interpretation of a clause, ask your insurer in writing for clarification. You can also engage an independent adviser. Just as when you merge insurances after moving in together, adjusting your coverage for new technology is wise. For renters, contents insurance might also be affected if the home’s furnishings are involved. Consider a damage insurance check to spot any blind spots.

Practical tips for a safe V2G experience

Bidirectional charging is not a standard risk, so you need to take proactive steps to prevent problems. Start with a risk assessment and contact your insurer. Below is an overview of concrete actions.

• Check beforehand whether your car model and wallbox are certified for V2G/V2H according to the latest safety standards (e.g., CE marking and NEN 1010).
• Notify your car insurer in writing of your bidirectional charging and request written confirmation that coverage remains in force.
• Take out additional contents and buildings insurance that covers damage from a defective charging installation, if this is not standard.
• Consider a separate battery insurance if it becomes available on the market. Though rare, this could be a solution for degradation in the future.
• Keep a log of the number of charge cycles and any error messages. This can serve as evidence for a manufacturer’s warranty claim.

How insurers are preparing for the future

The insurance world is on the brink of change. With bidirectional charging still in its infancy, many insurers are waiting. But as more people embrace V2G, specific products and clauses will undoubtedly appear. Think of an 'energy use' module within the car insurance, or a separate 'home battery insurance' that covers both the car and the fixed installation. Until then, it is important to act proactively and plug the gaps in coverage yourself.

The legislator may also get involved: there are ongoing discussions about who is liable for power outages or damage caused by feed-in. The current liability rules are not written for private individuals acting as mini-power stations. So stay informed about developments through trade organisations or your insurance adviser. Finally: even though it seems like a lot of regulation, the savings on your energy bill and the contribution to a more stable grid can be worth it – provided you have properly covered the risks.