11kW or 22kW EV charger : Which One Should You Buy for Your Home?

11kw or 22kw EV charger, how to choose?

Charging your electric vehicle (EV) at home is convenient and makes driving electric easier than ever. When you are excited to get your first electric car in your life, are you still hesitating whether to install an 11kw or a 22kw EV charger at home?

Then you’ve come to the right place!

In this article, we will explain the difference and help you make the right decision.

So, let’s get started!

11kw ev charger

Difference #1: Higher charging power of the 22kw EV charger

In short, the 22kw EV charger has higher power and can charge more under the same conditions.

11 kW EV charger: this EV charger has a maximum charging capacity of 11 kWh.

22 kW EV charger: this EV charger has a maximum charging capacity of 22 kWh.

22kw ev charger

Difference #2: The Charging Time of an 11kW vs 22kW ev charger

Theoretically, a 22 kW ev charger could charge half as fast as an 11 kW ev charger.

Note, however, that there are factors that influence the charging time. The charging power of the electric car and the charging cable are two of them.

A: Charging time depends on the electric car

If your EV has a three-phase on-board charger and a maximum charging power of 11 kW, this means that you can’t charge faster even with a 22 kW ev charger. Let’s take a quick look at the Tesla Model 3.

Tesla Model 3 characteristics:

  • Battery size: 62 kWh
  • Max. AC charging power basic version: 11 kW
  • Number of phases: three-phase
  • Max. AC charging station charging current: 16 A
11kw EV charger22kw EV charger
Charging TimeMax. kWCharging TimeMax. kW
6.12 hours11kw6.12 hours11kw

B: Charging time depends on the charging cable

As already mentioned, not only the characteristics of the electric car influence the charging time, but also, for example, the charging cable.

For instance, if you have an electric car with 22 kW AC charging power and an EV charger with 22 kW charging power, but a charging cable that only allows 11 kW charging power, your electric car will only charge at 11 kW. 

Difference #3: The Required Connection Power

Before deciding on one of the ev chargers, you should check how high the connection power is available for the charging station in your house. If it is too low, there is no point in installing a 22 kW ev charger as it requires 32 amps at maximum charging power. Of course, you can also charge with a 22 kW ev charger: wall-mounted charging station at a lower output.

So don’t forget to check the maximum charging capacity of your EV and the connected load of the house before buying a Wallbox or portable EV charger.

Difference #4: A 22 kW EV charger is Downward Compatible

A benefit of a 22 kW ev charger is that you can charge at 22 kW, but you don’t necessarily have to. The charging station can also charge with a charging power of 11 kW if, for example, your EV or the electrical installation of your house does not allow more.

With an 11 kW ev charger, you are bound to the maximum charging power of 11 kW.

Difference #5: An 11 kW ev charger is Slightly More Gentle on the Battery

Even though charging is faster with a 22 kW ev charger, an 11 kW ev charger is somewhat kinder on the battery. However, the difference is hardly noticeable.

There are only clear differences between AC and DC charging stations, i.e. fast charging stations, as the charging power is higher with DC charging stations.

Difference #6: A 22 kW Wallbox is Subject to Approval in some Countries

A significant difference between a wallbox with 11 kW ev charger  and a wallbox with 22 kW EV charger, depending on the country in which the charging station is installed, can be the obligation to register and obtain approval.

In Germany, for example, you only have to notify the network operator about installing a wallbox with 11 kW, whereas a wallbox with 22 kW not only has to be reported, but also approved before it can be put into operation (as of August 2022).

If a 22 kW wallbox is not approved, for example, because the connected load of the house is too low and you may be required to increase the connected load at your own expense, you should consider buying an 11 kW wallbox.

GermanyWallbox 11 kWWallbox 22 kW
Notificationyesyes
Approvalnoyes

In Austria, for instance, a stationary wallbox must be registered at the electricity network operator by the electrician regardless of the connected load, while no registration is required for a mobile charging station (also called a smart charging cable) (as of August 2022).

According to the Federal Ministry for Climate Action, Environment, Energy, Mobility, Innovation and Technology, there are different requirements depending on the federal state as to whether charging infrastructure is subject to approval, subject to notification or exempt from approval. 

22kw EV charger

Difference #7: An 11 kW ev charger is Cheaper

The cost of electronic components and EV cable, so 11kw EV charger is cheaper than 22kw.

Summary: 22 kW or 11 kW EV charger: Who needs Which?

  • For most private EV owners, 11 kW ev chargers are sufficient. The reason for this is that most EV owners charge their cars overnight or during the day when they are at work. In this case, you have enough time to fully charge your electric car. If you still want to buy a 22 kW wallbox or portable EV charger to charge faster, you have to make sure that the conditions for this are met (e.g. connection power, charging power of the e-car, etc.). If the conditions are not met, you will not be able to charge faster with a 22 kW charger.
  • For entrepreneurs or employees who own a business electric car, a 22 kW EV wall charger makes perfect sense, as you or your employees may need to charge the car quickly at the work location or on the way to a business appointment. The charging time can be reduced by half with a 22 kW. However, it is important that the above-mentioned requirements (e.g. connection power, charging power of the e-car, etc.) are met. If the conditions are not met, you cannot charge faster with a 22 kW wll charger.