Wallbox 11 kW or 22 kW?

Sep 8, 2022

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

Last updated: Sep 15, 20226 minutes read

You want to install a wallbox at home, but you're not sure whether you should buy a wallbox with 11 kW or 22 kW charging power?

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! 

Difference #1: Higher charging power of the 22 kW Wallbox

You can usually choose between two basic models of a wallbox:

  • 11 kW Wallbox: this Wallbox has a maximum charging capacity of 11 kWh.
  • 22 kW Wallbox: this wallbox has a maximum charging capacity of 22 kWh.

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

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

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.

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 wallbox. 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

Wallbox 11 kW

Wallbox 22 kW

Charging Time

Max. kW

Charging Time

Max. kW

6.12 hours

11 kW

6.12 hours

11 kW

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 a wallbox 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 wallboxes, 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 wallbox as it requires 32 amps at maximum charging power. Of course, you can also charge with a 22 kW 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.

 

Difference #4: A 22 kW Wallbox is Downward Compatible

A benefit of a 22 kW wallbox 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 wallbox, you are bound to the maximum charging power of 11 kW.

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

Even though charging is faster with a 22 kW wallbox, an 11 kW wallbox 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 and a wallbox with 22 kW, 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.

Germany

Wallbox 11 kW

Wallbox 22 kW

Notification

yes

yes

Approval

no

yes

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. 

Important: Check the legal classification, because there can be differences depending on the wallbox and the country.

Difference #7: An 11 kW Wallbox is Cheaper

In terms of price, the two charging stations are very close to each other. However, there is a minimal difference between the 11 kW and 22 kW wallboxes.

For instance, the go-e Charger Gemini 11 kW costs EUR 749 (RRP), whereas the go-e Charger Gemini 22 kW costs EUR 759 (RRP). The 11 kW wallbox is therefore EUR 10 cheaper. 😋

Difference #8: Eligibility of the Wallboxes

In Germany and Austria, for example, both wallboxes are eligible (as of August 2022). 

Wallbox 11 kW

Wallbox 22 kW

Eligible in Austria for private individuals in single-, two- and multi-family homes and for businesses (as a charging station not accessible to the public) via Kommunalkredit Public Consulting GmbH.

Eligible in Austria for private individuals in single-, two- and multi-family homes and for businesses (as a charging station not accessible to the public) via Kommunalkredit Public Consulting GmbH.

Eligible in Germany for companies and municipalities under the KfW programmes Grant 441 and Grant 439.

Eligible in Germany for companies and municipalities under the KfW programmes Grant 441 and Grant 439.

Eligible in Germany for private individuals via KfW grant 440 (currently no new applications possible).

 

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However, the eligibility of wallboxes depends on the country in which you want to install the wallbox. Only a few countries offer subsidies for mobile charging stations, e.g. Austria.

Important: There are differences in the eligibility of wallboxes depending on the country. So check the respective regulations.

Summary

22 kW or 11 kW Wallbox: Who needs Which?

  • For most private EV owners, 11 kW wallboxes 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 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 wallbox.
  • For entrepreneurs or employees who own a business electric car, a 22 kW wallbox 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 wallbox.

More on the topic

If you want to know more about charging stations, charging electric cars and charging accessories, then subscribe to our YouTube channel. There are exciting videos on the topic every month.


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