Choosing a 7kW, 11kW or 22kW wallbox? Check the electrical supply, the vehicle's AC charging limit and how long it stays parked before you specify a charger.

7kW, 11kW or 22kW EV Charger: Which One Actually Makes Sense?

A 22kW wallbox looks like the obvious upgrade on a product sheet. Then the driver plugs in and sees 11kW on the dashboard. Nothing is necessarily wrong with the charger. The car may simply be taking all the AC power it can use.

This is why choosing a wallbox by its headline power alone can lead to the wrong order. Before you decide between 7kW, 11kW and 22kW, look at the building, the vehicles and the time those vehicles actually spend parked.

Start with the electrical supply

For a typical European installation, the three ratings usually correspond to different supply requirements:

These are equipment ratings, not a promise of the power every installation will deliver. An electrician still needs to check the available capacity, wiring, protective devices and local installation rules. If a building only has single-phase service, putting “22kW” on the quotation will not make three-phase power appear at the parking bay.

Then check what the car can take

An AC wallbox supplies power to the vehicle; the vehicle's onboard charger converts it for the battery. The charging rate therefore depends on both sides of the connection. A car limited to 11kW AC will not charge at 22kW just because it is plugged into a 22kW wallbox. Tesla explains the role of the onboard charger, and Renault gives a concrete example: a Renault 5 E-Tech using a 22kW three-phase AC point is listed with a maximum output of 11kW for the vehicle.

That does not make a 22kW wallbox a poor choice. At a shared parking site, it may serve other vehicles that can accept more AC power. It may also make sense when the site is being planned for a changing mix of vehicles. But for a single known car parked at home all night, more wallbox capacity may bring no noticeable benefit.

There is one more detail in a socketed installation: check the charging cable's phase and current rating too. The wallbox, cable and vehicle have to be considered together.

Match the charger to the parking routine

A car parked overnight at home: A 7kW single-phase unit is often the practical starting point, provided the electrical installation supports it. The driver usually cares more about having enough charge by morning than reaching the highest possible number on a screen.

A home or office with three-phase power: An 11kW unit is worth considering when the vehicles support three-phase AC charging and have shorter parking windows. It can be a sensible middle option without specifying 32A on every phase.

A hotel, workplace or shared car park: A 22kW unit can be useful when turnover matters, compatible vehicles are expected and the site's electrical capacity is available. For several bays, ask how much power can be used at the same time. Ten 22kW nameplates do not mean the building can supply 220kW to charging at once.

What to confirm before placing a wallbox order

If you are buying for a project or stocking chargers for your market, a short specification check can prevent a long conversation after installation:

1. Supply: What voltage, phase arrangement and usable capacity are available at the site?

2. Vehicles: What are the vehicles' AC charging limits, and are they single-phase or three-phase capable?

3. Connector and cable: Is Type 2 right for the destination vehicles? Is a tethered cable or socketed unit preferred, and what cable length is practical?

4. Access: Should anyone be able to plug in, or does the site need card access or app control?

5. Project requirements: Which protective-device configuration, documentation and smart functions are required for that exact model and destination market?

This last point matters particularly for OEM orders. Two wallboxes can look identical from the outside while having different software, cable, access-control or protection configurations. Confirm the specification against the sample and final order, rather than assuming every option is included.

At E-Mingze, we offerType 2 wall-mounted EV chargers in 7kW. 11kW and 22kW configurations, with OEM/ODM options for distributors and project buyers. If you send us the destination country, electrical supply, vehicle types and the functions you need, we can help narrow down the configuration before you request a sample.