Choose a portable EV charger by starting with the sockets you will use. Then check the car’s AC limit. Adjustable current, the correct plug and sound protection matter more than the largest number printed on the case.
Start with the sockets you have
Write down where you expect to charge. Check each socket rather than guessing from a photo. A household socket, blue CEE socket and red CEE socket offer very different supplies.
| Socket | Typical supply | Approximate power |
|---|---|---|
| Household socket, illustrative 10 A | 230 V, one phase | 2.3 kW |
| Blue CEE 16 A | 230 V, one phase | 3.7 kW |
| Red CEE 16 A | 400 V, three phase | 11 kW |
| Red CEE 32 A | 400 V, three phase | 22 kW |
A 22 kW charger cannot create three-phase power from a household socket. It also cannot make an 11 kW car accept 22 kW. Match the purchase to the weakest part of the complete chain.
Check the car’s AC charging limit
Find “AC charging power” or “onboard charger” in the car’s specifications. This is separate from its DC rapid-charging figure.
An 11 kW three-phase car is a good match for a red CEE 16 A charger. A single-phase car may use only one phase of that supply and charge more slowly. Some vehicles accept lower AC power even when the socket and portable charger can offer more.
Buying extra capacity can make sense for a future car. It adds no speed today. Do not pay for 22 kW unless the cable, plugs and protection are also rated for 32 A three-phase use.
Choose adjustable current
An adjustable charger lets you reduce the current for a weaker circuit. Useful steps include 6 A, 8 A, 10 A, 13 A and 16 A on single-phase equipment. Three-phase models may also offer settings up to 32 A.
The setting must never exceed the socket, adapter, circuit, cable or car limit. If the instructions and local rules permit 10 A, the input is about 2.3 kW. This worked example is not a universal safe-current guarantee.
The setting is a ceiling
The car decides how much current to draw below the limit offered by the charger. A 16 A setting does not force 16 A into a car that requests less.
Inspect the protective features
For Mode 2 charging, the box in the cable is an IC-CPD. It controls the charging connection and disconnects the supply when specified faults occur. IEC 62752 covers these devices.
Look for a clear maker, model, electrical ratings and conformity information. The documentation should explain residual-current protection, DC fault handling, temperature monitoring, earthing checks and fault codes. Do not treat a marketplace logo or a vague “CE approved” claim as the full evidence.
Ask the seller which protection remains active with each manufacturer-listed supply-side connection. Use it only where the charger instructions and local rules permit the complete setup. A simple travel adapter is not suitable for this job.
Measure the cable route
Park the car both ways if that is realistic. Measure from the socket to the vehicle inlet along a safe cable path. Leave enough slack to reach without pulling on either connector.
Longer is not always better. Extra cable costs more, weighs more and needs more storage. Measure the real route with the car parked in each normal position. Choose from that parking geometry, not a generic length rule.
Check outdoor suitability
Read the maker’s allowed operating conditions. The IP rating describes protection against dust and water, but the complete instructions still matter. Keep connectors out of standing water. Do not leave the control box where a vehicle can crush it.
Cold, direct sun and cable stiffness can affect daily use. A clear display is useful, but it should not replace visible status lights and readable fault information.
Decide whether portable is really right
A portable charger is useful for travel, rented homes and several known sockets. It can also be the main home charger when the circuit is suitable.
A wallbox is often better when you plug in every day. It stays mounted, keeps the cable tidy and may support dynamic load management, access control or solar charging. Compare the total installation, not only the device price.
The honest default is simple: buy the lowest power that covers your normal driving, with adjustable current and documented protection. Use only complete supply-side connections listed for that charger model and permitted by local rules.
Frequently asked questions
Is an 11 kW portable charger enough?
It can cover a large overnight energy need. The car must accept 11 kW AC and the socket must provide three phases at 16 A for you to reach that power.
Will a powerful charger damage a slower car?
No, when the equipment is compliant and compatible. The charger tells the car how much current is available, and the car draws no more than it can accept.
Should I buy a charger with adapters?
Only for socket types you expect to use. The complete connection must be listed by the charger maker and permitted by local rules. Its documentation must state the current limit and protective behavior.
Is a portable charger better than a wallbox?
It is better when mobility and several socket options matter. A wallbox is usually tidier for daily use and can offer load management, access control and solar integration.
Sources and standards
- IEC 62752:2024 — In-cable control and protection devices for Mode 2 charging
- IEC 61851-1:2017 — Electric vehicle conductive charging system
- IEC 60309-2 — Industrial plugs and socket-outlets
- IEC 60038:2009+A1:2021 — Standard voltages
- European Commission — Infrastructure for sustainable mobility, Article 14 guidance
