Portable EV chargers
Portable EV chargers are Mode 2 charging units with an in-cable control box that let an electric vehicle charge from an existing socket, without wiring a fixed charging point. Select by plug on the supply side (domestic Schuko, CEE 16 A or CEE 32 A three phase, usually with interchangeable adapters), by adjustable current from 6 to 32 A, by single or three phase operation, and by cable length, IP rating and integrated protection. Units from Fronius, Victron Energy and Zencar, with a fixed wallbox as the alternative. Guide
The chargers are designed for easy charging at home or on the go by plugging into standard household outlets, eliminating the need for complicated installations. With different power levels and safety features, these chargers provide efficient charging.
What is a portable EV charger
By portable car charger, we can think of a device that charges an electric car directly from the electrical outlets we have at home. Often, in this context, there is a misunderstanding of the difference between a portable car charger and a charging cable. A portable car charger is, therefore, a separate functional unit that you use to recharge your electric car by plugging it into a socket. A charging cable, on the other hand, is used for plugging into a wallbox or when charging from public charging stations.
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Related charging categories
- Fronius portable EV chargers
- Victron Energy portable EV chargers
- Zencar portable EV chargers
- Wallbox
- Charging cables
- Electromobility
Portable EV chargers: Mode 2, plugs and current limiting
A portable charger is a complete Mode 2 charging device: a supply plug, an in-cable control box (the ICCB, sometimes called the control and protection device) and a Type 2 connector for the vehicle. The control box is what makes it a charger rather than a lead. It signals the available current to the car over the control pilot, closes the contactor only when the vehicle confirms it is connected and ready, and opens it again on any fault. That is the difference between a portable charger and a plain charging cable, which carries no electronics and only works between a car and a wallbox or a public charging station.
What separates one unit from another is the supply plug and adapter set (domestic Schuko, CEE 16 A blue, CEE 16 A or 32 A red three phase), the adjustable current range, typically 6 to 32 A in steps, the phase count, the protection built into the control box, and the physical details: cable length, cross section, IP rating and weight. In this category you will find units from Fronius, Victron Energy and Zencar.
FROM THE FIELD
"On an old house I never start at the maximum setting. I plug in at 8 or 10 A, charge for twenty minutes and then put a hand on the plug and on the socket. If either is more than mildly warm, the socket, not the charger, is the problem. That single check has stopped more scorched sockets than any datasheet ever will."
Ladislav Proc · EV charging specialist, ONSA Plus
How to choose a portable EV charger
Buy for the worst socket you expect to use, not the best one. A portable charger spends its life plugged into installations you did not design and cannot inspect: a garage at a relative's house, a workshop, a campsite pillar, a farm building. The unit has to protect that circuit as well as the car.
Work through it in this order: which sockets you will actually meet, then current limiting and phase count, then the protection inside the control box, then cable length, cross section and IP rating, and finally the honest question of whether a fixed wallbox is the better answer for daily charging at home.
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Mode 2 and what the in-cable control box does
IEC 61851 defines the charging modes. Mode 2 is charging from a standard socket with protection and control built into the cable assembly; Mode 3 is a fixed AC charging point such as a wallbox; Mode 4 is DC fast charging. In Mode 2 the control box is the whole safety system, because the socket behind it offers nothing beyond an ordinary breaker.
- Control pilot signalling: a PWM signal on the CP line tells the car the maximum current it may draw. Change the setting on the box and the car follows it, usually within a few seconds.
- Contactor switching: mains voltage reaches the Type 2 connector only after the vehicle has confirmed the state of the connection. An unplugged connector is dead.
- Self test: most units run an internal check of the residual current detection and the contactor at every start, and refuse to charge if it fails.
- Fault handling: earth fault, overcurrent, overtemperature, undervoltage or a broken protective earth all stop the session and are shown on the display or the status LEDs.
Schuko, CEE 16 A and red three phase
The supply plug decides how much power you can get and where you can plug in. Most serious units ship with an interchangeable adapter system so one charger covers several socket types.
- Schuko (CEE 7/4, domestic 230 V): available everywhere, but limited in practice to 8 to 10 A continuous, roughly 1.8 to 2.3 kW. Domestic sockets are rated for short peaks, not for hours at full load.
- CEE 16 A single phase (blue camping socket): a properly rated industrial connection giving about 3.7 kW. Common on campsites, in workshops and on farm buildings.
- CEE 16 A three phase (red): about 11 kW where the vehicle accepts three phases. The usual choice for a portable unit used as a semi-permanent home solution.
- CEE 32 A three phase (red): up to 22 kW, useful only if the car has a 22 kW on-board charger and the circuit genuinely supports it.
Tip from practice
Never extend a portable charger with a domestic extension lead or a cable drum. A coiled drum cannot dissipate heat and a thin lead drops voltage and heats the contacts. If you need more reach, buy the charger with a longer cable, or have a properly rated CEE socket fitted using correct electrical installation material.
Adjustable current limiting and why it matters
Current limiting is the single most useful feature on a portable charger. The setting, commonly 6, 8, 10, 13, 16, 20, 25 and 32 A, tells the car the ceiling it must respect. On an old domestic circuit that ceiling protects the weakest part of the chain: aluminium conductors, aged screw terminals, a shared radial feeding several rooms, or a socket that has been re-wired twice since 1985. A Mode 2 session is a continuous full-load draw for six to ten hours, which no ordinary household appliance imposes.
The practical rule is to stay at or below 8 to 10 A on any domestic Schuko socket of unknown age, and to raise the setting only on a circuit an electrician has checked. Lower current also keeps the total house load under the main breaker when a heat pump, an oven or a boiler runs at the same time, which is the usual reason a charging session ends with a tripped breaker rather than a full battery.
Single or three phase and realistic charging times
Power follows from voltage, current and phase count, and the slower of two limits always wins: the charger setting or the car's on-board charger. A vehicle with a single-phase on-board charger will take one phase from a three-phase supply and nothing you set will change that.
- Schuko at 10 A: about 2.3 kW, roughly 10 to 15 km of range per hour. A 60 kWh battery from 20 to 80 % takes well over 15 hours.
- CEE 16 A single phase: about 3.7 kW, the same 60 kWh battery from 20 to 80 % in roughly 10 hours. Comfortable overnight charging.
- CEE 16 A three phase: about 11 kW, the same charge in around 3.5 hours, if the car accepts three phases.
- Charging losses: add 10 to 15 % to any calculation. Losses are proportionally worst at low current, because the vehicle's own electronics run throughout the session.
Integrated protection: RCD, 6 mA DC detection and temperature monitoring
A Mode 2 charger has to bring its own protection because the socket circuit was never designed for this duty. Three functions matter and should be stated explicitly in the datasheet.
- Residual current detection: the box detects AC earth fault current, usually at 30 mA, and disconnects. It works alongside, not instead of, the RCD in the distribution board.
- 6 mA DC leakage detection: required because a vehicle's on-board rectifier can inject smooth DC residual current that blinds an ordinary type A RCD. Integrated 6 mA DC detection is what allows a type A device upstream instead of a far more expensive type B.
- Plug temperature monitoring: a sensor in the supply plug watches contact temperature and reduces the current or stops the session when the socket overheats. On worn domestic sockets this is the function that prevents fire, and it is the main reason not to buy an unbranded unit.
- Earth and polarity checks: the box refuses to start on a missing protective earth or a wiring fault, which on an old installation is a genuine and common finding.
Cable length, cross section and IP rating
Cable length is a compromise. Five metres suits a garage, seven to ten metres covers awkward parking, but a longer cable means more voltage drop, more weight and a bigger bag. Check the conductor cross section against the rated current rather than trusting the length alone. For the enclosure, look for at least IP54 on the control box and IP44 or better on the connectors if the unit will ever be used outdoors or left on wet ground, along with the stated operating temperature range for winter use.
When a portable unit is enough and when to fit a wallbox
A portable charger is the right answer for travel, for occasional charging at work or at relatives, as a backup kept in the boot, and as a first solution before a fixed installation is built. It is the wrong answer as the permanent daily charging point for a household that drives a lot: there is no dedicated circuit, no load management, no photovoltaic surplus control, no RFID or billing, and every session competes with the rest of the house for the main fuse. If the car charges at home most nights, fit a wallbox on its own protected circuit and keep the portable unit for the road.
Quick portable charger comparison
| Property | What to compare | What it affects |
|---|---|---|
| Supply plug | Schuko, CEE 16 A, CEE 16 or 32 A three phase | Available power and where you can plug in |
| Adapters | Fixed plug or interchangeable adapter set | How many socket types one charger covers |
| Current setting | 6 to 32 A, number of steps | Safety on old circuits, tripped breakers, charging time |
| Phases | Single phase or three phase | Real charging speed, capped by the on-board charger |
| Protection | 30 mA residual current, 6 mA DC detection, plug temperature sensor | Upstream RCD type required, protection of worn sockets |
| Physical | Cable length and cross section, IP rating, weight | Reach, outdoor use, voltage drop, everyday handling |
Swipe the table to the left
Frequently asked questions about portable EV chargers
What is the difference between a portable charger and a charging cable?
A portable charger is a complete Mode 2 device with an in-cable control box that switches, communicates and protects, so it works from an ordinary socket. A charging cable has no electronics and only connects a car to a wallbox or a public charging station.
Can I charge an electric car from a normal household socket?
Yes, with a Mode 2 portable charger, but keep the current setting at 8 to 10 A on a domestic Schuko socket. That gives roughly 1.8 to 2.3 kW. Household sockets and their wiring are not designed for many hours of continuous full load.
Why does a portable charger have adjustable current?
Because it is plugged into circuits nobody has inspected. Lowering the setting protects aged sockets, thin conductors and shared radials, and keeps total house load under the main breaker. The control box signals the limit to the car over the control pilot and the car obeys it.
How long does charging from a portable charger take?
Divide the energy needed by the real power. A 60 kWh battery from 20 to 80 % takes over 15 hours at 2.3 kW from a Schuko socket, about 10 hours at 3.7 kW from CEE 16 A, and around 3.5 hours at 11 kW three phase.
Do I need an RCD if the charger has one built in?
Yes. The residual current detection inside the control box supplements the installation, it does not replace it. The usual arrangement is an RCD type A in the distribution board plus 6 mA DC leakage detection in the charger, which together cover DC fault currents.
What is 6 mA DC detection for?
A vehicle's on-board rectifier can inject smooth DC residual current, which saturates and blinds an ordinary type A RCD. Detection of 6 mA DC inside the charger trips the session before that happens, so an expensive type B RCD upstream is not needed.
Why does the plug get warm during charging?
Contact resistance in the socket generates heat under a continuous load, and worn or loose contacts make it worse. Quality units monitor plug temperature and cut the current automatically. If the plug is hot, stop, lower the current setting and have the socket checked.
Can I use a portable charger with an extension lead?
No. Domestic extension leads and cable drums are not rated for hours of continuous full load, a coiled drum cannot dissipate its heat, and the extra contacts add resistance and voltage drop. Choose a charger with a longer cable or have a proper CEE socket installed.
Is a three-phase portable charger worth it?
Only if the car has a three-phase on-board charger and you have access to red CEE sockets. A single-phase vehicle draws one phase regardless and charges at the same speed. Where both conditions hold, CEE 16 A three phase gives about 11 kW.
Should I buy a portable charger or a wallbox for home?
Buy a wallbox if the car charges at home most nights: it has its own protected circuit, load management, photovoltaic surplus charging and access control. A portable charger suits travel, occasional charging elsewhere and use as a backup in the boot.
The current you can safely draw depends on the condition and rating of the socket circuit you plug into, not on the charger alone.
About ONSA Plus
Why drivers and installers across Europe buy from us
ONSA Plus is a European B2B distributor of photovoltaics, battery storage, heat pumps and EV charging stations. In our own EU warehouses we keep over 1,500 products from 25+ brands, including Huawei, Solis, SolaX and Dyness.
We are not just a trading company. We design and service energy systems ourselves, so we answer questions on charging current, plug types and protection from engineering practice, not from a catalogue. You handle a warranty claim directly with us and you buy per job.
