What Is an RFID Card EV Charger? A Guide to Protecting Your Charger in a Shared Car Park
Can other people use the charger in your residential or workplace car park? We explain how an RFID card charger works, who needs one, other ways to prevent unauthorised use, and how to track consumption when several people share a charger.
You've installed a wallbox in your building's car park. A few weeks later, your electricity bill comes in higher than expected, or you head down one morning to find your charging cable plugged into someone else's car. This happens more often than people think with chargers installed in shared spaces, because a wallbox with its cable left out will, by default, charge whichever car plugs into it.
In this guide, we explain in plain terms what an RFID card charger is, how it works, who actually needs one, and what other ways there are to protect your charger from unauthorised use in a shared car park.
What is an RFID card charger?
RFID stands for Radio Frequency Identification. It is the same contactless technology you use every day in building access cards, public transport cards and hotel key cards.
With an RFID card charger, simply plugging the cable into the car isn't enough to start charging. The user has to hold a card that has been registered to the charger up to its reader. If the card is recognised, charging starts; if not, the charger doesn't supply power. In short, the RFID card works like a key to your charger.
How does it work?
Typical use of a card-enabled charger looks like this:
- Plug the cable into the car. The car and the charger are connected, but no power flows yet.
- Tap the card. The user holds the card up to the reader on the charger.
- Authorisation check. The charger checks whether the card it has read is one of its registered cards.
- Charging starts. If the card is authorised, charging begins; if not, the charger stays on standby.
These steps take a few seconds and add no noticeable hassle to everyday use. The order in which you tap the card and how cards are registered may vary by model, so always follow the instructions in your charger's user manual.
Who needs one?
Not every charger needs a card. It depends on where the charger is installed and who can get to it.
| Installation location | Risk of unauthorised use | RFID card recommendation |
|---|---|---|
| Locked private garage | Low | Usually not needed |
| Detached house, garden or open driveway | Medium | Worth considering if the charger can be reached from the street |
| Shared car park in a residential complex or apartment building | High | Recommended |
| Workplace, office or business car park | High | Recommended |
| Shared charger used by several people | Depends on the number of users | Recommended for access control and per-user tracking |
Residential complex and apartment car parks
Plenty of people pass by your charger in a shared car park: other residents, visitors, service and maintenance staff. If your charger is fed from your own meter, any energy someone else draws goes straight onto your bill. A card-enabled charger largely eliminates this risk. We cover the general steps for installing in a shared car park in detail in our guide Installing an EV Charger in an Apartment Building or Residential Complex.
Workplaces and fleets
At a charging point shared by employees or company vehicles, the real need is less about locking the charger and more about knowing who is using it. Card access ensures the charger can only be used by authorised people, while per-user reporting makes it easier to split consumption by person.
Detached houses
If the charger is inside a closed garage, a card is usually unnecessary. But if it's mounted on a garden wall within reach of the street, it's worth considering a card-enabled model, or at least a smart charger that lets you start and stop charging remotely.
Other ways to prevent unauthorised use
An RFID card isn't the only solution. There are several ways to protect your charger, and they can be combined:
- Start and stop from the mobile app: Smart chargers let you start and stop charging from your phone. Stopping the charger from the app once charging is finished is a practical way to keep the cable from being plugged into another car.
- Notifications: Notifications sent to your phone the moment charging starts or stops help you spot any unexpected use.
- Usage history: Regularly checking your charging history and energy consumption is the easiest way to see whether there's been any consumption at times when you weren't charging.
- Physical protection: Housing the charger in a lockable protective enclosure adds an extra layer against both unauthorised access and the elements.
- Don't leave the cable lying around: Hanging the cable on a holder after use is a good habit, keeping things tidy and preventing the cable from being run over.
| Method | What it does | Limitation |
|---|---|---|
| RFID card | Charging won't start without the card | The card must not be lost or shared |
| Mobile app | Remote start, stop and monitoring | The charger must be connected to the internet |
| Notifications and usage history | Spotting unexpected use | Doesn't prevent use, only makes it visible |
| Lockable protective enclosure | Restricts physical access to the charger | Requires installation and space |
Multiple users: who charged how much?
If the same charger is shared by family members, several neighbours in the same building or colleagues in an office, a second question comes up: how do you split the bill? Here, per-user reporting matters just as much as access control.
With WiseCar's wall-mounted WTA3 and WTL models, you can share the charger with up to 15 users through the WiseCar mobile app and manage their access from the app. Per-user reporting lets you see separately how much energy each user has consumed, when they charged and their usage history. You can also track charging costs by entering your electricity tariff in the app. We look at how your tariff affects charging costs in our guide EV Night-Time Electricity Tariff.
What to look for when choosing a card-enabled model
- Decide on the card option when you buy: On some models, RFID isn't a feature added later but a hardware option chosen at purchase. WiseCar WTA3 and WTL models are available with or without a card reader; you'll find the card-enabled version as a separate option on the product page.
- Remote access: Thanks to a server-based connection, WTA3 and WTL give you access from the app as long as the charger is connected to the internet, even when your phone isn't on the same Wi-Fi network or within Bluetooth range. That means you can stop charging without going down to the car park.
- Outdoor durability: Shared car parks are often semi-open spaces. WTA3 and WTL have an IP65 protection rating. You can find what to watch out for in semi-open and open areas in our article Can You Charge an Electric Car in the Rain?
- Power and phase: With or without a card, the charger's power must suit your electrical installation and the AC power your car can accept. For single-phase installations, the WTL 7.4 kW Single-Phase model is also available with or without a card reader.
- No wall? Use a stand: In open car parks without a suitable wall to mount the charger on, the WTL with stand or WTA with stand options are worth considering.
Practical tips for using your card
- Keep the card in your car, somewhere easy to reach but out of sight from outside.
- Don't lend your card to others; if the charger needs to be shared, set up separate authorisation for each user.
- If you lose your card, update the registered cards as described in your charger's user manual, or get help from the WiseCar Call Centre.
- If charging doesn't start even after tapping the card, first check your car's scheduled charging setting and charge limit. We list other possible causes in our guide Electric Car Not Charging?
Installation and physical protection
Installations in shared car parks require the charger to be fed from your own meter, with a dedicated circuit, a suitable circuit breaker and residual current protection. This work must always be carried out by a qualified electrician. In the provinces where it's available, you can use the WiseCar Charging Station Installation Service.
If you also want to protect the charger physically, take a look at the WiseCar IP65 Protective Enclosure, and to keep the cable tidy, our charging cable holder.
Frequently Asked Questions
Can a charger be used without an RFID card?
On a card-enabled charger, access control exists so that charging won't start unless a card is tapped. Which other methods can start the charger besides the card depends on the model; check your own charger's user manual.
Can RFID be added later to a charger I bought without a card reader?
That depends on the model's hardware. For WiseCar WTA3 and WTL models, the with-card or without-card option is chosen at the time of purchase. If you plan to use the charger in a shared space, it's best to decide from the start.
Can my neighbour charge with my charger?
That's entirely up to you. With WTA3 and WTL models, you can share your charger with other users through the mobile app and see each user's consumption separately with per-user reporting.
Does an RFID card affect charging speed?
No. The card only authorises charging to start. Charging speed depends on the charger's power, your electrical installation and the AC power your car can accept.
I have a closed, locked garage. Should I still get a card-enabled model?
Usually not. If no one but you can access your garage, a model without a card reader plus monitoring via the mobile app is enough for most users.
Conclusion
If your charger is somewhere other people can reach, an RFID card turns it into a charger that works only with your key. In residential car parks, workplaces and shared spaces, card access combined with the mobile app, notifications and per-user reporting is the most practical way to protect both your bill and your charger. In a locked garage, a model without a card reader is usually enough.
If you're looking for a card-enabled charging solution for your shared car park, browse WiseCar products or get support from the WiseCar Call Centre on 444 999 1.
This content is for general information only. RFID card registration, user sharing and remote access features may vary depending on the charger model and software version. For installations in shared areas, approval from the building management must be obtained, and all work on the electrical installation must be carried out by a qualified electrician.
