You plug your car in at night, expect it to charge while you sleep, and then find that the electricity has tripped.

You reset it.

It happens again.

Sometimes the charger works perfectly for several days and then suddenly trips. Other times, it trips almost immediately after you connect the car.

This is frustrating, but it doesn’t always mean that the charger itself is faulty.

There are several reasons why an EV charger can trip an electrical circuit, and the cause needs to be properly checked rather than simply resetting the power each time.

Here are some of the things we would look at when investigating the problem.

1. The charger may be detecting an electrical fault

An EV charger is connected to a relatively high-load electrical circuit. Because of that, the protective devices installed with the charger are there for a reason.

If the system detects a fault or abnormal current, the protection can disconnect the supply.

That may actually be the safety system doing its job.

The important thing is to find out why it has operated.

Repeatedly switching the breaker back on without finding the cause isn’t a proper fix.

2. It could be the car rather than the charger

This is something that can easily be overlooked.

If your charger has been working normally and suddenly starts tripping, the vehicle should also be considered.

A fault with the vehicle’s charging equipment, charging cable or onboard charging system can sometimes cause the charging process to stop.

One useful check is whether the problem happens with another compatible vehicle.

If another vehicle charges normally from the same charger, that gives an installer another useful clue.

Likewise, if your car has problems charging from more than one charger, the vehicle may need to be checked.

3. Load balancing could be an issue

This is particularly relevant in some London homes.

Your EV charger isn’t necessarily the only large electrical load in the property.

At the same time, you might have an electric shower, oven, induction hob, immersion heater, heat pump or other high-powered appliances running.

If the property’s available electrical capacity is being pushed too hard, the charging installation may need to manage the load more carefully.

A properly designed load management system can reduce the charging power when the house is using more electricity and increase it again when demand falls.

This can be especially useful where the available supply is limited.

4. The RCD or other protective device may be operating

EV charging installations require appropriate electrical protection.

The exact arrangement depends on the charger and installation, but the protection needs to deal with the types of fault currents that can occur during EV charging.

For example, some chargers have built-in DC fault protection, while other installations require additional protection.

This is one reason why it isn’t sensible to replace a protective device with a different one simply because the original keeps tripping.

The correct protection needs to be determined from the charger manufacturer’s requirements and the installation itself.

5. There could be a problem with the cable or connection

An EV charger installation involves more than the charger mounted on the wall.

There is the cable run, protective devices, connections, and other electrical equipment between the charger and the property’s supply.

If there is a damaged cable, loose connection, or another installation fault, the protective device may operate when the charger starts drawing current.

Outdoor installations also have to deal with weather and the environment.

If a fault has developed after the installation, it needs to be tested rather than guessed at.

6. It may only happen at a particular charging power

Sometimes the charger doesn’t trip immediately.

It might charge for an hour or two and then stop.

That can provide an important clue.

A problem that only appears when the charger has been drawing a high load for a period of time can be different from a fault that occurs immediately when charging begins.

This is why an installer may ask questions such as:

When does it trip?

Does it happen every time?

What was running in the house at the time?

Does it happen with the car plugged in but not charging?

Does reducing the charging current make a difference?

Those details can help narrow down the problem.

7. The original installation may need to be checked

If you have recently moved into a property and the EV charger was installed by someone else, don’t automatically assume that the installation is correct simply because the charger has been working.

An installer investigating repeated tripping should look at the installation as a whole.

That can include the charger, protective devices, cable, connections, earthing arrangement and the property’s electrical supply.

Testing is much more useful than simply changing components until the problem disappears.

Should You Keep Resetting the Charger?

No.

If an EV charger repeatedly trips the electrical supply, don’t keep resetting it and hoping it will eventually work.

A protective device that keeps operating is giving you information.

There is a reason it is disconnecting the circuit.

If you are not electrically qualified, don’t remove covers, change protective devices or attempt to bypass the protection yourself.

Instead, arrange for the installation to be checked by a suitably qualified electrician or EV charger installer.

What If the Charger Worked Fine Before?

This is quite common.

An installation can work normally for months or years and then develop a problem.

It doesn’t necessarily mean the original installation was wrong.

Equipment can fail. Connections can deteriorate. A vehicle can develop a charging fault. Electrical demand in the property can change.

For example, a homeowner may have installed an EV charger when the house had relatively few high-power appliances. Later they may add an induction hob, heat pump or other electrical equipment.

The situation has changed, even though the charger hasn’t.

Don’t Ignore a Charger That Keeps Tripping

An occasional electrical trip can be difficult to diagnose without seeing the installation.

But if your EV charger repeatedly causes the electricity to trip, it is worth getting it investigated.

The answer might be relatively straightforward.

It could be the vehicle, the charger, the protection, the cable, the house load or another part of the electrical installation.

The important thing is to identify the actual cause rather than simply treating the symptom.

A Practical Approach From an Installer’s Point of View

When we investigate an EV charger problem, the first thing we’d want to know is what is actually happening.

Does it trip as soon as charging starts?

Does it happen after 30 minutes?

Does it only happen when other appliances are being used?

Does the charger work with another vehicle?

Has anything changed in the property recently?

These questions can sometimes tell us more than simply knowing that “the charger keeps tripping”.

And that’s why a proper inspection is important.

An EV charger is a significant electrical load in a home. If its protective equipment is operating repeatedly, the safest approach is to find out why.

Final Thoughts

A tripping EV charger doesn’t automatically mean you need a new charger.

It also doesn’t automatically mean that your home’s electrical supply is inadequate.

There are several possible causes, and the correct solution depends on what testing finds.

If your charger has started tripping repeatedly, stop treating the reset button as the solution. Get the installation checked and find out what is actually causing the problem.

A reliable EV charger should fit properly into the electrical system of the property, rather than constantly fighting against it.

London EV Chargers installs EV charging systems across London and the surrounding areas. If your charger is repeatedly tripping or has developed a charging problem, a proper assessment can help identify the cause before unnecessary equipment is replaced.