What Happens to Your EV Charger When the Power Goes Out

Then the lights flicker, the power cuts out, and everything goes quiet. Your EV charger stops mid-charge and you start to wonder what actually happens during a power outage. Can your charger be damaged? Will it restart automatically? Let’s explore what really goes on when your EV charger loses power and what you should do next.

EV Chargers and Power Cuts

When there is a power cut, your EV charger will stop working immediately. Chargers depend entirely on your home’s electrical supply, so once power is lost, they automatically shut down to stay safe.

Modern EV chargers used in UK homes are built with protective features that detect any change in voltage. The moment the electricity supply drops, they stop transferring power to your vehicle. This built-in protection prevents overheating, faults or electrical surges when power is eventually restored.

So even if the power goes out while your car is still charging, both your charger and vehicle remain protected.

What Happens When Power Returns

Once electricity comes back, most EV chargers stay idle until you either restart the charge manually or until their smart settings kick in. Some newer models like the Ohme Home Pro, Zappi, or Easee One automatically resume charging once the connection is stable again.

If your car is still plugged in, it may simply pick up where it left off. But it is always a good idea to check your charger once power has been restored. Look at the display lights, inspect the car dashboard for any warnings, and make sure the charging indicator is active again.

Taking a few moments to check everything can prevent any unnoticed faults or incomplete charging cycles.

Can Power Cuts Damage Your EV Charger

Most of the time, a simple power cut does not cause any lasting harm. The real risk comes from power surges that may occur when electricity is restored. A sudden voltage spike can affect sensitive electronic components, including those inside your EV charger.

This is why professional installers like JJB Electrical always include proper surge and circuit protection during installation. If your EV charger is protected by an RCD and surge protection device, the risk of damage is extremely low.

If your system was installed several years ago or by an unqualified installer, it may be worth having it checked to ensure the correct safety features are in place. A quick inspection could save you a costly repair in the future.

Smart Chargers and Power Interruptions

Smart chargers are becoming increasingly popular across the UK, and one of their major benefits is how well they handle power interruptions. These chargers are designed to store data from previous charging sessions and can remember your preferred settings and schedules.

If a temporary outage occurs, a smart charger can automatically resume charging once the supply stabilises. Some can even delay restarting until cheaper off-peak tariff hours begin again.

Many smart EV chargers also include load balancing, which prevents your home’s power system from becoming overloaded when electricity returns. Combined with app connectivity, you can check and control your charging status remotely, even if you are not home.

Should You Unplug During a Power Cut

If the power cut lasts for more than a few minutes or if you suspect the outage was caused by a storm, unplugging your charger is a smart move. While modern chargers can handle most fluctuations, physically disconnecting the cable provides an extra level of safety.

This is especially important for outdoor chargers that might be exposed to damp or wet conditions. Once the power supply has been stable for a few minutes, you can safely reconnect and start charging again.

Why Proper Installation Matters

The way your charger is installed plays a huge role in how it performs during power interruptions. A properly wired and protected system will always recover safely after a power loss.

At JJB Electrical, every EV charger installation follows the latest BS7671 wiring standards. We install the correct surge protection devices, fit RCD protection for all charging circuits, and carry out full load testing before completion.

Our NAPIT approved team ensures your charger works efficiently with your home’s electrical supply and can handle future upgrades, such as solar power or battery storage.

When to Call for an Inspection

If you have noticed frequent tripping circuits, flickering lights during charging, or any signs of inconsistent power, it might be time for an inspection. These issues could indicate loose wiring, circuit overload, or outdated protection devices.

A professional electrician can carry out a quick safety check to confirm that your system is running correctly. Preventive maintenance ensures your EV charger lasts longer and operates safely year-round.

Final Thoughts

Power cuts are inevitable, especially during colder months in the UK. But with the right installation and equipment, your EV charger can handle them safely. Smart features, surge protection, and professional wiring all work together to keep your charging system reliable, even when the lights go out.

If you are thinking about getting a home EV charger installed or would like to have your current charger checked for safety and reliability, JJB Electrical is here to help.

📞 Call 01992 276084 today to book your EV charger consultation or inspection

Proudly serving Cheshunt, Broxbourne, Hoddesdon, Hertford, and surrounding areas.