EV Charger Safety: Load Management & Surge Protection

Answer

Installing an Electric Vehicle (EV) charger at home involves more than just plugging in. Two critical safety measures often required are Surge Protection and Load Management. 

What is Load Management?

Your home’s electrical supply is limited by the Distribution Network Operator (DNO), typically to 60, 80, or 100 amps. Adding an EV charger increases demand, which can risk exceeding this limit. If an upgrade isn’t possible, a Load Management Device helps balance usage.

Why is it Needed?

  • Prevents overloading your property’s supply.
  • Ensures safe operation of EV chargers alongside other appliances.
  • Avoids tripping circuits or damaging equipment.

How It Works

  • Monitors real-time household consumption.
  • Dynamically adjusts power to the EV charger.
  • Temporarily reduces or pauses charging if demand approaches the limit.

What is Surge Protection?

Surge Protection Devices (SPDs) protect against sudden voltage spikes caused by:

  • Lightning strikes
  • Grid switching
  • Faults in the supply network

Without protection, these surges can damage your EV charger and pose a shock risk.

Why is it Needed?

  • Complies with BS 7671 wiring regulations.
  • Prevents electric shock from dangerous touch voltages.
  • Protects sensitive electronics from damage.

EO Chargers

 NOTE: O-PEN Protection: Built into the charger.   
 
What it does:
  • Monitors the incoming electrical supply and disconnects charging if voltage falls outside the safe operating range or if an Open PEN fault is detected.
  • Voltage Thresholds: 209V – 253V.
  • Reset Behaviour: Automatic reset. 
Important: If O-PEN protection operates, charging will not automatically resume. The charger must be manually reset before charging can continue. 

 

Alfen Chargers

 NOTE: O-PEN Protection: Provided by a separate external device installed as part of the charging installation.  

What it does:

  • Protects against Open PEN faults and unsafe voltage conditions. 
  • Voltage Thresholds: 216V – 253V. 
  • Reset Behaviour: Automatic reset. 

Important: The external protection device will automatically reconnect the charger when supply conditions return to normal. 

 

Sync Energy Chargers 
 NOTE: O-PEN Protection: Built into charger 
 What it does:
  • Monitors the electrical supply for voltage abnormalities and Open PEN faults. 
  • Voltage Thresholds: 207V – 253V.
  • Reset Behaviour: Automatic reset
 
Important: Once the electrical supply returns to normal, the charger will automatically attempt to resume operation.