As thousands of public charging stations are now installed on city streets around the world, EV Charging Service providers are encountering new maintenance challenges. How do you know if the EVSE is still safe and operational after 6 months or a year on the street?
Last month in Dublin Gridtest found a public EVSE with a stuck relay, resulting in a permanently live cable even when the car was disconnected. (State A and State B were both showing 240V on the charging lines). We found the same problem recently with another EVSE in the UK. This type of hazardous fault does not appear on EVSE network management systems.
The solution is to schedule regular preventative maintenance on EVSE’s every 2-3 months. The maintenance staff should be equipped with a test tool which can test all the safety features such as GFI/RCD trip current & timing. It should also save a test report as evidence that the EVSE was safe and operational on that date. The Gridtest EVE-100J is the right tool for this maintenance work.