$54,000 In Shock Protection: Why It's Important
That system is called an isolation link. According to IEEE Spectrum, the actual cost of this protection layer is an estimated $54,000. Scale that up to a full 8-stall charging location and that's more than $430,000 dedicated to only safety equipment. Here's how it works:
Gas pumps rely on mechanical flow control to stop fuel from flowing into a car. EV chargers deal with high-voltage electricity, often at 800 volts or more. Electricity is lazy—it's going to find the shortest path to ground, and if things go sideways at such a high power, it's enough to fry you instantly. You can see why safety is such a big deal.
An isolation link achieves a safety principle known as galvanic isolation. This means taking two separate circuits in a single electrical system and preventing current from flowing between them. In the world of EV chargers, this means severing the electrical path between the charger's power source and the car. So on the off chance that a fault does occur, the energy has nowhere to go but back into the grid.