One of the most common questions we get asked is why we can’t install a 22kW charger at a customer’s house.
The most common reason is that the power supply isn’t sufficient to support a 22kW charger. This is because the property is on a single-phase power supply. For a 22kW charger, you need a three-phase power supply.
Single-phase power is a two-wire alternating current (AC) power circuit. Three-phase power is a three-wire alternative current circuit that can supply three times more power than single-phase.
Single-phase power can only support chargers up to 11kW, and even then, some domestic properties only have sufficient electrical capacity for an EV charger up to 7.4kW before excess power draw.
Another important point is that while EV chargers are happily integrated into most homes, domestic properties were never originally designed to accommodate EV chargers. Slow chargers of the 3.6kW variety and fast chargers up to 7.4kWh are typically fine, but 11kW can be a step too far.
When an EV charger draws too much power, it can affect the electrical supply to the rest of your house, making it essential that you size and specify the right charger.
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