October 19, 2022
Some wall-mounted EV chargers, like the EnelX JuiceBox series, offer both hardwire and plug-in options. A hardwired charger runs the electrical circuit directly to the device, while a plug-in device requires a 240 volt outlet to be installed. The charger is then wall-mounted and plugged into the outlet.
While a plug-in charger offers more flexibility since it can be removed, we recommend hardwire installation where possible since it is a safer, more affordable, and more reliable solution. National Fire Protection Agency and National Electrical Code require expensive GFCI breakers to be installed on 240 volt outlet installations in garages and outdoors, where there is potential for water intrusion to the outlet. When more than one GFCI is installed on the same circuit, the signals can create a false positive and shut the circuit off. Since GFCI protection is already built into most EV chargers and vehicles, this additional protection often causes nuisance tripping. You can learn more about this issue here.
If you're still deciding what charger to get, check out the Treehouse EV charger guide.
We've put together a few helpful resources to prepare you for installation day.
Installing more than one GFCI on the same circuit can result in nuisance tripping. For this reason, we recommend installing a hardwired charger.
Federal Pacific Electric (FPE) and Zinsco panels have design flaws that can cause their breakers to fail, creating a safety hazard.