Previously you would have had to upgrade your electrical service which can be an expensive option. Now there is a new product produced by DCC Technology the DCC-9 and DCC-10. These products are demand charge controllers for Electric Vehicles. They get installed at the main electrical panel. When they are hooked up they constantly monitor the current flow at the main breaker. If the current flow reaches 80% of the main circuit breakers capacity the EV charger is de-energized. When the power consumption is less than 80% of the capacity for more than 15 minutes the EV charger is re-energized. This is a much less expensive option than an upgraded electrical service. dcc.technology/faq