I've recently found a marvel, the DCC. It's a demand charge controller for an electric vehicle enabling the installation of the EV charger when load calculation is max out.
It works like a loadmiser, but instead, it is directly installed on the main power source of the house with a 40amps feeder going to the DCC. The CT's (installed on main power source) read the demand for the controller and it automatically stops the charging if 80% of the main breaker capacity is reached. After 15 minutes under 80%, the EV charger is re-energized automatically.
Only in french for documentations, but it is approved CSA US for installation across north America.