Question about Steffen digital brilliant

This is an electric meter, not an electricity meter. Intended for short-term measurement of consumption. But not for a high continuous load. Since it has overload protection, it should also be possible to measure the charging of an electric car for a few nights. After that, you know the consumption and the power loss. With this, you can extrapolate the annual consumption. If you want to know exactly, install a meter and, even better, a charging station with an integrated meter. Household sockets are not intended or designed for daily charging of electric cars.