In theory, there are three different ways to drink an electric car with electricity in your own garage or carport. Depending on the components installed, however, not all three are always available. Variant 1: On the one hand, it is possible to charge the car by means of a PV surplus alone. This variant does not require additional grid connection, but also requires sufficient excess power from the solar system to operate the minimum charging current of the vehicle. If there is not enough energy left over from the solar system, the car will not be charged until there is enough excess electricity again. Variant 2: The second option consists of a combined use of PV surplus and grid reference. After the electricity consumers in the household are supplied, the electric car is charged with the remaining solar power. If there is not enough electricity to achieve the minimum charging power, electricity is obtained from the grid. Everything that goes beyond the minimum charging current is charged exclusively with PV surplus. Although you are not 100% self-sufficient, you can ensure that the car is constantly charged. In variant 3, the priority is to charge the vehicle quickly. Depending on the wallbox and the connected vehicle, the maximum charging power is used to load the electric car with energy from the PV system and from the grid. No consideration is given to other consumers, so that all available solar power is first used and then the rest is filled with mains power.