Typically, slow charging occurs at home or at work using a three-pin (3 kW AC) power source and the car’s own adaptor. As the name suggests, it’s the slowest option. That said, it’s also very convenient because charging can take place overnight.
However, it’s not recommended that owners leave their cars in a three-pin charging state for an extended period of time because this will lead to accelerated battery deterioration. Please check with the relevant car manufacturer for further details.
Slightly quicker home-charging options are available in the form of a dedicated charging unit with, for instance, a 3.6kW wallbox.