We recommend the use of the 32 amp cable. Our cables will automatically switch between 16 and 32 amps so our 16 amp cables can be safely used on a 32 amp charging station and vice versa.
Your BMW i5 has a CCS type 2 charging socket which looks like this:
The top 7 pins are your standard Type 2 port and the lower pins are used for AC rapid charging which are installed at service stations. For home and fast charging, you will need a Type 2 to Type 2 cable of 16 or 32amps.