You Do Need power plug adapter while traveling from Germany to South Africa.

Here is Why You Need An Adapter

The outlet and plug type used in South Africa are C, M and N and in Germany are C and F. This is how they look like.

Germany

In Germany, outlets of type C and F are in use.

Type C

Type F

South Africa

In South Africa, outlets of type C, M and N are in use.

Type C

Type M

Type N