You Do Need power plug adapter while traveling from Palau 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 Palau are A and B. This is how they look like.

Palau

In Palau, outlets of type A and B are in use.

Type A

Type B

South Africa

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

Type C

Type M

Type N