You Do Need power plug adapter while traveling from Solomon Islands to Cape Verde.

Here is Why You Need An Adapter

The outlet and plug type used in Cape Verde are C and F and in Solomon Islands are G and I. This is how they look like.

Solomon Islands

In Solomon Islands, outlets of type G and I are in use.

Type G

Type I

Cape Verde

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

Type C

Type F