You Do Need power plug adapter while traveling from Solomon Islands to Sint Maarten.

Here is Why You Need An Adapter

The outlet and plug type used in Sint Maarten are A and B 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

Sint Maarten

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

Type A

Type B