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

Here is Why You Need An Adapter

The outlet and plug type used in Solomon Islands are G and I and in Greenland are C, E, F and K. This is how they look like.

Greenland

In Greenland, outlets of type C, E, F and K are in use.

Type C

Type E

Type F

Type K

Solomon Islands

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

Type G

Type I