You Do Need power plug adapter while traveling from Saint Vincent and the Grenadines to Panama.

Here is Why You Need An Adapter

The outlet and plug type used in Panama are A and B and in Saint Vincent and the Grenadines are A, B and G. This is how they look like.

Saint Vincent and the Grenadines

In Saint Vincent and the Grenadines, outlets of type A, B and G are in use.

Type A

Type B

Type G

Panama

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

Type A

Type B