You Do Need power plug adapter while traveling from United States Virgin Islands to Guadeloupe.

Here is Why You Need An Adapter

The outlet and plug type used in Guadeloupe are C and E and in United States Virgin Islands are A and B. This is how they look like.

United States Virgin Islands

In United States Virgin Islands, outlets of type A and B are in use.

Type A

Type B

Guadeloupe

In Guadeloupe, outlets of type C and E are in use.

Type C

Type E