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Solar data for the U.S. Virgin Islands

Across the 2 places in the U.S. Virgin Islands the best fixed tilt for solar panels runs from 17° in Saint Croix to 18° in Charlotte Amalie, and flat ground gets 5.7 to 5.8 peak sun hours a day. Every number is computed for each place.

Solar power in the U.S. Virgin Islands at a glance

Averages over 2 places with climate data, for a fixed array facing south.

Best panel angle18°average, facing south
Peak sun hours5.73a day on flat ground
1 kWp makes1,720kWh a year at the best angle
Off-grid angle23°average, for the darkest month
Saint Croix
  • 5.67–5.70
  • 5.70–5.72
  • 5.72–5.74
  • 5.74–5.76
  • 5.76–5.78

Peak sun hours a day on flat ground. Each dot is one place.

The sunniest place in the U.S. Virgin Islands is Saint Croix (Saint Croix Island) with 5.78 peak sun hours a day on flat ground; the least sunny is Charlotte Amalie with 5.67. A 1 kWp array at its best angle makes from 1,705 kWh a year in Charlotte Amalie to 1,735 kWh in Saint Croix — 1,720 kWh on average.

The best year-round tilt runs from 17° in Saint Croix to 18° in Charlotte Amalie. Off-grid systems are sized for the darkest month and do better steeper, at 23° on average: at 70° that month brings 1.71 kWh per kWp a day in Saint Croix and 1.75 kWh in Charlotte Amalie.

Size an off-grid system or open any place below for its sun path, monthly table and tilt curve.

Largest places in the U.S. Virgin Islands at a glance

PlaceLatitudeBest tiltOff-grid tiltSun hours/day (flat)
Saint Croix17.7° N17°22°5.78
Charlotte Amalie18.3° N18°23°5.67

Daylight and clock time in the U.S. Virgin Islands

In Charlotte Amalie (18.3° N), the northernmost place, the longest day of the year lasts 13 h 14 min and the shortest 11 h 02 min; in Saint Croix (17.7° N), the southernmost, 13 h 12 min and 11 h 04 min. The U.S. Virgin Islands does not use daylight saving time: the clocks stay the same all year.

Time zonePlacesUTC offsetClocks change in 2026
America/St_Thomas2UTC−4no daylight saving time

Questions about solar in the U.S. Virgin Islands

What is the best angle for solar panels in the U.S. Virgin Islands?
Facing south, between 17° and 18° depending on the place — 18° on average over 2 places. Off-grid systems that must get through the darkest month do better steeper, at about 23° on average.
How many peak sun hours does the U.S. Virgin Islands get?
From 5.7 hours a day in Charlotte Amalie to 5.8 in Saint Croix on flat ground, averaged over the year; 5.7 on average.
How much electricity does 1 kWp of solar panels produce in the U.S. Virgin Islands?
About 1,720 kWh a year at the best fixed angle on average, from 1,705 kWh in Charlotte Amalie to 1,735 kWh in Saint Croix. These are long-term climate averages; a single year can be several per cent higher or lower.
Where is the sunniest place in the U.S. Virgin Islands?
Saint Croix (Saint Croix Island) gets the most sun of the 2 places: 5.78 peak sun hours a day on flat ground, so 1 kWp there makes about 1,735 kWh a year.
Does the U.S. Virgin Islands use daylight saving time?
The U.S. Virgin Islands does not use daylight saving time: the clocks stay the same all year.
How long is the longest day in the U.S. Virgin Islands?
13 h 14 min in Charlotte Amalie; the shortest day lasts 11 h 02 min in Charlotte Amalie.

All places in the U.S. Virgin Islands

Saint Croix Island

Saint Thomas Island