Solarposition.org

2 places · sun position · panel angle

Solar data for Saint Lucia

Across the 2 places in Saint Lucia the best fixed tilt for solar panels runs from 14° in Castries to 15° in Gros Islet, and flat ground gets 5.8 to 5.8 peak sun hours a day. Every number is computed for each place.

Solar power in Saint Lucia at a glance

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

Best panel angle15°average, facing south
Peak sun hours5.78a day on flat ground
1 kWp makes1,712kWh a year at the best angle
Off-grid angle12°average, for the darkest month
Gros IsletCastries (most sun)
  • 5.78 peak sun hours a day

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

The sunniest place in Saint Lucia is Castries (Castries) with 5.78 peak sun hours a day on flat ground; the least sunny is Gros Islet with 5.77. A 1 kWp array at its best angle makes from 1,711 kWh a year in Gros Islet to 1,712 kWh in Castries — 1,712 kWh on average.

The best year-round tilt runs from 14° in Castries to 15° in Gros Islet. Off-grid systems are sized for the darkest month and do better steeper, at 12° on average: at 70° that month brings 1.49 kWh per kWp a day in Castries and 1.49 kWh in Gros Islet.

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

Largest places in Saint Lucia at a glance

PlaceLatitudeBest tiltOff-grid tiltSun hours/day (flat)
Gros Islet14.1° N15°12°5.77
Castries14.0° N14°12°5.78

Daylight and clock time in Saint Lucia

In Gros Islet (14.1° N), the northernmost place, the longest day of the year lasts 12 h 58 min and the shortest 11 h 18 min; in Castries (14.0° N), the southernmost, 12 h 57 min and 11 h 18 min. Saint Lucia does not use daylight saving time: the clocks stay the same all year.

Time zonePlacesUTC offsetClocks change in 2026
America/St_Lucia2UTC−4no daylight saving time

Questions about solar in Saint Lucia

What is the best angle for solar panels in Saint Lucia?
Facing south, between 14° and 15° depending on the place — 15° on average over 2 places. Off-grid systems that must get through the darkest month do better steeper, at about 12° on average.
How many peak sun hours does Saint Lucia get?
From 5.8 hours a day in Gros Islet to 5.8 in Castries on flat ground, averaged over the year; 5.8 on average.
How much electricity does 1 kWp of solar panels produce in Saint Lucia?
About 1,712 kWh a year at the best fixed angle on average, from 1,711 kWh in Gros Islet to 1,712 kWh in Castries. These are long-term climate averages; a single year can be several per cent higher or lower.
Where is the sunniest place in Saint Lucia?
Castries (Castries) gets the most sun of the 2 places: 5.78 peak sun hours a day on flat ground, so 1 kWp there makes about 1,712 kWh a year.
Does Saint Lucia use daylight saving time?
Saint Lucia does not use daylight saving time: the clocks stay the same all year.
How long is the longest day in Saint Lucia?
12 h 58 min in Gros Islet; the shortest day lasts 11 h 18 min in Gros Islet.

All places in Saint Lucia

Castries

Gros-Islet