Peak Sun Hours in San Luis, Santiago de Cuba Province, Cuba
- Solar zone
- Zone 4 (excellent)
- Best month
- July (6.1)
- Worst month
- December (4.0)
- Climate
- Tropical · 26.8°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 4.18 | 5.22 | 5.45 | 1.31 | 24.6 | 73 |
| Feb | 4.99 | 6.04 | 6.01 | 1.47 | 25.0 | 70 |
| Mar | 5.58 | 6.91 | 5.80 | 1.81 | 25.7 | 67 |
| Apr | 5.98 | 7.47 | 5.59 | 2.04 | 26.8 | 66 |
| May | 5.74 | 7.60 | 4.50 | 2.30 | 27.4 | 70 |
| Jun | 5.89 | 7.54 | 4.23 | 2.49 | 28.0 | 72 |
| Jul | 6.12 | 7.51 | 4.57 | 2.48 | 28.4 | 71 |
| Aug | 5.95 | 7.34 | 4.71 | 2.32 | 28.6 | 72 |
| Sep | 5.37 | 6.84 | 4.54 | 2.12 | 28.4 | 72 |
| Oct | 4.59 | 6.05 | 4.32 | 1.85 | 27.1 | 78 |
| Nov | 4.12 | 5.32 | 4.84 | 1.48 | 26.0 | 76 |
| Dec | 4.00 | 4.92 | 5.39 | 1.26 | 25.3 | 75 |
GHI, Clear-sky, DNI, DHI in kWh/m²/day. Data: NASA POWER climatology (long-term monthly averages).
Off-grid calculator
Add appliances
- Add an appliance to size a system.
Sizing
- Daily load
- 0.00 kWh
- Panel wattage
- 0 W
- Panel count (400W modules)
- 0
- Battery bank
- 0.0 kWh
Sizing against worst-month PSH of 4.00 kWh/m²/day, 0.77 system efficiency.
About solar in San Luis
San Luis, Cuba has a warm, tropical climate with a distinct wet and dry season. Its annual peak sun hours average 5.21 kWh/m²/day, a excellent solar resource by global standards.
The strongest month in San Luis is July (summer) at 6.12 kWh/m²/day, and the weakest is December (winter) at 4 kWh/m²/day. When sizing a year-round off-grid system, it's standard practice to design against the December value rather than the annual average — otherwise the battery bank runs low during the darkest weeks.
San Luis's solar conditions are well within the range where off-grid PV is a straightforward engineering exercise with standard-sized arrays and lithium batteries.
FAQ
- What are the peak sun hours in San Luis?
- San Luis averages 5.21 peak sun hours per day annually, ranging from 4 in December to 6.12 in July.
- How many solar panels do I need in San Luis?
- Panel count depends on your daily load. At San Luis's annual average of 5.21 kWh/m²/day, a 5 kWh/day load needs roughly 4 × 400 W panels. Use the calculator above for your actual load.
- What size battery do I need in San Luis?
- Sizing against San Luis's worst month (December, 4 kWh/m²/day) with 2 days of autonomy at 80% depth of discharge, a 5 kWh/day load needs about a 12.5 kWh battery bank.
- How does San Luis's solar resource compare globally?
- San Luis sits in solar zone 4 out of 5 (where 5 is strongest) at 5.21 kWh/m²/day — excellent by global standards. For reference, top-tier desert sites average ~6.5 and high-latitude cities around 2.5 kWh/m²/day.
- How does the wet season affect solar generation in San Luis?
- San Luis's dry-season output peaks at 6.12 kWh/m²/day in July; the wet season drops it to 4 in December. That ~41% swing is a key sizing consideration.
- Can solar panels survive tropical storms in San Luis?
- Most tier-1 PV panels are rated for 140+ mph wind loads; mounting hardware usually fails first. In cyclone-prone regions like Cuba, specify IEC 61215-certified panels and anchor-bolt mounts rather than ballasted.
- What's the dry-to-wet output gap in San Luis?
- San Luis swings from 6.12 kWh/m²/day in July (dry) to 4 in December (wet) — roughly 41%. Year-round off-grid systems must size against the wet-season minimum.