Peak Sun Hours in Iligan, Northern Mindanao, Philippines
- Solar zone
- Zone 4 (excellent)
- Best month
- April (6.0)
- Worst month
- January (4.2)
- Climate
- Tropical · 23.0°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 4.20 | 6.32 | 2.87 | 2.11 | 22.1 | 89 |
| Feb | 4.88 | 6.86 | 3.48 | 2.25 | 22.2 | 86 |
| Mar | 5.57 | 7.31 | 4.08 | 2.36 | 23.1 | 82 |
| Apr | 5.99 | 7.41 | 4.49 | 2.40 | 24.3 | 78 |
| May | 5.47 | 7.16 | 3.72 | 2.46 | 24.2 | 83 |
| Jun | 5.05 | 6.99 | 3.01 | 2.51 | 23.3 | 87 |
| Jul | 4.98 | 6.99 | 2.74 | 2.57 | 22.8 | 88 |
| Aug | 5.17 | 7.08 | 2.83 | 2.63 | 22.7 | 88 |
| Sep | 5.14 | 7.05 | 2.84 | 2.61 | 22.7 | 89 |
| Oct | 5.02 | 6.78 | 3.13 | 2.45 | 22.9 | 89 |
| Nov | 4.69 | 6.42 | 3.47 | 2.19 | 22.9 | 88 |
| Dec | 4.36 | 6.12 | 3.31 | 2.10 | 22.6 | 88 |
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 4.20 kWh/m²/day, 0.77 system efficiency.
About solar in Iligan
Iligan, Philippines has a warm, tropical climate with a distinct wet and dry season. Its annual peak sun hours average 5.04 kWh/m²/day, a excellent solar resource by global standards.
The strongest month in Iligan is April (spring) at 5.99 kWh/m²/day, and the weakest is January (winter) at 4.2 kWh/m²/day. When sizing a year-round off-grid system, it's standard practice to design against the January value rather than the annual average — otherwise the battery bank runs low during the darkest weeks.
Iligan'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 Iligan?
- Iligan averages 5.04 peak sun hours per day annually, ranging from 4.2 in January to 5.99 in April.
- How many solar panels do I need in Iligan?
- Panel count depends on your daily load. At Iligan's annual average of 5.04 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 Iligan?
- Sizing against Iligan's worst month (January, 4.2 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 Iligan's solar resource compare globally?
- Iligan sits in solar zone 4 out of 5 (where 5 is strongest) at 5.04 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 Iligan?
- Iligan's dry-season output peaks at 5.99 kWh/m²/day in April; the wet season drops it to 4.2 in January. That ~36% swing is a key sizing consideration.
- Can solar panels survive tropical storms in Iligan?
- Most tier-1 PV panels are rated for 140+ mph wind loads; mounting hardware usually fails first. In cyclone-prone regions like Philippines, specify IEC 61215-certified panels and anchor-bolt mounts rather than ballasted.
- What's the dry-to-wet output gap in Iligan?
- Iligan swings from 5.99 kWh/m²/day in April (dry) to 4.2 in January (wet) — roughly 36%. Year-round off-grid systems must size against the wet-season minimum.