Peak Sun Hours in Imus, Calabarzon, Philippines
- Solar zone
- Zone 4 (excellent)
- Best month
- April (6.7)
- Worst month
- December (4.2)
- Climate
- Tropical · 27.3°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 4.58 | 5.63 | 4.35 | 1.81 | 25.5 | 80 |
| Feb | 5.37 | 6.34 | 4.88 | 1.92 | 26.1 | 76 |
| Mar | 6.14 | 6.94 | 5.29 | 2.05 | 27.6 | 72 |
| Apr | 6.67 | 7.28 | 5.71 | 2.13 | 29.3 | 68 |
| May | 6.01 | 7.29 | 4.39 | 2.32 | 29.3 | 75 |
| Jun | 5.27 | 7.21 | 3.15 | 2.43 | 28.2 | 82 |
| Jul | 4.68 | 7.16 | 2.38 | 2.36 | 27.4 | 85 |
| Aug | 4.35 | 7.11 | 1.88 | 2.37 | 27.3 | 86 |
| Sep | 4.75 | 6.89 | 2.57 | 2.36 | 27.2 | 85 |
| Oct | 4.79 | 6.35 | 3.33 | 2.16 | 27.3 | 83 |
| Nov | 4.52 | 5.75 | 3.94 | 1.85 | 26.8 | 84 |
| Dec | 4.15 | 5.37 | 3.87 | 1.73 | 26.0 | 84 |
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 4.15 kWh/m²/day, 0.77 system efficiency.
About solar in Imus
Imus, Philippines has a warm, tropical climate with a distinct wet and dry season. Its annual peak sun hours average 5.11 kWh/m²/day, a excellent solar resource by global standards.
The strongest month in Imus is April (spring) at 6.67 kWh/m²/day, and the weakest is December (winter) at 4.15 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.
Imus'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 Imus?
- Imus averages 5.11 peak sun hours per day annually, ranging from 4.15 in December to 6.67 in April.
- How many solar panels do I need in Imus?
- Panel count depends on your daily load. At Imus's annual average of 5.11 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 Imus?
- Sizing against Imus's worst month (December, 4.15 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 Imus's solar resource compare globally?
- Imus sits in solar zone 4 out of 5 (where 5 is strongest) at 5.11 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 Imus?
- Imus's dry-season output peaks at 6.67 kWh/m²/day in April; the wet season drops it to 4.15 in December. That ~49% swing is a key sizing consideration.
- Can solar panels survive tropical storms in Imus?
- 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 Imus?
- Imus swings from 6.67 kWh/m²/day in April (dry) to 4.15 in December (wet) — roughly 49%. Year-round off-grid systems must size against the wet-season minimum.