Peak Sun Hours in Davao, Davao Region, Philippines
- Solar zone
- Zone 3 (good)
- Best month
- April (5.6)
- Worst month
- January (4.2)
- Climate
- Equatorial · 27.5°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 4.22 | 6.47 | 2.51 | 2.24 | 26.7 | 83 |
| Feb | 4.80 | 6.96 | 3.07 | 2.33 | 26.6 | 82 |
| Mar | 5.34 | 7.36 | 3.47 | 2.46 | 27.1 | 80 |
| Apr | 5.64 | 7.40 | 3.77 | 2.49 | 27.9 | 78 |
| May | 5.27 | 7.15 | 3.22 | 2.49 | 28.3 | 79 |
| Jun | 4.99 | 6.99 | 2.73 | 2.55 | 27.9 | 79 |
| Jul | 4.93 | 7.01 | 2.51 | 2.59 | 27.6 | 79 |
| Aug | 5.13 | 7.12 | 2.63 | 2.63 | 27.6 | 80 |
| Sep | 5.18 | 7.11 | 2.75 | 2.62 | 27.8 | 79 |
| Oct | 5.01 | 6.82 | 2.96 | 2.47 | 27.9 | 79 |
| Nov | 4.62 | 6.53 | 3.03 | 2.27 | 27.7 | 80 |
| Dec | 4.34 | 6.28 | 2.90 | 2.19 | 27.3 | 82 |
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 4.22 kWh/m²/day, 0.77 system efficiency.
About solar in Davao
Davao, Philippines sits near the equator, where day length is stable year-round and the sun passes close to overhead. Its annual peak sun hours average 4.96 kWh/m²/day, a good solar resource by global standards.
The strongest month in Davao is April (spring) at 5.64 kWh/m²/day, and the weakest is January (winter) at 4.22 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.
Davao'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 Davao?
- Davao averages 4.96 peak sun hours per day annually, ranging from 4.22 in January to 5.64 in April.
- How many solar panels do I need in Davao?
- Panel count depends on your daily load. At Davao's annual average of 4.96 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 Davao?
- Sizing against Davao's worst month (January, 4.22 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 Davao's solar resource compare globally?
- Davao sits in solar zone 3 out of 5 (where 5 is strongest) at 4.96 kWh/m²/day — good by global standards. For reference, top-tier desert sites average ~6.5 and high-latitude cities around 2.5 kWh/m²/day.
- Why doesn't solar output vary much by month in Davao?
- Near the equator, day length is nearly constant year-round and the sun stays close to overhead. In Davao, monthly PSH ranges just from 4.22 to 5.64 kWh/m²/day — variance is driven by wet-season cloud cover, not day length.
- What tilt angle works best for panels in Davao?
- At latitude 7°, panels in Davao work best at a low tilt (roughly 7°) or horizontal. Tracking mounts add little benefit this close to the equator.
- How does the wet season affect solar output in Davao?
- Equatorial wet seasons reduce output through cloud cover, not day length. Davao's worst month (January) still delivers 4.22 kWh/m²/day — design against this value for reliable year-round off-grid use.