Peak Sun Hours in Belém, Pará, Brazil
- Solar zone
- Zone 4 (excellent)
- Best month
- September (6.0)
- Worst month
- February (4.4)
- Climate
- Equatorial · 27.0°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 4.64 | 6.88 | 2.53 | 2.31 | 26.2 | 89 |
| Feb | 4.38 | 7.08 | 1.94 | 2.32 | 25.9 | 92 |
| Mar | 4.55 | 7.13 | 2.09 | 2.35 | 25.9 | 92 |
| Apr | 4.74 | 6.90 | 2.61 | 2.26 | 26.0 | 93 |
| May | 4.95 | 6.51 | 3.49 | 2.10 | 26.3 | 92 |
| Jun | 5.32 | 6.30 | 4.72 | 1.85 | 26.4 | 89 |
| Jul | 5.59 | 6.42 | 5.14 | 1.82 | 26.4 | 88 |
| Aug | 5.92 | 6.75 | 5.13 | 1.95 | 27.3 | 81 |
| Sep | 6.02 | 7.02 | 4.80 | 2.15 | 28.5 | 73 |
| Oct | 5.79 | 7.06 | 4.23 | 2.32 | 28.8 | 70 |
| Nov | 5.51 | 6.88 | 4.00 | 2.32 | 28.8 | 71 |
| Dec | 4.95 | 6.73 | 3.22 | 2.27 | 27.6 | 79 |
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 4.38 kWh/m²/day, 0.77 system efficiency.
About solar in Belém
Belém, Brazil sits near the equator, where day length is stable year-round and the sun passes close to overhead. Its annual peak sun hours average 5.2 kWh/m²/day, a excellent solar resource by global standards.
The strongest month in Belém is September (spring) at 6.02 kWh/m²/day, and the weakest is February (summer) at 4.38 kWh/m²/day. When sizing a year-round off-grid system, it's standard practice to design against the February value rather than the annual average — otherwise the battery bank runs low during the darkest weeks.
Belém'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 Belém?
- Belém averages 5.2 peak sun hours per day annually, ranging from 4.38 in February to 6.02 in September.
- How many solar panels do I need in Belém?
- Panel count depends on your daily load. At Belém's annual average of 5.2 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 Belém?
- Sizing against Belém's worst month (February, 4.38 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 Belém's solar resource compare globally?
- Belém sits in solar zone 4 out of 5 (where 5 is strongest) at 5.2 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.
- Why doesn't solar output vary much by month in Belém?
- Near the equator, day length is nearly constant year-round and the sun stays close to overhead. In Belém, monthly PSH ranges just from 4.38 to 6.02 kWh/m²/day — variance is driven by wet-season cloud cover, not day length.
- What tilt angle works best for panels in Belém?
- At latitude 1°, panels in Belém work best at a low tilt (roughly 1°) or horizontal. Tracking mounts add little benefit this close to the equator.
- How does the wet season affect solar output in Belém?
- Equatorial wet seasons reduce output through cloud cover, not day length. Belém's worst month (February) still delivers 4.38 kWh/m²/day — design against this value for reliable year-round off-grid use.