Peak Sun Hours in Brasília, Federal District, Brazil
- Solar zone
- Zone 4 (excellent)
- Best month
- September (6.1)
- Worst month
- June (4.8)
- Climate
- Tropical · 22.2°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 5.87 | 8.15 | 3.72 | 2.56 | 22.4 | 81 |
| Feb | 5.92 | 7.93 | 4.05 | 2.46 | 22.3 | 82 |
| Mar | 5.50 | 7.32 | 3.82 | 2.31 | 22.1 | 84 |
| Apr | 5.34 | 6.50 | 4.96 | 1.83 | 21.5 | 82 |
| May | 4.96 | 5.66 | 5.63 | 1.45 | 20.2 | 75 |
| Jun | 4.83 | 5.27 | 6.25 | 1.19 | 19.7 | 66 |
| Jul | 5.14 | 5.52 | 6.73 | 1.11 | 20.2 | 54 |
| Aug | 5.81 | 6.26 | 6.82 | 1.27 | 22.3 | 44 |
| Sep | 6.14 | 6.95 | 5.93 | 1.70 | 24.9 | 43 |
| Oct | 5.96 | 7.67 | 4.64 | 2.16 | 25.2 | 57 |
| Nov | 5.42 | 8.00 | 3.20 | 2.53 | 23.2 | 76 |
| Dec | 5.65 | 8.12 | 3.49 | 2.55 | 22.6 | 80 |
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 4.83 kWh/m²/day, 0.77 system efficiency.
About solar in Brasília
Brasília, Brazil has a warm, tropical climate with a distinct wet and dry season. Its annual peak sun hours average 5.55 kWh/m²/day, a excellent solar resource by global standards.
The strongest month in Brasília is September (spring) at 6.14 kWh/m²/day, and the weakest is June (winter) at 4.83 kWh/m²/day. When sizing a year-round off-grid system, it's standard practice to design against the June value rather than the annual average — otherwise the battery bank runs low during the darkest weeks.
Brasília'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 Brasília?
- Brasília averages 5.55 peak sun hours per day annually, ranging from 4.83 in June to 6.14 in September.
- How many solar panels do I need in Brasília?
- Panel count depends on your daily load. At Brasília's annual average of 5.55 kWh/m²/day, a 5 kWh/day load needs roughly 3 × 400 W panels. Use the calculator above for your actual load.
- What size battery do I need in Brasília?
- Sizing against Brasília's worst month (June, 4.83 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 Brasília's solar resource compare globally?
- Brasília sits in solar zone 4 out of 5 (where 5 is strongest) at 5.55 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 Brasília?
- Brasília's dry-season output peaks at 6.14 kWh/m²/day in September; the wet season drops it to 4.83 in June. That ~24% swing is a key sizing consideration.
- Can solar panels survive tropical storms in Brasília?
- Most tier-1 PV panels are rated for 140+ mph wind loads; mounting hardware usually fails first. In cyclone-prone regions like Brazil, specify IEC 61215-certified panels and anchor-bolt mounts rather than ballasted.
- What's the dry-to-wet output gap in Brasília?
- Brasília swings from 6.14 kWh/m²/day in September (dry) to 4.83 in June (wet) — roughly 24%. Year-round off-grid systems must size against the wet-season minimum.