Peak Sun Hours in Goiânia, Goiás, Brazil
- Solar zone
- Zone 4 (excellent)
- Best month
- September (5.9)
- Worst month
- June (4.8)
- Climate
- Tropical · 23.1°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 5.70 | 8.14 | 3.35 | 2.63 | 23.3 | 82 |
| Feb | 5.78 | 7.90 | 3.69 | 2.50 | 23.2 | 82 |
| Mar | 5.55 | 7.26 | 3.94 | 2.29 | 23.1 | 83 |
| Apr | 5.41 | 6.42 | 5.16 | 1.78 | 22.4 | 82 |
| May | 4.98 | 5.58 | 5.78 | 1.39 | 20.6 | 76 |
| Jun | 4.78 | 5.16 | 6.19 | 1.16 | 20.2 | 68 |
| Jul | 5.07 | 5.41 | 6.59 | 1.09 | 20.9 | 56 |
| Aug | 5.72 | 6.15 | 6.72 | 1.27 | 23.5 | 44 |
| Sep | 5.93 | 6.83 | 5.51 | 1.80 | 26.3 | 43 |
| Oct | 5.83 | 7.60 | 4.19 | 2.33 | 26.1 | 59 |
| Nov | 5.59 | 8.02 | 3.25 | 2.65 | 24.2 | 76 |
| Dec | 5.62 | 8.13 | 3.29 | 2.60 | 23.6 | 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 4.78 kWh/m²/day, 0.77 system efficiency.
About solar in Goiânia
Goiânia, Brazil has a warm, tropical climate with a distinct wet and dry season. Its annual peak sun hours average 5.5 kWh/m²/day, a excellent solar resource by global standards.
The strongest month in Goiânia is September (spring) at 5.93 kWh/m²/day, and the weakest is June (winter) at 4.78 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.
Goiânia'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 Goiânia?
- Goiânia averages 5.5 peak sun hours per day annually, ranging from 4.78 in June to 5.93 in September.
- How many solar panels do I need in Goiânia?
- Panel count depends on your daily load. At Goiânia's annual average of 5.5 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 Goiânia?
- Sizing against Goiânia's worst month (June, 4.78 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 Goiânia's solar resource compare globally?
- Goiânia sits in solar zone 4 out of 5 (where 5 is strongest) at 5.5 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 Goiânia?
- Goiânia's dry-season output peaks at 5.93 kWh/m²/day in September; the wet season drops it to 4.78 in June. That ~21% swing is a key sizing consideration.
- Can solar panels survive tropical storms in Goiânia?
- 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 Goiânia?
- Goiânia swings from 5.93 kWh/m²/day in September (dry) to 4.78 in June (wet) — roughly 21%. Year-round off-grid systems must size against the wet-season minimum.