Peak Sun Hours in São José do Rio Preto, São Paulo, Brazil
- Solar zone
- Zone 4 (excellent)
- Best month
- November (6.2)
- Worst month
- June (4.1)
- Climate
- Tropical · 23.9°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 5.86 | 8.16 | 3.72 | 2.73 | 25.3 | 79 |
| Feb | 6.03 | 7.80 | 4.46 | 2.45 | 25.1 | 80 |
| Mar | 5.66 | 7.03 | 4.85 | 2.13 | 24.6 | 80 |
| Apr | 5.18 | 6.04 | 5.56 | 1.60 | 23.5 | 77 |
| May | 4.36 | 5.10 | 5.30 | 1.32 | 20.8 | 74 |
| Jun | 4.10 | 4.60 | 5.55 | 1.12 | 20.2 | 70 |
| Jul | 4.38 | 4.86 | 5.95 | 1.07 | 20.4 | 61 |
| Aug | 5.15 | 5.66 | 6.40 | 1.18 | 22.7 | 52 |
| Sep | 5.55 | 6.44 | 5.62 | 1.59 | 25.5 | 50 |
| Oct | 5.93 | 7.45 | 4.85 | 2.25 | 26.9 | 58 |
| Nov | 6.18 | 8.12 | 4.67 | 2.57 | 26.1 | 66 |
| Dec | 6.17 | 8.26 | 4.29 | 2.72 | 25.7 | 75 |
GHI, Clear-sky, DNI, DHI in kWh/m²/day. Data: NASA POWER climatology (long-term monthly averages).
Off-grid calculator
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- 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 4.10 kWh/m²/day, 0.77 system efficiency.
About solar in São José do Rio Preto
São José do Rio Preto, Brazil has a warm, tropical climate with a distinct wet and dry season. Its annual peak sun hours average 5.38 kWh/m²/day, a excellent solar resource by global standards.
The strongest month in São José do Rio Preto is November (spring) at 6.18 kWh/m²/day, and the weakest is June (winter) at 4.1 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.
São José do Rio Preto'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 São José do Rio Preto?
- São José do Rio Preto averages 5.38 peak sun hours per day annually, ranging from 4.1 in June to 6.18 in November.
- How many solar panels do I need in São José do Rio Preto?
- Panel count depends on your daily load. At São José do Rio Preto's annual average of 5.38 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 São José do Rio Preto?
- Sizing against São José do Rio Preto's worst month (June, 4.1 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 São José do Rio Preto's solar resource compare globally?
- São José do Rio Preto sits in solar zone 4 out of 5 (where 5 is strongest) at 5.38 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 São José do Rio Preto?
- São José do Rio Preto's dry-season output peaks at 6.18 kWh/m²/day in November; the wet season drops it to 4.1 in June. That ~39% swing is a key sizing consideration.
- Can solar panels survive tropical storms in São José do Rio Preto?
- 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 São José do Rio Preto?
- São José do Rio Preto swings from 6.18 kWh/m²/day in November (dry) to 4.1 in June (wet) — roughly 39%. Year-round off-grid systems must size against the wet-season minimum.