Peak Sun Hours in Ribeirão Preto, São Paulo, Brazil
- Solar zone
- Zone 4 (excellent)
- Best month
- November (6.0)
- Worst month
- June (4.0)
- Climate
- Tropical · 22.5°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 5.71 | 8.23 | 3.58 | 2.71 | 23.6 | 82 |
| Feb | 5.92 | 7.83 | 4.36 | 2.45 | 23.6 | 82 |
| Mar | 5.49 | 7.01 | 4.59 | 2.15 | 23.0 | 83 |
| Apr | 5.04 | 5.97 | 5.34 | 1.60 | 22.0 | 79 |
| May | 4.22 | 5.01 | 5.12 | 1.34 | 19.7 | 74 |
| Jun | 3.98 | 4.52 | 5.33 | 1.15 | 19.3 | 69 |
| Jul | 4.26 | 4.79 | 5.81 | 1.10 | 19.7 | 59 |
| Aug | 5.03 | 5.62 | 6.29 | 1.20 | 21.8 | 50 |
| Sep | 5.44 | 6.43 | 5.47 | 1.61 | 24.4 | 50 |
| Oct | 5.82 | 7.45 | 4.67 | 2.25 | 25.1 | 62 |
| Nov | 5.97 | 8.16 | 4.30 | 2.61 | 24.0 | 73 |
| Dec | 5.97 | 8.34 | 3.91 | 2.80 | 23.6 | 81 |
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 3.98 kWh/m²/day, 0.77 system efficiency.
About solar in Ribeirão Preto
Ribeirão Preto, Brazil has a warm, tropical climate with a distinct wet and dry season. Its annual peak sun hours average 5.24 kWh/m²/day, a excellent solar resource by global standards.
The strongest month in Ribeirão Preto is November (spring) at 5.97 kWh/m²/day, and the weakest is June (winter) at 3.98 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.
Ribeirão 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 Ribeirão Preto?
- Ribeirão Preto averages 5.24 peak sun hours per day annually, ranging from 3.98 in June to 5.97 in November.
- How many solar panels do I need in Ribeirão Preto?
- Panel count depends on your daily load. At Ribeirão Preto's annual average of 5.24 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 Ribeirão Preto?
- Sizing against Ribeirão Preto's worst month (June, 3.98 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 Ribeirão Preto's solar resource compare globally?
- Ribeirão Preto sits in solar zone 4 out of 5 (where 5 is strongest) at 5.24 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 Ribeirão Preto?
- Ribeirão Preto's dry-season output peaks at 5.97 kWh/m²/day in November; the wet season drops it to 3.98 in June. That ~38% swing is a key sizing consideration.
- Can solar panels survive tropical storms in Ribeirão 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 Ribeirão Preto?
- Ribeirão Preto swings from 5.97 kWh/m²/day in November (dry) to 3.98 in June (wet) — roughly 38%. Year-round off-grid systems must size against the wet-season minimum.