Peak Sun Hours in San Luis Potosí, San Luis Potosí, Mexico
- Solar zone
- Zone 4 (excellent)
- Best month
- May (7.0)
- Worst month
- December (4.1)
- Climate
- Temperate · 15.9°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 4.22 | 5.26 | 5.48 | 1.34 | 10.9 | 59 |
| Feb | 5.22 | 6.19 | 6.51 | 1.39 | 13.1 | 53 |
| Mar | 6.31 | 7.24 | 7.12 | 1.64 | 15.4 | 47 |
| Apr | 6.94 | 7.90 | 7.07 | 1.92 | 18.7 | 41 |
| May | 7.00 | 8.03 | 6.56 | 2.06 | 20.3 | 49 |
| Jun | 6.72 | 8.05 | 5.77 | 2.28 | 19.5 | 63 |
| Jul | 6.44 | 7.91 | 5.10 | 2.43 | 18.1 | 70 |
| Aug | 6.37 | 7.66 | 5.48 | 2.24 | 18.0 | 71 |
| Sep | 5.39 | 6.99 | 4.41 | 2.24 | 17.0 | 75 |
| Oct | 5.13 | 6.24 | 5.67 | 1.60 | 15.6 | 71 |
| Nov | 4.41 | 5.39 | 5.80 | 1.28 | 13.0 | 67 |
| Dec | 4.07 | 4.95 | 5.58 | 1.28 | 11.5 | 61 |
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 4.07 kWh/m²/day, 0.77 system efficiency.
About solar in San Luis Potosí
San Luis Potosí, Mexico has a temperate climate with meaningful seasonal variation in solar resource. Its annual peak sun hours average 5.69 kWh/m²/day, a excellent solar resource by global standards.
The strongest month in San Luis Potosí is May (spring) at 7 kWh/m²/day, and the weakest is December (winter) at 4.07 kWh/m²/day. When sizing a year-round off-grid system, it's standard practice to design against the December value rather than the annual average — otherwise the battery bank runs low during the darkest weeks.
San Luis Potosí'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 San Luis Potosí?
- San Luis Potosí averages 5.69 peak sun hours per day annually, ranging from 4.07 in December to 7 in May.
- How many solar panels do I need in San Luis Potosí?
- Panel count depends on your daily load. At San Luis Potosí's annual average of 5.69 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 San Luis Potosí?
- Sizing against San Luis Potosí's worst month (December, 4.07 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 San Luis Potosí's solar resource compare globally?
- San Luis Potosí sits in solar zone 4 out of 5 (where 5 is strongest) at 5.69 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 much does winter reduce solar output in San Luis Potosí?
- San Luis Potosí's worst month (December) delivers 4.07 kWh/m²/day — about 58% of the summer peak of 7. Off-grid systems here typically oversize 1.5–2× or pair with a backup source.
- Do cloudy days significantly affect San Luis Potosí's solar?
- Partly. Diffuse light still produces 10–25% of clear-sky output. San Luis Potosí's 5.69 kWh/m²/day already reflects average cloudiness, so no further derating is needed for sizing.
- What panel tilt works best in San Luis Potosí?
- At San Luis Potosí's latitude (22°), a fixed tilt near 22° balances year-round yield. Winter-heavy loads favor latitude + 15°; summer-heavy, latitude − 15°.