Peak Sun Hours in Sahiwal, Punjab, Pakistan
- Solar zone
- Zone 3 (good)
- Best month
- May (6.9)
- Worst month
- December (2.9)
- Climate
- Arid · 27.1°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 2.92 | 3.49 | 2.84 | 1.43 | 13.4 | 39 |
| Feb | 4.11 | 4.59 | 3.84 | 1.79 | 16.8 | 39 |
| Mar | 5.34 | 5.82 | 4.50 | 2.18 | 23.1 | 34 |
| Apr | 6.40 | 6.90 | 5.04 | 2.58 | 29.7 | 27 |
| May | 6.86 | 7.24 | 4.78 | 2.95 | 35.5 | 21 |
| Jun | 6.33 | 6.91 | 3.63 | 3.24 | 37.8 | 29 |
| Jul | 5.68 | 6.34 | 2.59 | 3.14 | 36.7 | 41 |
| Aug | 5.56 | 6.22 | 3.05 | 2.86 | 35.3 | 44 |
| Sep | 5.37 | 5.72 | 4.03 | 2.30 | 32.4 | 42 |
| Oct | 4.51 | 4.63 | 3.82 | 1.98 | 27.7 | 29 |
| Nov | 3.41 | 3.58 | 3.25 | 1.59 | 21.0 | 29 |
| Dec | 2.89 | 3.19 | 3.11 | 1.35 | 15.4 | 33 |
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 2.89 kWh/m²/day, 0.77 system efficiency.
About solar in Sahiwal
Sahiwal, Pakistan has a dry climate with long hours of direct sunshine and low humidity. Its annual peak sun hours average 4.95 kWh/m²/day, a good solar resource by global standards.
The strongest month in Sahiwal is May (spring) at 6.86 kWh/m²/day, and the weakest is December (winter) at 2.89 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.
Sahiwal'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 Sahiwal?
- Sahiwal averages 4.95 peak sun hours per day annually, ranging from 2.89 in December to 6.86 in May.
- How many solar panels do I need in Sahiwal?
- Panel count depends on your daily load. At Sahiwal's annual average of 4.95 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 Sahiwal?
- Sizing against Sahiwal's worst month (December, 2.89 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 Sahiwal's solar resource compare globally?
- Sahiwal sits in solar zone 3 out of 5 (where 5 is strongest) at 4.95 kWh/m²/day — good by global standards. For reference, top-tier desert sites average ~6.5 and high-latitude cities around 2.5 kWh/m²/day.
- How often should I clean solar panels in Sahiwal?
- Arid climates can drop output 10–20% between cleanings. Quarterly cleaning is typical for Sahiwal; monthly during dust-storm seasons. Dew alone isn't enough when rainfall is infrequent.
- Does extreme heat hurt solar output in Sahiwal?
- Yes. Panel efficiency drops ~0.4% per °C above 25 °C cell temperature. In Sahiwal, midday cell temperatures of 55–70 °C can derate output 12–18% below nameplate.
- Is Sahiwal's solar resource as strong as the numbers suggest?
- Sahiwal's 4.95 kWh/m²/day is good globally. But heat derating and dust accumulation mean real-world yields typically land 10–15% below this headline figure — factor that into sizing.