Peak Sun Hours in Rahim Yar Khan, Punjab, Pakistan
- Solar zone
- Zone 4 (excellent)
- Best month
- May (7.2)
- Worst month
- December (3.6)
- Climate
- Arid · 28.4°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 3.75 | 4.07 | 4.53 | 1.40 | 15.2 | 32 |
| Feb | 4.72 | 5.08 | 5.11 | 1.67 | 18.7 | 31 |
| Mar | 5.96 | 6.28 | 5.79 | 2.00 | 25.0 | 28 |
| Apr | 6.83 | 7.11 | 5.64 | 2.45 | 31.3 | 23 |
| May | 7.19 | 7.38 | 5.00 | 2.94 | 36.5 | 21 |
| Jun | 6.90 | 7.17 | 4.26 | 3.12 | 38.2 | 31 |
| Jul | 6.45 | 6.82 | 3.76 | 3.06 | 37.6 | 39 |
| Aug | 6.26 | 6.72 | 4.50 | 2.58 | 35.8 | 43 |
| Sep | 5.99 | 6.19 | 5.38 | 2.07 | 33.7 | 37 |
| Oct | 5.26 | 5.32 | 5.67 | 1.65 | 29.2 | 24 |
| Nov | 4.10 | 4.22 | 4.89 | 1.44 | 22.6 | 25 |
| Dec | 3.59 | 3.79 | 4.74 | 1.26 | 17.0 | 29 |
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 3.59 kWh/m²/day, 0.77 system efficiency.
About solar in Rahim Yar Khan
Rahim Yar Khan, Pakistan has a dry climate with long hours of direct sunshine and low humidity. Its annual peak sun hours average 5.58 kWh/m²/day, a excellent solar resource by global standards.
The strongest month in Rahim Yar Khan is May (spring) at 7.19 kWh/m²/day, and the weakest is December (winter) at 3.59 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.
Rahim Yar Khan'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 Rahim Yar Khan?
- Rahim Yar Khan averages 5.58 peak sun hours per day annually, ranging from 3.59 in December to 7.19 in May.
- How many solar panels do I need in Rahim Yar Khan?
- Panel count depends on your daily load. At Rahim Yar Khan's annual average of 5.58 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 Rahim Yar Khan?
- Sizing against Rahim Yar Khan's worst month (December, 3.59 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 Rahim Yar Khan's solar resource compare globally?
- Rahim Yar Khan sits in solar zone 4 out of 5 (where 5 is strongest) at 5.58 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 often should I clean solar panels in Rahim Yar Khan?
- Arid climates can drop output 10–20% between cleanings. Quarterly cleaning is typical for Rahim Yar Khan; monthly during dust-storm seasons. Dew alone isn't enough when rainfall is infrequent.
- Does extreme heat hurt solar output in Rahim Yar Khan?
- Yes. Panel efficiency drops ~0.4% per °C above 25 °C cell temperature. In Rahim Yar Khan, midday cell temperatures of 55–70 °C can derate output 12–18% below nameplate.
- Is Rahim Yar Khan's solar resource as strong as the numbers suggest?
- Rahim Yar Khan's 5.58 kWh/m²/day is excellent globally. But heat derating and dust accumulation mean real-world yields typically land 10–15% below this headline figure — factor that into sizing.