Peak Sun Hours in Garhi Khairo, Sindh, Pakistan
- Solar zone
- Zone 4 (excellent)
- Best month
- May (7.3)
- Worst month
- December (3.6)
- Climate
- Arid · 29.1°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 3.76 | 4.06 | 4.36 | 1.49 | 15.5 | 29 |
| Feb | 4.62 | 5.07 | 4.75 | 1.76 | 19.1 | 28 |
| Mar | 5.79 | 6.28 | 5.22 | 2.16 | 25.4 | 25 |
| Apr | 6.76 | 7.21 | 5.38 | 2.56 | 31.9 | 20 |
| May | 7.32 | 7.71 | 5.41 | 2.84 | 37.3 | 18 |
| Jun | 7.15 | 7.45 | 4.52 | 3.19 | 39.4 | 27 |
| Jul | 6.32 | 6.75 | 2.97 | 3.38 | 38.8 | 36 |
| Aug | 6.17 | 6.62 | 3.58 | 3.01 | 37.1 | 39 |
| Sep | 6.01 | 6.24 | 4.76 | 2.40 | 34.7 | 33 |
| Oct | 5.36 | 5.47 | 5.54 | 1.80 | 29.6 | 20 |
| Nov | 4.14 | 4.29 | 4.88 | 1.48 | 22.9 | 23 |
| Dec | 3.61 | 3.81 | 4.69 | 1.31 | 17.2 | 26 |
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 3.61 kWh/m²/day, 0.77 system efficiency.
About solar in Garhi Khairo
Garhi Khairo, 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 Garhi Khairo is May (spring) at 7.32 kWh/m²/day, and the weakest is December (winter) at 3.61 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.
Garhi Khairo'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 Garhi Khairo?
- Garhi Khairo averages 5.58 peak sun hours per day annually, ranging from 3.61 in December to 7.32 in May.
- How many solar panels do I need in Garhi Khairo?
- Panel count depends on your daily load. At Garhi Khairo'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 Garhi Khairo?
- Sizing against Garhi Khairo's worst month (December, 3.61 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 Garhi Khairo's solar resource compare globally?
- Garhi Khairo 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 Garhi Khairo?
- Arid climates can drop output 10–20% between cleanings. Quarterly cleaning is typical for Garhi Khairo; monthly during dust-storm seasons. Dew alone isn't enough when rainfall is infrequent.
- Does extreme heat hurt solar output in Garhi Khairo?
- Yes. Panel efficiency drops ~0.4% per °C above 25 °C cell temperature. In Garhi Khairo, midday cell temperatures of 55–70 °C can derate output 12–18% below nameplate.
- Is Garhi Khairo's solar resource as strong as the numbers suggest?
- Garhi Khairo'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.