Pakistan Mein Solar System Lagane Se Pehle Units Ka Hisab Samajhna Kyun Zaroori Hai?
Pakistan mein bijli ke barhte huay tariffs (Rs 42 se Rs 55/unit) ki wajah se lakhoon gharelu sarfeen (domestic consumers) solar systems ki taraf muntaqil ho rahe hain. Lekin aksar logon ko yeh andaza nahi hota ke **unke ghar ke load ke liye kitne kilowatt (kW) ka system zaroori hai** aur **system mahana kitne units generate karega**.
Solar vendors aksar ideal calculations batate hain jo garmiyon aur sardiyon ke mausam mein farq karti hain. Is guide mein hum NEPRA regulations aur Pakistan ke mousmi halaat ke mutabiq practical unit generation aur rupee savings ka mukammal hisab samjhayenge.
1. Solar Generation Ka Basic Formula (Sun Hours Rule)
Pakistan mein dhoop (solar irradiance) dunya ke behtareen khitton mein shumar hoti hai. Ek on-grid ya hybrid system saal ke ausat (annual average) par mandarja zail formula ke mutabiq units generate karta hai:
$$\text{Daily Units} = \text{System Capacity (kW)} \times \text{Peak Sun Hours} \times \text{Performance Ratio (0.80)}$$
2. 3kW, 5kW, Aur 10kW System Ka Generation & Savings Table
| System Size | Average Daily Units | Mahana Units (30 Din) | Estimated Mahana Bachat (PKR) | Ideal Household Load |
|---|---|---|---|---|
| 3 kW | 11 – 13 Units | 330 – 390 Units | Rs 14,000 – 17,000 | 1 Inverter AC (Daytime) + Fridge + Fans |
| 5 kW | 18 – 22 Units | 550 – 660 Units | Rs 24,000 – 29,000 | 2 Inverter ACs + Water Motor + Full Home |
| 7 kW | 26 – 31 Units | 780 – 930 Units | Rs 34,000 – 41,000 | 2–3 ACs + Freezer + Heavy Daytime Load |
| 10 kW | 38 – 45 Units | 1,150 – 1,350 Units | Rs 50,000 – 62,000 | 3–4 ACs + Complete Double Storey Villa |
*Note: Agar aap live apne ghar ke units aur sheher ke hisab se exact payback calculate karna chahte hain, to hamara free [Solar Net Metering Calculator](/tools/solar-net-metering-calculator) use karein.*
3. Daytime Self-Consumption vs NEPRA Green Meter Export
Pakistani consumers ke liye sab se ahem nukta yeh hai ke:
**"Din ke waqt solar bijli ko ghar mein direct istemal karna, grid ko bechne se ziada faida mand hai!"**
A. Self-Consumption (Direct Bachat):
Jab aap dopahar 12 baje solar par AC chalate hain, to aap grid ka full retail rate (**Rs 44/unit**) bachate hain.
B. Grid Export (NEPRA Buyback Credit):
Jab aap ghar mein bijli use nahi kartay aur excess units green bidirectional meter ke zariye K-Electric ya LESCO ko wapis bhejte hain, to NEPRA aapko national basket buyback rate (**taqreeban Rs 21–22/unit**) credit karta hai.
Is liye aqalmand sarfeen din ke waqt solar hours mein heavy load (jaise pani ki motor, washing machine, aur air conditioners) chalate hain taake maximum units Rs 44 ke rate par bach sakein.
4. Green Meter Reading Disputes Se Kaise Bachein?
Green bidirectional meters par do readings aati hain:
Aksar meter readers export reading note karne mein ghalti kar dete hain jiski wajah se bill mein credit units kam darj hotay hain.
Solution:
Har mahine meter reader ke aane par **[Read Meter PWA](https://www.readmeter.online)** camera scanner se apne green meter ke Import aur Export dono dials ki photo capture karein. System timestamped record save kar leta hai jo kisi bhi billing dispute mein K-Electric ya WAPDA ke samne saboot ke tor par pesh kiya ja sakta hai.