Installing the right-sized solar system is crucial to ensure you meet your energy needs efficiently. Calculate your solar system requirement helps avoid overspending on oversized systems or facing shortages from undersized ones. In Pakistan, with rising electricity costs and frequent power outages, accurately sizing your solar setup is essential for maximum savings and reliability.

Steps to Calculate Your Solar System Requirement

1. Check Your Daily Energy Usage
   Review your electricity bills to determine your average daily energy consumption in kilowatt-hours (kWh). For example, if your monthly consumption is 900 kWh:

   900 ÷ 30 = 30 kWh per day

2. Determine Solar Irradiance in Your Area
   Solar irradiance indicates the average number of sunlight hours per day. Cities in Pakistan, like Islamabad and Lahore, receive about 5.5–6 hours of effective sunlight daily.

3. Estimate Solar System Capacity
   Divide your daily energy usage by average daily sunlight to determine the system size:

   30 kWh ÷ 5.5 hours = 5.45 kW

4. Account for System Losses
   Factors like shading, dirt, and equipment inefficiencies can reduce output. Adding a 25% buffer is recommended:

   5.45 × 1.25 ≈ 6.81 kW

   This means a 6.8 kW system would reliably meet your energy needs.

5. Calculate Number of Solar Panels
   If using 300-watt panels:

   6,800 ÷ 300 ≈ 23 panels

   So, around 23 panels are needed for the required system capacity.

Additional Considerations

• Roof Space: Ensure sufficient roof area for all panels. A 300-watt panel typically measures 1.7m × 1m.

• Battery Storage: For nighttime or power outage use, add batteries sized according to your consumption and backup needs.

• Inverter Selection: Choose an inverter that meets or slightly exceeds the system capacity for efficient energy conversion.

Conclusion

Properly sizing your solar system ensures cost efficiency, reliable energy supply, and long-term savings. By following these steps, you can calculate your solar system requirement for your home or business in Pakistan. For personalized guidance and installation, consult professional solar providers to optimize your investment.