Solar System Sizing Calculator
Estimate grid-sizes, backup layout, panels & investment saving metrics based on electricity bills.
Quick Sizing Benchmark for Pakistan
In Pakistan's solar irradiation conditions, 1 kW of installed solar capacity yields ~4.2 kWh (units) daily (~125 units/month). A standard 5 kW system generates ~625 units/month and requires ~320 sq ft of unshaded roof area; a 10 kW system generates ~1,250 units/month and requires ~640 sq ft. Typical return on investment (ROI) is achieved within 2.2 to 3.0 years under current NEPRA slab rates.
System Input Parameters
Monthly Electricity Bill
PKR 35,000
PKR 5,000
PKR 200,000
Required Backup Hours
4 hours
No backup
12 hours
🔔 Pakistan Slab Index: Average Wapda multi-unit slab rate is PKR 58/unit. System sizing is optimized for this baseline.
Recommended System Configuration
System Size
5 kW
Solar Panels
9
575W Jinko Tiger Neo
Inverter
5kW Hybrid
Batteries
1 x Lithium
Estimated Total Cost
PKR 850,000
Monthly Savings
PKR 31,500
ROI Payback Period
2.2 years