Solar Panel Calculator
Calculate solar panel requirements based on your electricity consumption and roof space
Electricity Consumption
Your average monthly electricity bill amount
Average cost per unit of electricity in your area
Consumption: 500 kWh/month
Daily usage: 16.67 kWh/day
System Configuration
Average peak sunlight hours in your location
Overall system efficiency including losses
Config: 540W panels, 5h sun, 80% efficiency
Required system: 4.17 kW (8 panels)
System Requirements
System Size
4.17 kW
To meet your electricity needs
Number of Panels
8
Panel Wattage
540W
Space Requirements
Roof Area Required
168 sq ft
Minimum rooftop space needed
Area per Panel
21 sq ft
Panel Layout
3×3
Cost Estimate
Total System Cost
₹2,79,167
₹67 per watt (including installation)
Cost per kW
₹67,000
Payback Period
7.75 years
Energy Analysis
Monthly Consumption:500 kWh
Daily Consumption:16.67 kWh
Daily Generation:16.68 kWh
Monthly Bill:₹3,000
Annual Savings:₹28,800
System Overview
Solar system specifications for 500 kWh monthly consumption
How Solar Panel Calculation Works
Consumption Analysis
Monthly consumption = Bill amount ÷ Electricity rate = ₹3,000 ÷ ₹6/kWh = 500 kWh
Daily consumption: 500 kWh ÷ 30 days = 16.67 kWh/day
System Sizing
System size = Daily consumption ÷ (Sunlight hours × Efficiency) = 16.67 ÷ (5 × 80%) = 4.17 kW
Number of panels = System size ÷ Panel wattage = 4.17 kW ÷ 0.54 kW = 8 panels
Space & Cost
Roof area = Number of panels × Area per panel = 8 × 21 sq ft = 168 sq ft
Total cost = System size × Cost per watt = 4.17 kW × ₹67,000/kW = ₹2,79,167
Energy Generation
Daily generation = System size × Sunlight hours × Efficiency = 4.17 kW × 5h × 80% = 16.68 kWh/day
Payback period = System cost ÷ Annual savings = ₹2,79,167 ÷ ₹36,000 = 7.75 years
Solar Panel Technology Comparison
Panel Efficiency:
- • 330W: Standard efficiency, lower cost
- • 445W: High efficiency, good value
- • 540W: Premium efficiency, space-saving
- • 665W: Latest technology, maximum power
System Optimization:
- • Higher wattage panels = fewer panels needed
- • Less roof space required with efficient panels
- • Consider shading and roof orientation
- • Factor in local sunlight hours and weather
Your System Recommendation:
Bill: ₹3,000/month
Consumption: 500 kWh
System: 4.17 kW
Panels: 8 × 540W
Area: 168 sq ft
Cost: ₹2,79,167
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