Solar Panel Calculator
Calculate solar panel requirements, system size, costs, and savings for your home or business. Estimate ROI and energy production.
Step 1: Energy Needs & Location
Solar Panel Efficiency
Standard panels: 300-400W each, 18-22% efficiency. High-efficiency panels: 400-500W, 22-24% efficiency. Roof orientation affects output.
Step 2: System Specifications
System Components
A complete system includes: Solar panels, inverter(s), mounting hardware, wiring, monitoring system, and optional battery storage.
Solar System Estimate
Summary
Savings & ROI
Cost Breakdown
Total System Cost (Before Incentives)
$12,500.00
After incentives: $8,750.00
Solar Panels Needed
25 panels
System Size
8.25 kW
Annual Production
11,800 kWh
Monthly Savings
$135.00
Savings & Return on Investment
| Year | Energy Savings | Cumulative Savings | Payback Progress | ROI |
|---|
Cost Breakdown by Component
Solar Calculation Formula
Panels Needed = (Annual kWh Usage ÷ (Panel Wattage × Sun Hours × 365))
Calculate daily energy needs, divide by panel output, then add 10-20% for efficiency losses and future expansion.
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