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Solar System Calculator
System size, panel count, cost, payback period, and 25-year savings projection
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Energy Usage & Location
Accounts for inverter loss, wiring, shading, soiling
Battery Backup (Optional)
Solar System Sizing
Recommended System Size
7.6 kW
19 × 400W panels
Number of Panels
19
Est. Install Cost
$22,800
Annual Production
12,206 kWh
Annual Savings
$1,831
Payback Period
12.5 yrs
25-Year Net Savings
$22,971
Notes
Federal solar tax credit (ITC) may reduce install cost by 30% — not included in estimate.
Actual production varies by roof angle, azimuth, shading, and weather patterns.
Battery costs are not included in the install estimate — add $500–$1,000/kWh for lithium battery storage.
NEC 690 governs solar PV system installation. Consult local AHJ for permitting requirements.
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