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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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