SOLAR CALCULATOR

Solar Sizing Estimator

State (US)

Sets a reasonable default for sun hours.

ZIP (US)

Refines sun-hour guess (coarse). You can override.

Sun hours (avg/day) System derate (overall)

Temp, wiring, inverter, soiling, etc.

Monthly bill ($) Utility rate ($/kWh)

Target offset (% of usage) DC:AC ratio (for inverter)

System cost ($/W DC) Incentives (% off upfront)

e.g., federal ITC 30% (excludes SRECs).

Panel wattage (W) Panel area (sq ft each)

Typical 72/144-cell ≈ 21.3 sq ft.

Results

Recommended size (DC)

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Est. annual production

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Panels (approx)

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Roof area needed

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Inverter (AC, cont.)

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Annual bill savings

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Net cost (after incentives)

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Simple payback

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Offset (%)

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