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How Many Solar Panels Do I Need

Panels, system kW and roof area from usage.

Inputs

Inputs and assumptions

Metered kWh.

NREL NSRDB by ZIP.

100 = full offset.

400-460 typical.

Result

Panels needed
—
Roof area
—
System size
—

What to check

  • System size and site sun hours
  • Installer quote

Related calculators

Screening tool. Verify tariff, metering, NEC 690 and installer quotes.

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