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kW vs kWp: meaning in solar

A kWp rating is the power a solar array produces under standard test conditions, which is the figure on the module label added up across the array. A kW rating usually describes what an inverter can deliver. An array is sized in kWp and an inverter is sold in kW, and the two are often close but not equal.

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In more detail

Real sunlight and heat rarely match the test conditions, so an array seldom delivers its kWp rating. That gap is one reason the energy you can expect is worked out with a loss factor instead of the label figure.

A customer who hears one number for the array and another for the inverter can think the quotation is inconsistent. Saying which is which avoids the question.

Where it shows up in the app

A quotation takes one capacity in kilowatts. Decide whether you mean the array or the inverter, and say so in the module and inverter lines of the bill of materials.

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Common mistakes

  • Giving one number for two things

    A customer who hears one number for the array and another for the inverter can think the quotation is inconsistent.

  • Expecting the label figure in real output

    Real sunlight and heat rarely match the test conditions, so an array seldom delivers its kWp rating.

What to check before you send

  • You decided whether the capacity means the array or the inverter
  • The module and inverter lines of the bill of materials say which is which
  • Any energy estimate uses a loss factor instead of the label figure

Cite this page

Bharat Solar Venture. "kW vs kWp: meaning in solar." Bharat Solar Venture, last updated 11 Oct 2026. https://bharatsolarventure.in/glossary/kw-vs-kwp

Canonical URL: https://bharatsolarventure.in/glossary/kw-vs-kwp

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