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Performance ratio: meaning in solar

Performance ratio compares the energy a solar plant actually delivers with the energy it would deliver if it worked at its rated efficiency in the sunlight it received. It captures losses from heat, dust, wiring and the inverter. A higher ratio means the plant loses less on the way from panel to meter.

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In more detail

The ratio is always below one, because every real plant has losses. It lets you compare plants in different places, since it removes the effect of how sunny the site is.

A sizing estimate has to assume a ratio, because the real one is only known after the plant has run.

Where it shows up in the app

The app's size estimate and the free size calculator apply one fixed derating factor for these losses. The calculator page shows the value it uses, so it is not repeated here.

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Common mistakes

  • Expecting a ratio of one

    The ratio is always below one, because every real plant has losses.

  • Treating the estimate as the measured value

    A sizing estimate has to assume a ratio, because the real one is only known after the plant has run.

What to check before you send

  • The assumed derating factor is shown with the estimate
  • The customer knows the figure is an assumption
  • The figure comes from the size calculator, not from a number typed from memory

Cite this page

Bharat Solar Venture. "Performance ratio: meaning in solar." Bharat Solar Venture, last updated 11 Oct 2026. https://bharatsolarventure.in/glossary/performance-ratio

Canonical URL: https://bharatsolarventure.in/glossary/performance-ratio

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