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SESK: Stuff Everyone Should Know · sesk.info/solar-string-shade

With a string inverter, what happens if one panel on the string is shaded?

Production on the whole string drops.

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  1. Only that panel is affected
  2. The inverter shuts down the house
  3. Output of the whole string is reduced ✔

Why: A string inverter connects a set of panels in series. One weak panel holds back the others on that string.

Huh, didn't know that: Despite the shading drawback, DOE describes the string inverter setup as cost-effective.

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Why is the sun always very mad at the clouds? They just keep throwing shade.
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References

Answer: Output of the whole string is reduced. A string inverter connects a set of panels in series. One weak panel holds back the others on that string.

  1. DOE: Solar Integration, Inverters and Grid Services Basics www.energy.gov/eere/solar/solar-integration-inverters-and-grid-services-basics
    results in reduced power production on the string if any individual panel experiences issues, such as shading
    Checked 2026-10-10.
  2. DOE: Solar Integration: Inverters and Grid Services Basics www.energy.gov/eere/solar/solar-integration-inverters-and-grid-services-basics
    That inverter converts the power produced by the entire string to AC. Although cost-effective
    Checked 2026-10-10.

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