Path-Q Solar

How much energy loss from partial shade can microinverters avoid compared with a string inverter?

Answer

There is no fixed percentage. Microinverters can limit the effect of a shaded panel on neighboring panels because each panel operates independently, but they cannot recover sunlight blocked from the shaded panel itself. The actual difference depends on shade timing, severity, which panels are affected, string layout, and whether a string inverter uses suitable tracking or module-level optimization.

Key points

  • A shaded panel loses its own potential production under any architecture.
  • In some string designs, mismatch can also reduce output from unshaded panels connected to the same string.
  • Microinverters may reduce that additional mismatch by allowing each panel to operate independently.
  • A time-based shade simulation is needed to quantify the annual difference.

What it depends on

  • Shade location, duration, and seasonal pattern
  • String grouping and inverter tracking behavior
  • Panel electrical characteristics
  • Microinverter, optimizer, and string-system specifications

Risks and trade-offs

  • Claims of a standard shade-loss reduction can be misleading without a site-specific model.
  • Module-level electronics may cost more and add distributed components.
  • Tree trimming or redesigning the array may provide more benefit than changing inverter architecture.

Information you may need

  • Time-based shade analysis
  • Panel layout and string diagram
  • Comparable production simulations
  • Equipment and installation price differences

Your next step

What to do next

Ask for annual production models for the proposed string and microinverter designs using the same shade assumptions, with the loss attributed to shade and mismatch separately.

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SQ01162