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The Morningstar string sizing calculator is used to determine the number of PV modules you may use with any Morningstar controller while staying within the controller specs.

Recently Morningstar has updated their string calculator interface. Some of the new features include:

  • A new interface that displays additional information and specifications.
  • Additional sizing information and links to tech documents pertaining to marginal and oversizing results.
  • Printer friendly results for each of your specific configurations

To use the string size calculator please visit the Morningstar website available here.