Photovoltaic Module Energy Rating Procedure: Final Subcontract Report

Benjamin Kroposki, Ben Kroposki (NREL Technical Monitor)

Research output: NRELSubcontract Report


This document describes testing and computation procedures used to generate a photovoltaic Module Energy Rating (MER). The MER consists of 10 estimates of the amount of energy a single module of a particular type (make and model) will produce in one day. Module energy values are calculated for each of five different sets of weather conditions (defined by location and date) and two load types.Because reproduction of these exact testing conditions in the field or laboratory is not feasible, limited testing and modeling procedures and assumptions are specified.
Original languageAmerican English
Number of pages126
StatePublished - 1998

Bibliographical note

Work performed by Endecon Engineering, San Ramon, California

NREL Publication Number

  • NREL/SR-520-23942


  • module energy rating
  • module performance
  • photovoltaics (PV)


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