PVWatts Version 1 Technical Reference

Research output: NRELTechnical Report


The NREL PVWatts(TM) calculator is a web application developed by the National Renewable Energy Laboratory (NREL) that estimates the electricity production of a grid-connected photovoltaic system based on a few simple inputs. PVWatts combines a number of sub-models to predict overall system performance, and makes several hidden assumptions about performance parameters. This technical referencedetails the individual sub-models, documents assumptions and hidden parameters, and explains the sequence of calculations that yield the final system performance estimation.
Original languageAmerican English
Number of pages11
StatePublished - 2013

NREL Publication Number

  • NREL/TP-6A20-60272


  • photovoltaics (PV)
  • PV
  • PVWatts
  • solar analysis
  • systems modeling


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