PVWatts Version 5 Manual

Aron Dobos

Research output: NRELTechnical Report


The NREL PVWatts 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 includes several built-in parameters that are hidden from the user. This technicalreference describes the sub-models, documents assumptions and hidden parameters, and explains the sequence of calculations that yield the final system performance estimate. This reference is applicable to the significantly revised version of PVWatts released by NREL in 2014.
Original languageAmerican English
Number of pages20
StatePublished - 2014

NREL Publication Number

  • NREL/TP-6A20-62641


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


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