E3A Solar Electricity: System Sizing

Editor’s note
The following abstract describes a publication that is only available as a PDF via the “Download this publication” button.

CoverDeveloped by Montana State University Extension and the University of Wyoming
Adapted with permission

This guide is one in the Exploring Energy Efficiency and Alternatives (E3A): Solar Electricity for the Home, Farm or Ranch series. This one provides guidance for determining the correct size for your system.


  • Solar electric photovoltaic (PV) system worksheet
  • Solar radiation U.S. map
  • Solar radiation data for flat-plate collectors and panels


  • 4