ASTM technical subcommittee E44.09, titled Photovoltaic Electric Power Systems, has been actively involved in developing and revising industry‐consensus standards for photovoltaic measurements and characterization for both cells and modules since 1978. Current standards and draft documents fall into three categories: photovoltaic reference cell calibration, device and module characterization, and module environmental testing. This paper presents the current status of all E44.09 draft documents and standards and describes an interlaboratory comparison that is needed for reapproval of several existing standards. The interlaboratory comparison will be conducted during 1992.