The presented test facility is a compact, flexible, and easily handled tool to examine photovoltaic water pumping systems under varying conditions. The method is suitable for long-term tests of complete systems, as well as for measurements of the characteristics of single components. Using the equipment standardized test procedures are possible. This would lead to comparable results for different systems. For system designers the test facility may be an instrument to check the effect of system modifications. So far, only centrifugal pumps were considered. For investigations of volumetric pumps some modifications will be necessary.