4. During Installation

 This chapter outlines the tasks to be performed, from selecting the position of the photovoltaic water pumping system (PVWPS) up to it becomes operational. Calculations and computing draw on data collected at the before stage as well as new physical, environmental, technical and population information gathered during the current stage. The chapter provides an overview of the PVWPS deployment procedure, followed by a detailed account of how to produce accurate estimates for the quantities of water that would be required, a key input for system sizing. It describes geophysical tests, the technique for borehole drilling and physical–chemical tests. The authors discuss the size of PVWPS components, such as the PV modules and the water tank, to meet water demand while preserving groundwater resources. The selection of PVWPS components, system building, and further water bacteriological tests, all undertaken prior to opening the new water source to consumers, are also presented. Finally, the chapter details how to compute the system cost using specific local data.