<P> A photovoltaic solar powered pump system has three parts: </P> <Ul> <Li> solar panels . </Li> <Li> the controller </Li> <Li> the pump </Li> </Ul> <Li> solar panels . </Li> <P> The solar panels make up most (up to 80%) of the systems cost . The size of the PV - system is directly dependent on the size of the pump, the amount of water that is required (m3 / d) and the solar irradiance available . </P>

The diagram shows how a solar powered water pump works