The socio-economic development of isolated regions is dependent on two main factors, which are access to electricity and water for domestic purposes and irrigation. In the absence of access to the mains electricity, solar energy can be used to advantage, in particular for pumping water for irrigation. This natural resource, scarce in some places, but abundant in Huambo (Angola) allows us to admit that its use by small and medium farmers, if well managed, may increase production levels and, consequently, the income of local producers. Refer to the advantages and disadvantages, from the environmental and economic point of view of solar energy compared to conventional energy sources, and some photovoltaic systems for pumping water for irrigation (SFVR) are described. A case study involving the creation of a model installation of an SFVR located in the municipality of Chipipa, in the municipality of Huambo, is presented, having been pre-dimensioned analytically and using computer software (PVsyst 6.0. 1) and the results obtained by the two methods mentioned are compared.