摘要： Photovoltaic water pumping systems are available as kits to supply water where the grid does not go. These kits usually are made by multinationals and based on specific components, making the most of small and very small companies, who usually install these systems, dependent on others. Thankfully these companies can develop their own solutions with standard frequency converters and AC pumps. An alternative is to connect the standard frequency converters to a photovoltaic string with a DC voltage of the order of some hundreds of volts. This implies in more than 2kW of power installed. For many applications, more than 2kW would be oversized. This paper presents a review of photovoltaic water pumping systems based on standard frequency converters and proposes new approaches for low power applications requiring only up to four modules. These approaches are being investigated and evaluated in cooperation with a company.