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Solar (PV) water pumping Practical Action Applications Solar pumps are used principally for three applications: • village water supply • livestock watering • irrigation A solar pump for village water supply is shown schematically in Figure 1.With village water supply, a constant water demand throughout the year occurs, although there is need to store water for periods of low insolation (low solar radiation). Typically in Sahelian Africa the storage would be 3-5 days of water demand. In environments where rainy seasons occur, rainwater harvesting can offset the reduced output of the solar pump during this period. The majority of the 6000 or more solar pumping systems installed to date are for village water supply or livestock watering. Figure 1: Village water supply A solar irrigation system (Figure 2) needs to take account of the fact that demand for irrigation water will vary throughout the year. Peak demand during the irrigation seasons is often more than twice the average demand. This means that solar pumps for irrigation are under-utilised for most of the year. Attention should be paid to the system of water distribution and application to the crops. The system should minimise water losses, without imposing significant additional head on the pumping system and be of low cost. 2PDF Image | SOLAR (PHOTOVOLTAIC) WATER PUMPING
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