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Solar (PV) water pumping Practical Action Motor pump/ Configuration Output (m3.day) @ 5kWhm/cu.m/ day insolation Head (m) Solar Array (Wp) System Price US$ FOB Submerged borehole motor pump 40 25 20 20 1200 800 7000-8000 6000-7000 Surface motor/ submerged pump 60 7 840 5000-6000 Reciprocating positive displacement pump 6 100 1200 7500-9000 Floating motor/pumpset 100 10 3 3 530 85 4000 2000 Surface suction pump 40 4 350 3000 Table 3: Photovoltaic pumping system specifications Procurement Assessing requirements The output of a solar pumping system is very dependent on good system design derived from accurate site and demand data. It is therefore essential that accurate assumptions are made regarding water demand/pattern of use and water availability including well yield and expected drawdown. Domestic water use per capita tends to vary greatly depending on availability. The long-term aim is to provide people with water in sufficient quantities to meet all requirements for drinking, washing and sanitation. Present short-term goals aim for a per capita provision of 40 litres per day, thus a village of 500 people has a requirement of 20 cubic metres per day. Most villages have a need for combined domestic and livestock watering. Irrigation requirements depend upon crop water requirements, effective groundwater contributions and efficiency of the distribution and field application system. Irrigation requirements can be determined by consultation with local experts and agronomists or by reference to FAO document 'Cropwater requirements' (J Dorrenbos, WO Pruitt - FAO, Rome, Italy - 1977). Assessing water availability Several water source parameters need to be taken into account and where possible measured. These are the depth of the water source below ground level, the height of the storage tank or water outlet point above ground level and seasonal variations in water level. The drawdown or drop in water level after pumping has commenced also needs to be considered for well and borehole supplies. This will depend on the ratio between pumping rate and the rate of refill of the water source. The pattern of water use should also be considered in relation to system design and storage requirements. Water supply systems should include sufficient covered water storage to provide for daily water requirements and short periods of cloudy weather. Generally, two to five days water demand is stored. 7PDF Image | SOLAR (PHOTOVOLTAIC) WATER PUMPING
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