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Solar (PV) water pumping Practical Action Sizing solar pumps The hydraulic energy required (kWh/day) = volume required (m3/day) x head (m) x water density x gravity / (3.6 x 106) = 0.002725 x volume (m3/day) x head (m) The solar array power required (kWp) = Hydraulic energy required (kWh/day) Av. daily solar irradiation (kWh/m2/day x F x E) where F = array mismatch factor = 0.85 on average and E = daily subsystem efficiency = 0.25 - 0.40 typically Economics In general photovoltaic pumps are economic compared to diesel pumps up to approximately 3kWp for village water supply and to around 1kWp for irrigation. References Roy Barlow, Bernard McNelis and Anthony Derrick: Solar Pumping. An introduction and update on the technology, performance, costs and economics. IT Publications, 1993 Peter Fraenkel: Water Pumping Devices. A handbook for users and choosers. ITDG Publishing, 1997. Jeff Kenna and Bill Gillett: Solar Water Pumping. A handbook. IT Publications, 1985. U.R.S. Rentch: Solar Photovoltaics for Irrigation Water Pumping. SKAT, St. Gallen, 1982. Groundwater: Waterlines, Vol.20, No.2, October 2001, ITDG Publishing Useful addresses The International Solar Energy Society (ISES) International Headquarters Villa Tannheim, Wiesentalstr. 50, 79115 Freiburg, Germany. Tel: +49 - 761 - 45906-0 Fax: +49 - 761 - 45906-99 Email: hq@ises.org Web: http://www.ises.org/ International Centre for Application of Solar Energy (CASE) Level 8, 220 St Georges Terrace, Perth WA 6000, Australia. Tel: +61 (08) 9321 7600 Fax: +61 (08) 9321 7497 Email: info@case.gov.au Web: www.case.gov.au HTN/SKAT Vadianstrasse 42, CH-9000 St. Gallen, Switzerland. Tel: +41 71 228 54 54 Fax: +41 71 228 54 55 Email: info@skat.ch Web: http://www.skat.ch/htn Lifewater International 2840 Main Street, Morro Bay, CA 93442 Mailing address: PO Box 3131, San Luis Obispo, CA 93403, USA Tel: +1 805 772 0600, +1 888 543 3426 Fax: +1 805 772 0606 Email: info@lifewater.org Web: http://www.lifewater.org/ 8PDF Image | SOLAR (PHOTOVOLTAIC) WATER PUMPING
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