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Solar powered pumps

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[[Image: solar pump icon.png|right|80px]]

[[Image:SolarGrid.jpg|thumb|right|200px|Kalalé District consists of 44 villages (~100,000 people), none of which are connected to the town of Benin’s electric power grid. They use solar instead. <br>Photo: [http://www.bobfreling.com/2009/08/solar-energy-powering-food-sec.htm Bob Freling's Solar Blog.]]]

With solar water systems the water is pumped during the peak sunshine hours of the day. It can be stored in a tank, and therefore it is not necessary to use batteries. The storage tank can be sized to provide some reserve during cloudy or rainy days. In sub-Saharan Africa the typical storage is about 3 to 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.

To properly size the size of solar panel(s) needed, refer to [http://artplatformwww.unicef.org/washsupply/UNICEF_WASH_Technology_webindex_54301.pdf html WASH Technology Information Packages], pages 130 & 131. Before that are great maps showing solar ranges and intensities in different regions of the world.

===Construction, operations and maintenance===

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