There is another type of tried and tested solar water pump which is quite capable of running in the dark without need for direct sunlight. They come in various shapes and forms depending on country of origin and water supply.
The ones we are most familiar with are called windmills. You may have seen one being destroyed in a truck commercial a few years ago.
Almost every farm used to have one. Many were located in remote locations for stock tanks.
These have their place but if you live in an area without proper wind supply the solar collector may be better.
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