Q: how do i ensure that i also have water when the sun does not shine?

A: Normally, a storage tank is integrated in the design of a solar water pumping system. The storage tank acts as a “battery”. When the sun shines, the tank is filled up, when it is cloudy or dark, water can be used from the tank which is placed at a high point. It is also possible to include a battery in a solar water pumping system.

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