Can batteries be used in water pumping systems?
While batteries may seem like a good idea, they are expensive (a battery bank can double the cost of the system) and have a number of disadvantages in pumping systems. They reduce the efficiency of the overall system because you do get get back all the energy you store in a battery and they require periodic replacement. Batteries also require additional maintenance and under and over-charge protection circuitry which adds to the cost and complexity of a given system. For these reasons, only about five percent of solar pumping systems employ a battery bank and are generally used in household situations that require water pressure at night for showering, bathrooms etc.
