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In this article, the behaviors of both flow and generated output of photovoltaic pump, the characteristics of both water pumping efficiency and output frequency, and the feature of charge capacity in accumulators have been tested through experiments, based on the integrated application system for water pumping, energy storage and illumination by photovoltaic pump, and in combination with composition and operation performance of photovoltaic water pumping system. According to the experimental results and under a constant delivery head, the photovoltaic pump and accumulator energy storage system with a total measured power of 1.8375 kWp in a photovoltaic array produces a daily water output of 13.1 m 3 and an average water output of 1.93 m 3 /h; the maximum water pumping efficiency of the system is 12.7% and the average water pumping efficiency is 11.1%; meanwhile, the energy storage capacity of accumulators by charging in three time periods throughout a day is 1.01 kWh, which accounts for about 9.72% of the photovoltaic array's all-day generated energy, namely 10.3 kWh. Those conclusions have certain practical implications for the optimal configuration of photovoltaic water pumping system.
Wang et al. (Tue,) studied this question.