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See also   Pumping Configuration, previous  and next Regulation.

This is an improvement of the Direct coupling configuration, often necessary with DC displacement pumps:

Most displacement pumps require a significant peak of current (at low voltage) when starting, in order to overcome the internal friction forces. We see on the PV characteristics diagram that the array current is not able to provide the peak unless by waiting very high insolation, increasing the irradiance threshold. Help is usually provided by an electronic device named "Booster", which stores the PV energy in a big capacity and gives it back as a peak of current.

This strategy is useable with a single pump system. When several pumps are involved in the system, the Cascade configuration is best suited.