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A VFD matched to a centrifugal pump can cut electricity use by 25 to 50 percent at part-load.
Centrifugal pumps follow the affinity laws — power varies with the cube of speed. A VFD that trims a pump from 50 Hz to 40 Hz for part-load duty can cut electricity use by roughly 50 percent at that operating point.
The payback on a VFD retrofit is typically two to four years for continuous-duty pumps in the 7.5 kW to 75 kW range.