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  1. J

    Circulating Pump Motors Power Factors

    I have noticed recently that all the older type (induction motors?) have apparently very high power factors, these include Grundfos and Wilo and my old Salmson. For example, take a Wilo ST circ pump (~ 11 years old) powering my solar system, the PFs for the 3 speeds, starting at the lowest are...
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