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Because of the design, the ADD-A-PHASE® is not limited to just one motor. The ADD-A-PHASE® can be suited to accommodate as many as 5 or 6 motors. An example where multiple 3-phase motors would need to be operated would be on an HVAC unit. These units normally consist of compressors, condensers, indoor & outdoor fan motors which could all be 3-phase and need the ability to cycle on & off as needed. The advantage herein lies over a rotary phase converter. With each motor on a separate section of the multiple-motor ADD-A-PHASE®, sharing the same common autotransformer, the full load of the converter will only be used when the HVAC unit requires it. With a rotary converter, the base unit must continually run whether all motors are operating or just one.