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I didn't know that but it kind of makes sense. Someone recently discovered here on the forum that the old thumbrule about undersized motors (let's say drawing 50-80% of full load) being less efficient than fully loaded motors no longer seemed to work. When we tried it out with some typical data sheets (new motors around 10hp as I recall), even the 50% loaded larger motor was more efficient than the 100% loaded smaller motor. For both old and new motors the larger motor is obviously more efficient at 100% load. But apparently (?) there is no longer so much drop between full load and 50%, that would explain the observation about the thumb rule no longer valide. (I realize data sheets are the only way to really answer the question, but it's nice to have a general feel.)On older motors, the efficiency curves were sometimes relatively steep with loading, i.e. the efficiency dropped maybe 10% between full load and half load. But on newer energy efficient motors that is no longer the case, there is barely a few percent difference any more