1/4 the HP requirement is very different than 1/4 the power use. Measure the power you will find 1/4 HP requirement requires 3/4 of the wattage of a single speed motor of the same HP. 1HP = 746W, a real world single speed PSC motor will use about 900W at full load. A 2 speed motor will use 950W on high (1HP), 650W on low (1/3HP). ECM will use 850W on high, 275W on low. It's best to measure your actual motor on both speeds since load vs. rated HP varies considerably.
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