Quote:
Originally Posted by mikluha
What could explain the situation is that Iwaki is overkill for a given situation. For example, it may produce 100 GPM of water with 10 psi of pressure (approximately, 23 ft of head). And DC pump has 100 GPM with 4.5 psi (10 ft). Different output power.
If your head pressure is only 10ft, then Iwaki shoots water out with extra 10ft of head (neglecting friction losses). If you don't need that extra power, then BLDC pump is sufficient and Iwaki is overkill.
However, it has nothing to do with pump efficiency. It just show miscalculated pump power
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BTW, I completely agree with this. I think in order to make a fairer comparison, one should be comparing to pumps designed to perform similar functions. So, pumps designed for flow rather than pressure. In the example from above, the PanWorld 50 comes in two models, a PX and a PXX. Both are essentially equivalent in terms of power but one flow much more water than the other. In most aquarium applications, the PXX will be viewed as much more efficient than the PX. So, I think it is much more about design and design goals than it is inherent AC/DC efficiency. Hells Bells!