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Open Roads Forum  >  Around the Campfire  >  General Topics

 > Electrical type question

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Tinstar

McKinney, TX

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Posted: 06/13/21 09:32am Link  |  Quote  |  Print  |  Notify Moderator

At my sticks and bricks, I have to replace a pool pump.

Which is more efficient to run (uses less electricity), a 2.5 HP pump drawing 6.3 amps or a 1 HP pump drawing 8 amps? They are both 120 volt. From what I can tell, the 2.5 HP is around 1800 watts and the 1 HP is around 750 watts. It just doesn't make sense to me that the 2.5 has lower amps and thus the reason for my question.

Thanks for any insight.

* This post was edited 06/13/21 09:50am by Tinstar *


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cougar28

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Posted: 06/13/21 11:11am Link  |  Quote  |  Print  |  Notify Moderator

I've sold and repaired thousand's in the course of 30 + years. Something is not right about those numbers. I've never seen a 2.5hp that was capable of being run on 115v or a 2hp for that matter. Is this a above ground pool?


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Tinstar

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Posted: 06/13/21 11:15am Link  |  Quote  |  Print  |  Notify Moderator

cougar28 wrote:

I've sold and repaired thousand's in the course of 30 + years. Something is not right about those numbers. I've never seen a 2.5hp that was capable of being run on 115v or a 2hp for that matter. Is this a above ground pool?


I don't know. Here's what the ad says.

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Posted: 06/13/21 11:36am Link  |  Quote  |  Print  |  Notify Moderator

There must be an error in the listing's specifications. 120V * 6.3A = 756W or about 1 HP. Somebody copied a wrong number somewhere. The AliExpress listing shows the same electrical specifications, but also a plug that is decidedly not a 120V plug (or at least one that I've ever seen).

In terms of electrical energy use, the actual power used will depend on the (mechanical) load on the pump, which in turn is determined by the sizes and lengths and arrangement of the pipes or hoses to and from the pump, the inlets and outlets in the pool, the speed and pressure of the water flow, the design of the pump itself, and probably a few other variables. I would not expect vast differences in overall efficiency assuming a similar flow rate; just because a motor is rated for 2.5 HP doesn't mean that it is always producing that amount of power, nor consuming the same amount of input power. In general, all other things being equal and assuming the power specifications are not inflated beyond all reason, the larger pump would pump water at a higher flow rate (and hence pressure), which means greater circulation but a little more loss due to friction, and so I'd expect it to be a little less efficient in practice (but give faster filtering/circulation).





Tinstar

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Posted: 06/13/21 12:12pm Link  |  Quote  |  Print  |  Notify Moderator

That's for the help guys. I ended up ordering a 1.5 HP name brand pump made more for my pool instead of the 2.5 HP on that has a confusing description.

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