VS pump consumption measurements, I'm getting a weird result

[mas985]

10 amps at 230 volts is about 2300 watts.

2,300/941 = 2.44 times more power than required.

The numbers seem off to me.

Maybe you have the smaller impeller?

I doubt it or the other numbers would not be correct. By assuming the published head curve, the measured filter pressure is nearly the same as the calculated one based upon pipe length, fittings, filter, heater, eyeballs, everything in the plumbing loop so I think the head curve is correct.

Also, like I mentioned before, the measured data seems to match the Energy Star measurements for power fairly well and I am pretty sure the test were done with the stock impeller.

But this pump is not the only one that I have ran across where the actual power usage is well below the motor rating.

The Whisperflo VST has a HHP of 1.64 and a THP of 2.6.

1.64/2.6 = 63%.

But again, you don't know what BHP is.

Here is a comparison of several pumps using the Energy Star data. The last line is wire to water efficiency which can be calculated with the given information. In general, the larger THP pumps have better wire to water efficiency which is to be expected.

 

[JamesW]

The performance curve matches the SP2307X10 pump which is a 1.25 hp pump.

The power use seems more consistent with the 0.95 total hp pump.

Also, the 1.65 HP and the 0.85 HP have almost identical performance curves, which is strange.

Maybe they both use the SPX2707CM Impeller?

Maybe check your impeller to see which one you have.

https://hayward.com/media/akeneo_connector/asset_files/1/0/1011781_RevA_9337.pdf

https://hayward.com/media/akeneo_connector/asset_files/I/S/IS2300_RevE_d94c.pdf

https://hayward.com/media/akeneo_connector/asset_files/M/a/MaxFloXL_SellSheet_LITMAXFLXL18_de61.pdf

https://hayward.com/media/akeneo_connector/asset_files/M/a/MaxfloXL_IS2300_a7ff.pdf

MaxFlo XL, High Efficiency Pump, 1HP

Hayward MaxFlo® XL high efficiency pumps are for entry-level applications providing advanced hydraulics while maintaining the economy and performance of the proven MaxFlo family.

hayward.com

 

[JamesW]

Getting back to the original question, I suspect that it might be a change in power factor, but I do not know for sure.

Maybe a system issue, but that should be apparent from a pressure gauge.

You can get a multimeter that measures power factor, but it's probably not worth the effort unless you just really want to know.

Maybe the efficiency changes somehow.

Ask Pentair to see what they say.

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