watt

[JamesW]

As best as I can tell, the scrolling dots are the Digital Power Indicator, which is a simulated disk. One cycle seems to represent 1 kWh. I think that you need to time the scrolling dots for one full cycle. Based on the times you provided, it looks like the difference is 41.75 kW, which doesn't match your pump size.

The DPI makes one revolution for each Kh of metered energy.
http://lib.store.yahoo.net/lib/wind-sun ... manual.pdf

Note: The manual says Kh, but I think they mean kWh.

[edit]Kh is a constant that means "Watthours per revolution". I'm not sure that it's clear what your Kh is. It would probably be helpful to ask the power company what the Kh is and what constitutes a revolution.[end edit]

 

[engrav]

As best as I can tell, the scrolling dots are the Digital Power Indicator, which is a simulated disk. One cycle seems to represent 1 kWh. I think that you need to time the scrolling dots for one full cycle. Based on the times you provided, it looks like the difference is 41.75 kW, which doesn't match your pump size.

The DPI makes one revolution for each Kh of metered energy.
http://lib.store.yahoo.net/lib/wind-sun ... manual.pdf

Note: The manual says Kh, but I think they mean kWh.

Hi

kh on the meter (see pics) is indicated to be 0.6, so I think one cycle is 0.6, not 1kwh
also on the meter it is handwritten to multiply by 80 (see pics)
and in thread above, one full cycle with pump on was 74 seconds, with pump off was 8 minutes
3600 * 1(cycle) / 74 (seconds) * 0.6 (kh) * 80 (multiplier) = 2.3 kwh / hr and pump is 2300 watts
Puget Sound Energy person did the same and said 3.5 kwh/ hr but JamesW above said not valid, could be he did not multiply by 0.6 as on the meter

may be time to wait for electrician

 

[JamesW]

((3600 x 0.6)/ 74) x 80 = 2335 Watts with pump on.
((3600 x 0.6)/522) x 80 = 331 Watts with pump off.
2335 - 331 = 2004 watts, which seems somewhat possible. Since it's a digital meter, it would seem that they could just display the amount of power being used without making people work so hard to try to figure it out. It's also important to make sure that the pump power is the only difference in the test. For example, if a refrigerator compressor turns off or on during the test, then the results won't be accurate.

You can get an ammeter for about $10.00.

This would give you a pretty good idea of what your motor is using. I think that the Power Factor should be between 0.85 and 1.0. You could contact Pentair to find out for sure.

Pentair does show the WFE 4 amps at full load at 7.4 amps at 230 volts. That equates to 1,700 watts (1.7 kWh/h).
http://www.pentairpool.com/pool-owner/p ... mp-193.htm

 

[engrav]

Ok, end of this saga / thread

electrician here today, directly measured amps drawn by the pump, found to be 7.3
so then 240v * 7.2a = 1752 watts from the WhisperFlo
that is 1.752 kWh/h, then *6 hrs pump time q day and *30 days q month is 315kwh / mo and at 10cents per, $31.50 q mo (over, out, done)

ah er, I lied
So then why did the "count the beats" method on the meter (see http://michaelbluejay.com/electricity/measure.html) return 2160 watts? Well, hidden in the unoccupied house are things drawing power, about 400 watts. And about 2100 minus about 400 is about 1700. And what are these things? Well for example a computer and router in the basement. Etc.

So WhisperFlo WFE4 is about 1700 and out here about $30 q month.

Now then over, out, done. At least on this. Thank you.

 

[JamesW]

Thanks for the update.