Watts a horse power [RE-wrenches]

[Ray Walters]

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Hey Windy;

I thought I would jump on this dinner deal too.....I'll bring the porter 
ale.....


>As for the 1 HP SQ pump drawing 2400 watts, that sounds excessive. It's a 
>different motor technology but my impression is that the efficiency is 
>about the same as conventional pumps (after startup).

The  3" diam. SQ pumps are slightly less efficient than their 4 " cousins, 
at least according to Grundfos's design software that predicts annual 
energy use. That 2400 watt draw is close to the same DC number I saw with a 
1 Hp SQ at 350 ft to water and 40 psi. Inverter was an SW plus (Pyramid 
psuedo sine wave?).



>And Todd, yes, some drillers make a habit of putting an oversized pump in 
>the well. Besides some greed, they may actually feel that they are doing a 
>favor to the customer IN CASE of extraordinary circumstances. Some 
>customers love power !! They will take ASK for more if it doesn't cost 
>much or the driller just happens to have a bigger one on the shelf that 
>he's itchy to move.




We have several customers with deep wells that ended up with 3 Hp pumps. I 
like your V 8 macho American analogy.  We're going to try a pair of Outback 
inverters to run one, but most have been run on generators.



>I'll buy you dinner when I visit some time, but only if the SQ is still 
>working, and you buy the wine. The reliability of any electronic device is 
>reduced on mod-square. It will certainly run hotter, and components are 
>stressed by spikes and vibration. I'm sure you have heard the difference 
>in numerous loads -- buzzing noise from transformers, fluor lights, etc. 
>The risk may be minor, but only collective experience will tell.




We've run SQs on DR inverters also, so far so good. They've already stayed 
in the hole longer than a lot of  solar pumps of past experience, but the 
inefficiency begins weighing them down in systems that need more than a 
couple of hundred gallons/ day.

Much Bozo Honking,

Ray

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