Need a Deep Well Pump Solution [RE-wrenches]

[Windy Dankoff, Dankoff Solar]

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>Allen,
>If we can believe my Grundfos chart, the 5SQE O7B-320 is a 3/4HP 
>240vac pump which maxes out at 460'@1.6GPM. If you use the CU-300 
>pump controller and the R100 infared remote to set it up, you could 
>use that pump or maybe the larger 1 HP SQE10C-360 or 10C-410 pumps 
>and "dial them down" to 1 GPM.

The SQ pump has a centrifugal mechanism. If you "dial it down" 
(reduce its speed) to pump 1 GPM, the efficiency will be extremely 
low. In other words, it will use almost the same power as it would to 
pump 3 or 4 GPM, but for 3 or 4 times as long. The only reasonably 
efficient way to use it would be to let it pump faster, and utilize 
its auto shut-off periodically to let the well recover.

Solar pumps for high lift/low-flow (like SunRise and ETAPUMP) use 
positive displacement (not centrifugal) mechanism that doesn't lose 
efficiency when its pumping slowly.

Windy

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