Dual DR's and submersibles[RE-wrenches]

[Windy Dankoff, Dankoff Solar]

<x-flowed>>This fall we looked into the Grundfos SQE series of deep well submersibles.
>Using permanent magnets and electronics, they have no surge. My 1/2 horse
>pump is rated at 9 amps. On start-up it ramps to 9 amps maximum delivering
>12gpm (at 30' head  into a 40psi. bladder tank). Since then we have done a
>number of deep well systems operating on the Exceltech 1100 by itself.

Barry,

Your system is reliable, and that is number one. It's a good way to 
pump water. I want to complete the perspective with my calculation of 
the efficiency of the system based on your data. Assuming 1:1 power 
factor (which is close, with the electronic motor), the efficiency of 
the pump is 26%. That's not including inverter loss.  That's 
relatively low but again, if it's reliable, it's viable. For people 
in a low-sun area who have substantial water needs, it would be 
economical to look at other options.

To find the formula for calculating efficiency, see 
www.dankoffsolar.com, Reference, Water Supply, Handy Facts and 
Formulae.

Windy

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