[RE-wrenches] Design help for solar water pumping application

[Lee Bristol]

Solar Water Pumping Wrenches,

We normally don't do solar water pumping but a friend asked for some help
designing his system.  He has one well and two 5,000 gallon reservoirs to
fill up.  The average usage is expected to be about 2,000 gallons per day
but may be higher in the summer.  The tanks will have level detector
switches to sense when the tank is full.  The site is near Leesburg, VA.

The problem is to design a control system to turn on the pump when one or
both of the tanks needs water and to shut it off when both are full.  The
closest tank has a head requirement of 200 feet (pump to tank) and is 300
feet from the well head.  The second tank head requirement is 220 feet and
it is 3,000 feet from the well.  The pipes are expected to be 1.25 or 1.5
inch.

A Grundfos SQFlex 6 SQF-2 pump with 1.36 KW solar was recommended, 360 foot
head, 360 gph.  I think that this would provide the lift but not the
quantity.  Hmmmm, what valves and controls would you all suggest?

Thanks!
Lee

-- 
Lee Bristol
NABCEP Certified Solar Designer/Installer

Chief Technology Officer
Standard Solar, Inc.
202 Perry Parkway, #7
Gaithersburg, MD 20877
(301) 944-5105
(240) 479-1510 (c)
www.standardsolar.com
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