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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi Lee, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I would think a “snap-shut”
valve, such as a <st1:place w:st="on"><st1:City w:st="on">Hudson</st1:City></st1:place>
valve in each tank and a pressure switch hooked up to the float terminals on
the controller would work well in this situation.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Good luck!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face="Comic Sans MS"><span
style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'>Mark Dickson</span></font><font
color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face="Comic Sans MS"><span
style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'>Oasis Montana
Inc.</span></font><font color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face="Comic Sans MS"><span
style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'><a
href="http://www.oasismontana.com/" target="_blank"></a><a
href="http://www.oasismontana.com/" target="_blank"><font color="#497699"><span
style='color:#497699'>www.oasismontana.com</span></font></a></span></font><font
color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#497699" face="Comic Sans MS"><span
style='font-size:10.0pt;font-family:"Comic Sans MS";color:#497699'><a
href="http://www.grid-tie.com/" target="_blank">www.grid-tie.com</a></span></font><font
color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face="Comic Sans MS"><span
style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'><a
href="http://www.pvsolarpumps.com/" target="_blank"></a><a
href="http://www.pvsolarpumps.com/" target="_blank"><font color="#497699"><span
style='color:#497699'>www.PVsolarpumps.com</span></font></a> </span></font><o:p></o:p></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Lee Bristol<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, June 11, 2009 1:26
PM<br>
<b><span style='font-weight:bold'>To:</span></b>
RE-wrenches@lists.re-wrenches.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [RE-wrenches] Design help
for solar water pumping application</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Solar Water Pumping Wrenches,<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>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 <st1:place w:st="on"><st1:City w:st="on">Leesburg</st1:City>, <st1:State
w:st="on">VA.</st1:State></st1:place><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>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.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>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?<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Thanks!<br clear=all>
<o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Lee<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
-- <br>
Lee Bristol<br>
NABCEP Certified Solar Designer/Installer<br>
<br>
Chief Technology Officer<br>
Standard Solar, Inc.<br>
<st1:Street w:st="on"><st1:address w:st="on">202 Perry Parkway, #7</st1:address></st1:Street><br>
<st1:place w:st="on"><st1:City w:st="on">Gaithersburg</st1:City>, <st1:State
w:st="on">MD</st1:State> <st1:PostalCode w:st="on">20877</st1:PostalCode></st1:place><br>
(301) 944-5105<br>
(240) 479-1510 (c)<br>
<a href="http://www.standardsolar.com">www.standardsolar.com</a><o:p></o:p></span></font></p>
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