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<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>Lee,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>You can get Grundfos’ WINCaps
software from your RE or pump supplier; some will run the sizing for you
(Jeremy at Conergy does for us). I didn’t check your head and flow, but I
would expect that’s about your only good pump choice at that head. Add a
tracker if you need greater summer output; don’t attempt batteries as a
solution. If usage occasionally exceeds output, add an IO101 control and allow the
pump to run off any AC source at night. A tiny 1,200W inverter/generator will
work at sea level. Use a CU200 controller to allow a float or level detector switch
to turn off the pump when tanks are full. Mercury-based float switches last
longer in signal circuits that carry no current. If you can’t use a float
switch because the lines are already buried, look into <a
href="http://www.p2flow.com/">www.P2Flow.com</a> for pressure transducer-based control.
Read the website info, then call Britt there with your specific application.
That array sounds oversized, as the pump draws a maximum of 900 watts. Hope
this helps.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>Allan Sindelar<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><a href="mailto:Allan@positiveenergysolar.com"><font size=2><span
style='font-size:10.0pt'>Allan@positiveenergysolar.com</span></font></a><font
color=black><span style='color:black'><o:p></o:p></span></font></span></font></p>
<p class=MsoNormal><font size=2 color=black face="Times New Roman"><span
style='font-size:10.0pt;color:black'>NABCEP Certified Photovoltaic Installer</span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face="Times New Roman"><span
style='font-size:10.0pt;color:black'>EE98J Journeyman Electrician</span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>Positive Energy, Inc.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>3201 Calle Marie<o:p></o:p></span></font></p>
<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>Santa
Fe</span></font></st1:City><font color=black><span style='color:black'>, <st1:State
w:st="on">New Mexico</st1:State> <st1:PostalCode w:st="on">87507</st1:PostalCode></span></font></st1:place><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>505 424-1112<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><a href="http://www.positiveenergysolar.com"><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>www.positiveenergysolar.com</span></font></a><o:p></o:p></span></font></p>
</div>
<div>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<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>
</div>
<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>
<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>
</div>
<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>
<div>
<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>
</div>
<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>
<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>
</div>
<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>
<div>
<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>
</div>
<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>
</div>
<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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