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We have been having excellent results with the Monoflo line of solar
pumps. Even though this company has been producing progressive-cavity
PV pumps since the 80's in Australia, and their use is so prevelant in
many parts of the world that pumps in general are called "Monos", they
have only begun being marketed here relatively recently. On the down
side, the highest head currently available is 500', so very high heads
are out. Also, they can't accept the multiple types of input that
Grundfos can. On the other hand, they produce more water per Watt than
other solar pumps, have a bulit-in pressure shut off with timed
hysteresis (eliminating external pressure switches, relays, timers,
etc), can be adjusted at the controller to reduce flow in wells that
lose recovery during dry months and, if you happen to have a ranch the
size of Montana, you can monitor pump performance remotely from a
computer. Also, the "CASS" pumps sizing system is extremely accurate
and useful. Please not that we sell many types of pumps and I am not
suggesting buying these pumps but, for wrenches that do a lot of solar
pump work, they do merit looking into.<br>
<br>
Matt T<br>
<br>
Allan Sindelar wrote:
<blockquote cite="mid013001c9ecba$23adba70$6401a8c0@pelapallan"
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<div class="Section1">
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: black;">I agree with
Brian and Mark on most of
their comments, but here’s a bit more:<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: black;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: black;">Mark is right,
there’s no way to separately
control filling two tanks at different levels. I didn’t read that
section
very carefully. Brian’s float valve approach and sequential filling is
about the only approach. But given that a float valve failure could be
catastrophic
(5,000 gallons flowing back down) you might want to add a check valve
on the
line to the higher tank, if the line from the well to the two tanks is
shared.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: black;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: black;">Remember, too,
that the total dynamic head
is measured from the water level in the well, not the pump level. That
means
your tdh on the far well is something less than 220’, or about 97 psi
(plus friction head). Assuming you don’t have 3,000 feet of signal
cable
in the ground, the P2Flow approach would likely work well. Their
0-100psi
transducer has a resolution of 0.1 psi. Make sure to add a check valve
where
the line leaves the well, so as to be unaffected by fluctuations of the
water
level in the well, and put the pressure-sensing transducer after the
check
valve, so that it only measures head determined by the tank level.
We’re
working with a similar application here in <st1:State w:st="on"><st1:place
w:st="on">New Mexico</st1:place></st1:State>, so I’m learning this too.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: black;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: black;">One respectful
disagreement with Mark: The
3SQF-3 Grundfos is officially rated to 656’. I hear it will do well
more
than that, but no direct experience. I would not recommend the Lorentz
after
multiple failures back when Dankoff (now Conergy) was the sole North
American
distributor. (We are in <st1:City w:st="on"><st1:place w:st="on">Santa
Fe</st1:place></st1:City>
so do will call pickups for most orders. Don’t ask me to describe
seeing
pallets of junk Lorentz pumps outside their warehouse, waiting to head
to the
recycler.)<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: black;"><o:p> </o:p></span></font></p>
<div>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: black;">Allan Sindelar<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="2"><span style="font-size: 10pt; color: black;"><a
href="mailto:Allan@positiveenergysolar.com">Allan@positiveenergysolar.com</a></span></font><font
color="black"><span style="color: black;"><o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="2"><span style="font-size: 10pt; 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 color="black" face="Times New Roman"
size="2"><span style="font-size: 10pt; 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 color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: black;">Positive Energy,
Inc.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; 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
color="black" face="Times New Roman" size="3"><span
style="font-size: 12pt; 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 color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: black;">505 424-1112<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: black;"><a
href="http://www.positiveenergysolar.com">www.positiveenergysolar.com</a></span></font><o:p></o:p></p>
</div>
<div>
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face="Times New Roman" size="3"><span style="font-size: 12pt;">
<hr tabindex="-1" align="center" size="2" width="100%"></span></font></div>
<p class="MsoNormal"><b><font face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">From:</span></font></b><font
face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma;">
<a class="moz-txt-link-abbreviated" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>]
<b><span style="font-weight: bold;">On Behalf Of </span></b>Brian
Teitelbaum<br>
<b><span style="font-weight: bold;">Sent:</span></b> Friday, June 12,
2009 2:18
AM<br>
<b><span style="font-weight: bold;">To:</span></b> RE-wrenches<br>
<b><span style="font-weight: bold;">Subject:</span></b> Re:
[RE-wrenches] Design
help for solar water pumping application</span></font><o:p></o:p></p>
</div>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">Hi
Lee,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">I
don’t know
how the two tanks are laid out physically, but if they happen to be
installed
in a way that you could run one pipeline up to the tank at 200’ and go
from there to the other tank, you might try using a float valve in the
lower
tank and a float switch in the upper tank. The lower tank’s inlet would
just be “teed” off of the pipeline going to the upper tank. The
lower tank will fill first, being the path of least resistance. When it
is
full, the float valve closes sending water through the pipeline to the
upper
tank. When the upper tank is full, the float switch would turn the pump
off.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">The
distance to the
float switch in the upper tank is a bit far, but you should be OK if
you use a
larger gauge wire than usual. I think that 18 gauge would be fine, but
16 gauge
would be better. If it is line-of-site, you might look into doing a
wireless
control , but that would mean that you need a small PV module and a
battery up
there.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">Go
with the 1
½” pipe<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">Not
to contradict
Mark (Ok…I guess that I am!) The Grundfos model 3 SQF-3 will do
600’<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">As
to Allen’s
comment about array size, he is correct about the pump drawing a max of
900W.
However, if you only put a 900W array on the pump, it will only pump at
max
volume at mid-day. If you put a larger array on the pump, the array
will
produce 900W in less light (morning and afternoon) and produce a lot
more
gallons per day (GPD). The GPM figure of a solar pump is really only
relevant
for making sure that you don’t over pump a low yielding well. It’s
really GPD that counts. That 1.36kW array might produce 900W at 9AM and
3PM,
giving you a solid six hours of max output pumping. No problem over
sizing the
array – the pump will only draw what it needs. If you have really good
exposure to the sky, you can use a tracker to increase GPD instead of
over
sizing the PV.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">According
to my
info, with 250” of head (220’ plus pipe friction loss) you can get
about 2000 GPD (summer) with the Grundfos model 6 SQF-2 and about 700W
of PV in
a fixed array, with a peak flow of 4.5 GPM. Adding more PV will give
you more
GPD. With the model 11 SQF-2, you can get up to about 4300 GPD with a
1750W
array at that head. If you needed even more water volume, and the well
produced
it, you could even put two pumps in the well (with separate arrays). I
had one
dealer who managed to put two Grundfos pumps down a 5” casing! He said
that it all went easy….but I don’t believe him. He did have a
curious issue though. He said that if he turned one pump off with its
CU200,
both pumps would shut down, even though the other pump was not
connected to
that CU200. He couldn’t just run one pump. I never did talk to Grundfos
about that.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">Cheers!<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">Brian
Teitelbaum<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);">AEE
Solar<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="#1f497d" face="Calibri" size="2"><span
style="font-size: 11pt; font-family: Calibri; color: rgb(31, 73, 125);"><o:p> </o:p></span></font></p>
<div>
<div
style="border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><font face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">From:</span></font></b><font
face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma;">
<a class="moz-txt-link-abbreviated" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>]
<b><span style="font-weight: bold;">On Behalf Of </span></b>Mark
Dickson<br>
<b><span style="font-weight: bold;">Sent:</span></b> Thursday, June
11, 2009 9:40
PM<br>
<b><span style="font-weight: bold;">To:</span></b> 'RE-wrenches'<br>
<b><span style="font-weight: bold;">Subject:</span></b> Re:
[RE-wrenches] Design
help for solar water pumping application<o:p></o:p></span></font></p>
</div>
</div>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">Hey Lee, <o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">Allan is
right in that the WINcaps software
is a lifesaver and FREE! Not to contradict Allan, but I do not see a
feasible way of using two float switches in separate tanks with only
one pump
controller. Also, the 3000’ distance is a little far—they
usually recommend a max distance of 1600’ for the float switches.
Lastly, if you are ever worried about the head, the Lorentz pumps can
pump up to 760’ --more than double the recommended for Grundfos. <o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">I highly
recommend Genpro Energy Solutions
as a pump distributor for both of those brands. They always answer the
phone, are personable and return emails (hint, hint Conergy)!<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">Best, <o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<div>
<p class="MsoNormal"><font color="navy" face="Comic Sans MS" size="2"><span
style="font-size: 10pt; 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 color="navy" face="Comic Sans MS" size="2"><span
style="font-size: 10pt; 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 color="navy" face="Comic Sans MS" size="2"><span
style="font-size: 10pt; font-family: "Comic Sans MS"; color: navy;"><a
href="http://www.oasismontana.com/" target="_blank"><font
color="#497699"><span style="color: rgb(73, 118, 153);">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 color="navy" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: navy;"> <o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="#497699" face="Comic Sans MS"
size="2"><span
style="font-size: 10pt; font-family: "Comic Sans MS"; color: rgb(73, 118, 153);"><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 color="navy" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: navy;"> <o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Comic Sans MS" size="2"><span
style="font-size: 10pt; font-family: "Comic Sans MS"; color: navy;"><a
href="http://www.pvsolarpumps.com/" target="_blank"><font
color="#497699"><span style="color: rgb(73, 118, 153);">www.PVsolarpumps.com</span></font></a>
</span></font><o:p></o:p></p>
</div>
<div>
<div class="MsoNormal" style="text-align: center;" align="center"><font
face="Times New Roman" size="3"><span style="font-size: 12pt;">
<hr align="center" size="2" width="100%"></span></font></div>
<p class="MsoNormal"><b><font face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">From:</span></font></b><font
face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma;">
<a class="moz-txt-link-abbreviated" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b><span
style="font-weight: bold;">On Behalf Of </span></b>Allan Sindelar<br>
<b><span style="font-weight: bold;">Sent:</span></b> Thursday, June
11, 2009 2:28
PM<br>
<b><span style="font-weight: bold;">To:</span></b> 'RE-wrenches'<br>
<b><span style="font-weight: bold;">Subject:</span></b> Re:
[RE-wrenches] Design
help for solar water pumping application</span></font><o:p></o:p></p>
</div>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: black;">Lee,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; 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 color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: black;"><o:p> </o:p></span></font></p>
<div>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: black;">Allan Sindelar<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"><a href="mailto:Allan@positiveenergysolar.com"><font
size="2"><span style="font-size: 10pt;">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 color="black" face="Times New Roman"
size="2"><span style="font-size: 10pt; 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 color="black" face="Times New Roman"
size="2"><span style="font-size: 10pt; 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 color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: black;">Positive Energy,
Inc.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; 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
color="black" face="Times New Roman" size="3"><span
style="font-size: 12pt; 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 color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt; color: black;">505 424-1112<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"><a href="http://www.positiveenergysolar.com"><font
face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">www.positiveenergysolar.com</span></font></a><o:p></o:p></span></font></p>
</div>
<div>
<div class="MsoNormal" style="text-align: center;" align="center"><font
face="Times New Roman" size="3"><span style="font-size: 12pt;">
<hr align="center" size="2" width="100%"></span></font></div>
<p class="MsoNormal"><b><font face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">From:</span></font></b><font
face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma;">
<a class="moz-txt-link-abbreviated" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <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>
<a class="moz-txt-link-abbreviated" href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><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 face="Times New Roman" size="3"><span
style="font-size: 12pt;"><o:p> </o:p></span></font></p>
<div>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;">Solar Water Pumping Wrenches,<o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"> <o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;">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 face="Times New Roman" size="3"><span
style="font-size: 12pt;"> <o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;">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 face="Times New Roman" size="3"><span
style="font-size: 12pt;"> <o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;">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 face="Times New Roman" size="3"><span
style="font-size: 12pt;"> <o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;">Thanks!<br clear="all">
Lee<o:p></o:p></span></font></p>
</div>
</div>
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