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Mac,<br>
No, I haven't done it, so take this with a grain of salt... <br>
<br>
Here's a simple mechanical approach: have you considered a
dual-action float switch on the PV input to the CU200? Check out SJE
Rhombus at
<a class="moz-txt-link-freetext" href="http://www.sjerhombus.com/products/product_info.asp?id=330">http://www.sjerhombus.com/products/product_info.asp?id=330</a>. This
three-wire mechanical float switch has a common wire, a pump-up and
a pump-down wire. You could wire the PV input to the common, the
pump-up to the CU200 PV input (NOT the float switch terminals), and
the pump-down to the charge controller.<br>
<br>
I see one problem that you might not have considered. The SQF needs
at least 30V to operate, is pretty happy around 65V (4 old 12V
modules), but likes 90-120V best. It will take a pretty expensive
controller, like an FM60, to accept input voltage that high. In in
Haiti's hot climate there's little benefit from MPPT. You might
consider a helical-rotor pump that operates at lower voltage, like a
Sunrotor.<br>
<br>
Allan<br>
<br>
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<font face="Times New Roman, Times, serif"><b>Allan Sindelar</b></font><br>
<small><a href="mailto:Allan@positiveenergysolar.com"><font
color="#000099" face="Times New Roman, Times, serif"><u>Allan@positiveenergysolar.com</u></font></a></small><font
face="Times New Roman, Times, serif"><br>
<span style="font-size: 10pt;">NABCEP Certified Photovoltaic
Installer<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
<b>Positive Energy, Inc.</b><br>
3201 Calle Marie<br>
Santa Fe, New Mexico 87507<br>
<b>505 424-1112</b><br>
<a href="http://www.positiveenergysolar.com/" target="_blank"><u>www.positiveenergysolar.com</u></a><o:p></o:p></span></font>
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style="font-size: 10pt;"><font face="Times New Roman, Times,
serif"><st1:place w:st="on"><st1:city w:st="on"></st1:city><st1:state
w:st="on"></st1:state><st1:postalcode w:st="on"></st1:postalcode></st1:place></font><b
style=""><br>
</b></span></p>
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<br>
On 12/14/2011 8:40 PM, mac Lewis wrote:
<blockquote
cite="mid:CAOABG496PNLK-RUqDF2uv3Uo2qnoDo7=m6T82oxjeGngnt4R9Q@mail.gmail.com"
type="cite">Wrenches, wrenchers and wrenchees,
<div><br>
</div>
<div>I've got a pump control question. Working on a stand-alone
pumping station in Haiti. I am planning on using a Grundfos
SQflex pumping system with a Cu 200 and a float switch. Also
needed on site, is a small pressure pump to force water through
a purification system. This part won't take much power, and the
cistern will sit full most of the time, so I'd like to be able
to take advantage of this. I am thinking that I would like to
figure out a control system that works off of the float switch
that when the float is up, the array leads disconnect from the
pumping system and connect to a charge controller that charges
up some batteries that will be used to power the pressure pump.</div>
<div><br>
</div>
<div>Has anyone designed anything like this? Any ideas on how to
do this? I think I can use an op amp to amplify the 15 mA
signal on the float switch to push a relay, but that may not be
as reliable as it should be.</div>
<div><br>
</div>
<div>Thanks in advance.</div>
<div><br clear="all">
<div>Mac Lewis</div>
-- <br>
<div><br>
</div>
<div><font color="#305a78" face="'times new roman', serif"><br>
</font></div>
<div><br>
</div>
Mac Lewis<br>
<br>
<span style="font-family: 'Times New Roman'; font-size: medium;
color: rgb(255, 153, 0);"><b><font size="3" face="Arial,
Helvetica, sans-serif">
<p align="left"><font color="#000000" face="Verdana,
Arial, Helvetica, sans-serif"><span style="font-size:
small;"><span style="font-family: arial;
font-weight: normal; color: rgb(48, 90, 120);"><font
face="'times new roman', serif">"Yo solo sé que
no sé nada." </font><span style="font-weight:
700; color: rgb(104, 104, 104);"><font
face="'times new roman', serif">-Sócrates</font></span></span></span></font></p>
</font></b></span><br>
</div>
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