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<DIV>The SQ-Flex can run directly from a high voltage battery/PV system, but
with a battery based system at over 60 volts or so, you have a lot of problems
finding a good charge controller.</DIV>
<DIV> </DIV>
<DIV>So, even with the associated losses you are going to get with an inverter
system, that is probably the only good option.</DIV>
<DIV> </DIV>
<DIV>But I would also advise that systems such as that, especially those
involving a large battery capacity, are very highly subject to failure through
mis-operation, poor maintenance, and outright theft in many 3rd world countries,
so if you end up designing the system keep that in mind.</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=solarphil@gmail.com
href="mailto:solarphil@gmail.com">Phil Undercuffler</A> </DIV>
<DIV><B>Sent:</B> Thursday, February 10, 2011 6:59 AM</DIV>
<DIV><B>To:</B> <A title=re-wrenches@lists.re-wrenches.org
href="mailto:re-wrenches@lists.re-wrenches.org">RE-wrenches</A> </DIV>
<DIV><B>Subject:</B> Re: [RE-wrenches] PV water pumping</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none"><FONT
size=2><FONT face=arial,helvetica,sans-serif>Tom,</FONT></FONT>
<DIV><FONT size=2><FONT face=arial,helvetica,sans-serif><BR></FONT></FONT></DIV>
<DIV><FONT size=2><FONT face=arial,helvetica,sans-serif>It can be done,
depending upon how deep the static water level is and what additional lift or
pressurization needs to be overcome. </FONT></FONT></DIV>
<DIV><FONT size=2><FONT face=arial,helvetica,sans-serif><BR></FONT></FONT></DIV>
<DIV><FONT size=2><FONT face=arial,helvetica,sans-serif>The SQ-Flex will run at
highest capacity off an AC source, so I'd consider using an inverter system and
grid power, with additional solar designed to supplement the grid.
</FONT></FONT><SPAN style="FONT-FAMILY: arial, helvetica, sans-serif"
class=Apple-style-span>You can run the SQ-Flex off a 120v source, so a single
inverter works fine. I run my Flex off my FX2024 along with all my regular
household loads, no problems.</SPAN></DIV>
<DIV><FONT size=2><FONT face=arial,helvetica,sans-serif><BR></FONT></FONT></DIV>
<DIV><FONT size=2><FONT face=arial,helvetica,sans-serif>Size the array to cover
the load through the longest expected grid outage (minimum) or you can size the
solar to provide the majority of the power, and use the grid as "bonus" energy
or to cover up for sizing shortages or the inevitable load creep.
</FONT></FONT></DIV>
<DIV><FONT class=Apple-style-span
face="arial, helvetica, sans-serif"><BR></FONT></DIV>
<DIV>Phil Undercuffler
<DIV> </DIV>
<DIV>"imagine if..."<BR>
<DIV>
<DIV><FONT face="arial, sans-serif"><SPAN
style="BORDER-COLLAPSE: collapse"><BR></SPAN></FONT></DIV></DIV></DIV><BR><BR><BR>
<DIV class=gmail_quote>On Thu, Feb 10, 2011 at 5:29 AM, Tom DeBates <SPAN
dir=ltr><<A
href="mailto:habitek83@yahoo.com">habitek83@yahoo.com</A>></SPAN> wrote:<BR>
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<TD vAlign=top>hello Wrenches,<BR> I have an organization in Haiti
that I have assisted with PV projects in the past. They drill public
wells and have a well (4" casing) that they would like to pump with PV.
Problem (one) is that well will draw at ~ 20 gpm and they want ~ 25,000
gpd from the well. I have tried to look at every option I can and it
looks like a battery bank will be necessary and an inverter ( 48 volt
battery bank) to pump at the rate required. OOPPs, forgot they want to
use a Grundfos SQ Flex pump, 16-SQF-10. The gird is "present".....very
erratic and stressed, of course. They really would not like to stress
gird further and do not want to add a generator. Yep, they made this
easy. There are more details, but has anyone designed a PV water pumping
system under these constraints and, if so, what have been your
results?<BR>thanks,<BR>tom<BR><BR>Tom DeBates<BR>Habi-Tek<BR>524 Summit
St.<BR>Geneva,IL. 60134<BR>630-262-8193<BR>fax
630-262-1343</TD></TR></TBODY></TABLE><BR><BR>_______________________________________________<BR>List
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