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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Kirpal,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The IOTA ITS-30R automatic transfer switch has two 30A DPDT
relays in it. You could use one relay with the 200VDC positive line wired in
series across the two poles of the NC terminals, and the 240VAC hot lines on
the NO terminals. The second relay could have the DC negative line in series
between the two NC poles, and the AC neutral on the NO pole. That way, the DC
circuit would have four breaks in it when disconnecting, which I imagine would
be enough to break the circuit and extinguish the arcs at 200VDC. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The grid AC would hold the NO poles closed, but during a grid
failure, it would automatically switch to the PV array. If you want to always
run off of PV during the day, you could put a timer in the AC line and only
turn o the AC at night.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I don’t know what an inspector would say about all this
(live 200VDC and 240VAC in one box?), but I think that it would work. It would
at least be an interesting experiment, and not very expensive.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Brian Teitelbaum<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>AEE Solar<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Kirpal
Khalsa<br>
<b>Sent:</b> Tuesday, May 25, 2010 4:07 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Grundfos SQ FLEX AC/DC auto switching<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>Hi All....thanks for the good
feedback on this water pumping system. Many good ideas....It looks like
this is a system which can be done. I will be looking for a relay that
will have the necessary voltage characteristics which will have ~200VDC on one
side being normally closed and 240VAC on the other side, normally open. <br>
Mark, Allan.....I am looking at the Grundfos SQFlex Battery Back up system
brochure and it shows a SQFlex system running with a pressure tank in their
example system. Additionally they brochure goes on to say that "the
CU 200 Controller has terminals for a pressure switch, which will control the
pump's on/off operation via the pressure in the storage tank. The
pressure switch should be of a normally open configuration, where the
contacts within the switch are in the open position when the pressure is below
the maximum set-point. When the pressure in the system rises to the
maximum desired pressure, the contacts will close signaling the pump to shut
off." In researching further it looks like the float terminals in
the CU 200 controller are able to be used for either a float switch or pressure
switch. <br>
I don't have any experience running a pressure tank in line with the output of
the system but I can't see why as Allan pointed out that it would know the
difference between 40PSI in a pressure tank or an additional 100' of
head. I think that it is important to recognize the additional head ( due
to the pressure tank) that will be present and to take that into consideration
when sizing the array for the desired amount of gpm production.<br>
If anyone has any recommendations for a relay or other switch which can handle
200VDC and 240VAC I would be grateful.....<br>
Cheers,<br>
-- <br>
Sunny Regards,<br>
Kirpal Khalsa<br>
NABCEP Certified Solar PV Installer<br>
Renewable Energy Systems<br>
<a href="http://www.oregonsolarworks.com">www.oregonsolarworks.com</a><br>
541-218-0201 m<br>
541-592-3958 o<o:p></o:p></p>
<div>
<p class=MsoNormal>On Mon, May 24, 2010 at 2:42 PM, Mark Dickson <<a
href="mailto:Mark@oasismontana.com">Mark@oasismontana.com</a>> wrote:<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Allan, </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>This is
all Dwight at Genpro could tell me. . .sorry to be vague! I agree, it
seems like it would not know the difference. </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I
would love to shed some light, however this was shared with us at the NGWA show
by a Grundfos Engineer. It has brochursomething to do with the thrust
load bearing on a them. Lorentz has two I believe Grundfos has one.</span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> </span><o:p></o:p></p>
<div>
<p><span style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'>Best
regards,</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'>Mark
Dickson,</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"ArialMT","serif";color:navy'>NABCEP
Certified Solar PV Installer ™</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'>Oasis
Montana Inc.</span><o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> </span><o:p></o:p></p>
</div>
<div>
<div class=MsoNormal align=center style='text-align:center'>
<hr size=2 width="100%" align=center>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <a
href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>
[mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org"
target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Allan
Sindelar<br>
<b>Sent:</b> Monday, May 24, 2010 2:39 PM<o:p></o:p></span></p>
<div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Grundfos SQ FLEX AC/DC auto switching<o:p></o:p></span></p>
</div>
</div>
</div>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='color:black'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><span
style='color:black'>Mark,<br>
Your message gave me pause, as I just last week specified this setup, so I
checked into it with our Grundfos rep. He said he had never heard anything
recommending against the flex in a pressure system. He said the SQF doesn't
know the difference between 40 psi and 100' of head. At the end of the day the
pump just stops. <br>
<br>
He did make a point of emphasizing the need for pressure relief valves, as the
helical rotor models can overpressure a system.<br>
<br>
Could you check with your distributor about this and post the reason you're
given, please?<br>
Allan</span><o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='color:black'>Allan</span> Sindelar</b><span style='font-size:10.0pt'><br>
<a href="mailto:Allan@positiveenergysolar.com" target="_blank">Allan@positiveenergysolar.com</a><br>
NABCEP Certified Photovoltaic Installer<br>
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">www.positiveenergysolar.com</a></span><o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='color:black'><br>
<br>
Mark Dickson wrote: </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Our
Grundfos pump distributor has always warned against using the SQF pumps in
pressure pumping situations. I can’t quite remember why, but you
may want to check into that. The Lorentz HR’s have been the choice
in these situations.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> </span><o:p></o:p></p>
<div>
<p><span style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'>Best
regards,</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'>Mark
Dickson,</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"ArialMT","serif";color:navy'>NABCEP
Certified Solar PV Installer ™</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'>Oasis
Montana Inc.</span><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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