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Kirpal,<br>
For the occasional odd high-current DC contactor, I like MDI. They made
the mercury displacement contactors used years ago in the Ananda/APT
Powercenters. Check out <a class="moz-txt-link-freetext" href="http://www.mdius.com/relays.php#High_Voltage">http://www.mdius.com/relays.php#High_Voltage</a> to
see if they have anything you can use.<br>
Allan<br>
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<div class="Section1">
<p class="MsoNormal" style=""><span class="il"><b style="">Allan</b></span><b
style=""> Sindelar</b><span style="font-size: 10pt;"><br>
<a href="mailto:Allan@positiveenergysolar.com" target="_blank"><span
class="il">Allan</span>@positiveenergysolar.com</a><br>
NABCEP Certified Photovoltaic Installer<br>
EE98J Journeyman Electrician<br>
<b style="">Positive Energy, Inc.</b><br>
3201 Calle Marie<br>
Santa Fe, New Mexico 87507<br>
<b style="">505 424-1112</b><br>
<a href="http://www.positiveenergysolar.com/" target="_blank">www.positiveenergysolar.com</a></span></p>
</div>
</div>
<br>
<br>
Kirpal Khalsa wrote:
<blockquote
cite="mid:AANLkTikizzz4io4I1prGghIKGEQgBIdiP3cG1A55Nhq6@mail.gmail.com"
type="cite">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 moz-do-not-send="true" href="http://www.oregonsolarworks.com">www.oregonsolarworks.com</a><br>
541-218-0201 m<br>
541-592-3958 o<br>
<br>
<div class="gmail_quote">On Mon, May 24, 2010 at 2:42 PM, Mark
Dickson <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:Mark@oasismontana.com">Mark@oasismontana.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div bgcolor="white" link="blue" vlink="blue" lang="EN-US">
<div>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">Allan, </span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; 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></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"> </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
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></font><font
color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"></span></font></p>
<div class="im">
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<div>
<p><font color="navy" face="Comic Sans MS" size="2"><span
style="font-size: 10pt; font-family: "Comic Sans MS"; color: navy;">Best
regards,</span></font></p>
<p><font color="navy" face="Comic Sans MS" size="2"><span
style="font-size: 10pt; font-family: "Comic Sans MS"; color: navy;"> </span></font></p>
<p><font color="navy" face="Comic Sans MS" size="2"><span
style="font-size: 10pt; font-family: "Comic Sans MS"; color: navy;">Mark
</span></font><font color="navy" face="Comic Sans MS" size="2"><span
style="font-size: 10pt; font-family: "Comic Sans MS"; color: navy;">Dickson,</span></font><font
color="navy"><span style="color: navy;"></span></font></p>
<p><font color="navy" face="ArialMT" size="2"><span
style="font-size: 10pt; font-family: ArialMT; color: navy;">NABCEP
Certified Solar
PV Installer ™</span></font></p>
<p><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></p>
</div>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
</div>
<div>
<div class="MsoNormal" style="text-align: center;" align="center"><font
color="black" face="Times New Roman" size="3"><span
style="font-size: 12pt; color: windowtext;">
<hr align="center" size="2" width="100%"></span></font></div>
<p class="MsoNormal"><b><font color="black" face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma; color: windowtext; font-weight: bold;">From:</span></font></b><font
color="black" face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma; color: windowtext;"> <a
moz-do-not-send="true"
href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>
[mailto:<a moz-do-not-send="true"
href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">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> Monday, May
24, 2010 2:39 PM
<div>
<div class="h5"><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]
Grundfos SQ FLEX AC/DC auto switching</div>
</div>
</span></font><font color="black"><span style="color: windowtext;"></span></font></p>
</div>
<div>
<div class="h5">
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;"> </span></font></p>
<p class="MsoNormal" style="margin-bottom: 12pt;"><font
color="black" face="Times New Roman" size="3"><span
style="font-size: 12pt;">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></font></p>
<div>
<p class="MsoNormal"><span><b><font color="black"
face="Times New Roman" size="3"><span
style="font-size: 12pt; font-weight: bold;">Allan</span></font></b></span><b><span
style="font-weight: bold;"> Sindelar</span></b><font size="2"><span
style="font-size: 10pt;"><br>
<a moz-do-not-send="true"
href="mailto:Allan@positiveenergysolar.com" target="_blank"><span>Allan</span>@positiveenergysolar.com</a><br>
NABCEP Certified Photovoltaic Installer<br>
EE98J Journeyman Electrician<br>
<b><span style="font-weight: bold;">Positive Energy, Inc.</span></b><br>
3201 Calle Marie<br>
Santa Fe, New Mexico 87507<br>
<b><span style="font-weight: bold;">505 424-1112</span></b><br>
<a moz-do-not-send="true" href="http://www.positiveenergysolar.com/"
target="_blank">www.positiveenergysolar.com</a></span></font></p>
</div>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;"><br>
<br>
Mark Dickson wrote: </span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; 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></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<div>
<p><font color="navy" face="Comic Sans MS" size="2"><span
style="font-size: 10pt; font-family: "Comic Sans MS"; color: navy;">Best
regards,</span></font></p>
<p><font color="navy" face="Comic Sans MS" size="2"><span
style="font-size: 10pt; font-family: "Comic Sans MS"; color: navy;"> </span></font></p>
<p><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></p>
<p><font color="navy" face="ArialMT" size="2"><span
style="font-size: 10pt; font-family: ArialMT; color: navy;">NABCEP
Certified Solar PV
Installer ™</span></font></p>
<p><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></p>
<br>
</div>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;"></span></font><br>
</p>
</div>
</div>
</div>
</div>
</blockquote>
</div>
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