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Adding to James' post about Grundfos SQ pumps:<br>
<br>
The 1/2 HP models (only) are available in 115V as well as 230V. The
5SQ05-180 pumps around 5-6 gpm at up to about 300' of TDH, or 200'
plus pressurizing in a single-pump installation. This makes it an
ideal replacement in certain situations where existing 24V DC pumps
have failed or wells have dropped and inverted AC is available, but
only 120V, such as Outback FX and old Trace SW. It's soft-start, so
there's no surge and no flickering lights. <br>
<br>
I have used this solution several times successfully, and just
installed one in place of a failed Lorentz running at 24V. <br>
<br>
This pump can also safely be laid horizontally in a storage tank and
used as a pressurizing pump. Both the 5SQ05-140 and the 5SQ05-180
will work in this application, controlled by a standard pressure
switch. I will generally mount the pump in a sleeve (also offered by
Grundfos), with spacers to keep the pump off of the tank bottom.
This is a good approach for rainwater catchment, as the pump will
tolerate some sediment, unlike some better surface pressurizing
pumps.<br>
Allan<br>
<br>
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<p class="MsoNormal"><b>Allan Sindelar</b><br>
<span style="font-size:10.0pt"><a
href="mailto:allan@sindelarsolar.com">allan@sindelarsolar.com</a></span><br>
<span style="font-size:10.0pt">NABCEP Certified PV
Installation Professional<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder (Retired), <span style="mso-bidi-font-weight:bold">Positive
Energy,
Inc.</span><br>
<b>505 780-2738 cell</b><br
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<div class="moz-cite-prefix">On 4/10/2015 11:52 AM, James Jefferson
Jarvis wrote:<br>
</div>
<blockquote cite="mid:55280DF6.6010509@aprsworld.com" type="cite">The
SQ is not just a simple AC motor. It has the soft start and pretty
much all of the same features as the SQE, besides the variable
speed that makes the constant pressure work well.
<br>
<br>
<a class="moz-txt-link-freetext" href="http://www.grundfos.com/products/find-product/sq.html">http://www.grundfos.com/products/find-product/sq.html</a>
<br>
<br>
I use SQ on my own two wells. Both run perfectly on Magnum
MS4024PAE (single inverter). Both are around 300 ft deep with
~100' static water level. Use 3/4 HP in one and 1 HP in the other.
No starting surges. Can't even tell it is running. Can run 12 AWG
wire out and down the well and voltage drop won't cause them to
run any slower.
<br>
<br>
-James Jarvis
<br>
APRS World, LLC
<br>
<a class="moz-txt-link-freetext" href="http://www.aprsworld.com">http://www.aprsworld.com</a>
<br>
<br>
On 4/10/2015 12:30 PM, Ray Walters wrote:
<br>
<blockquote type="cite">I think you've started a good rundown of
the three pump lines, I believe
<br>
they all use the same basic multistage pump head. The SQ line
has just
<br>
a simple AC motor; no constant pressure, and the usual starting
surge
<br>
associated with regular AC submersibles.
<br>
<br>
R.Ray Walters
<br>
CTO, Solarray, Inc
<br>
Nabcep Certified PV Installer,
<br>
Licensed Master Electrician
<br>
Solar Design Engineer
<br>
303 505-8760
<br>
<br>
On 4/10/2015 11:25 AM, Howie Michaelson wrote:
<br>
<blockquote type="cite">Thanks everyone for the feedback - as
always the best source of hands on
<br>
info anywhere!
<br>
<br>
So as I understand it, the 2 basic choices are the SQ,SQE line
or the
<br>
SQFlex line.
<br>
Advantages of the SQE are:
<br>
* cheaper
<br>
* Constant pressure
<br>
Advantages of the SQFlex are:
<br>
* More efficient (how much?)
<br>
* Can run on AC or DC
<br>
<br>
Both are soft start, and both can run without the controller.
No
<br>
controller looses the display readout and a couple other
smaller bells
<br>
and
<br>
whistles, but otherwise no operational change. I haven't be
able to
<br>
determine the difference between the SQ & SQE lines. Are
there any
<br>
durability differences between the SQ, SQE, and SQF lines?
<br>
<br>
Howie
<br>
</blockquote>
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