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Howie,<br>
I believe that the SQE has the constant-pressure capability, and the
SQ doesn't. I have never used it in that manner, due to the idle
load. Either can be used with a pressure switch.<br>
<br>
Ray, both are soft-start AC. From the manual:<br>
<blockquote>Features and benefits<br>
SQ, SQE pumps offer these features:<br>
• Dry-run protection<br>
• high efficiency pump and motor<br>
• protection against up-thrust<br>
• soft-start<br>
• over-voltage and under-voltage protection<br>
• over-temperature protection<br>
• high starting torque.<br>
Additionally, SQE pumps offer these advantages:<br>
• Constant pressure control<br>
• variable speed<br>
• electronic control and communication.<br>
</blockquote>
The SQFlex can run at either 120V or 240V AC. The SQ and SQE are
available in 120V only in 1/2 HP models, I think; 3/4 HP and up are
all 240V AC. That may make a difference, depending on your inverter.<br>
<br>
The CU200 offers a float switch control, which is sometimes
necessary. Otherwise AC or DC control must be separate on the input.
Also, my understanding is that for a period of time some years ago
there were bad CU200s, but the issue was corrected.<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 11:25 AM, Howie Michaelson
wrote:<br>
</div>
<blockquote
cite="mid:52528.73.167.49.246.1428686715.squirrel@mail4.atypica.com"
type="cite">
<pre wrap="">Thanks everyone for the feedback - as always the best source of hands on
info anywhere!
So as I understand it, the 2 basic choices are the SQ,SQE line or the
SQFlex line.
Advantages of the SQE are:
* cheaper
* Constant pressure
Advantages of the SQFlex are:
* More efficient (how much?)
* Can run on AC or DC
Both are soft start, and both can run without the controller. No
controller looses the display readout and a couple other smaller bells and
whistles, but otherwise no operational change. I haven't be able to
determine the difference between the SQ & SQE lines. Are there any
durability differences between the SQ, SQE, and SQF lines?
Howie
</pre>
</blockquote>
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