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<pre wrap="">Dear Mac,
I do not believe you will find an efficient AC option because you only need a low pumping rate, and that is only efficiently served by a positive displacement pump. I would look further into the field of maintenance-free brushless helical rotor submersibles. These include Grundfos SQF, Lorentz distributed by GenPro (now nationwide), and some new offings from SunRotor.
Grundfos has the advantage of accepting AC or DC. Lorentz can do same with a converter option.
When there is excess energy at the main system, that can divert power to the pump, using a relay controlled by battery voltage (set up through any of the various controllers or inverters that now provide those functions). See the previous issue of Home Power that had a fine article on diversion controls.
Compare cost estimates of various options and see what shines.
Windy Dankoff
Founder, retired, Dankoff Solar Products, Inc.
Spin-offs: Positive Energy Solar <> Conergy USA,
Dankoff Solar Pumps (Div. Solar Power & Pump Co.)
Co-author, book in progress:
Solar Water Pumping (Taylor & Francis, Earthscan Expert Series)
---------------------------------
Note: I sent Mac's question to Windy and am posting his reply for him.
</pre>
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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 5/5/2015 8:36 AM, Mac Lewis wrote:<br>
</div>
<blockquote
cite="mid:CAOABG48V86GEd-km_jo6MBmyNyCvM7vRNxSRVJ0JgY-DOPBdwg@mail.gmail.com"
type="cite">
<div dir="ltr">Hello wrenches,
<div><br>
</div>
<div>I've got an off-grid pumping application question. The
scenario is 400' of head, with needs of about 1400-2500
gallons per day. We are trying to pump from a low pond on the
property to a high pond on the property, for pressurized water
delivery all over the property. I can do a solar direct pump
quite easily and serve this need. However, I'm also
interested in efficient AC pumping options. </div>
<div><br>
</div>
<div>He is currently undergoing an remodel and considering
upgrading his off-grid equipment and bulking up his system.
It may make sense to do an efficient AC pump and put the money
saved by going with an AC pump, into his off grid system
upgrade.</div>
<div><br>
</div>
<div>What are some pumps worth looking at for this application?
</div>
<div>Does anyone know the efficiency of an SQFlex pump operated
in AC mode? I can't find it in the literature.</div>
<div><br>
</div>
<div>Thanks in advance</div>
<div>
<div>-- <br>
</div>
<div class="gmail_signature">
<div>Mac Lewis<br>
</div>
</div>
</div>
</div>
</blockquote>
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